Artykuły w czasopismach: „Aluminium Granulaire”

1

Wang, Kai, Shengqing Hu, Tianhao Wang, Wenlong Xie, Tong Guo, Fuguo Li i Rong Luo. "Microstructural Evolution and Mechanical Properties of 7075 Aluminium Alloy during Semi-Solid Compression Deformation". Crystals 12, nr 8 (10.08.2022): 1119. http://dx.doi.org/10.3390/cryst12081119.

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Aluminium alloys are becoming increasingly popular due to the demands for high-performance lightweight components, and semi-solid metal processing (SSM) is a technique for forming near-net-shape and complex components with far fewer defects associated with turbulent filling. The deformation mechanisms of semi-solid 7075 aluminium alloy were studied through the direct partial re-melting method using as-extruded billets. It is found that inter-granular and intra-granular deformation occur simultaneously during compression under the semi-solid condition; the deformation of solid primary α-Al grains can compensate for the shrinkage of inter-granular liquid and increase the integrity of shaped parts. The intra-granular deformation at the final stage of SSM can change the morphology of spherical solid grains and induces sub-grain boundaries.

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Zharov, M. V. "Analysis of technological processes of production of spherical powders and granules of NiAl nickel monoaluminide for the needs of domestic engine building". Voprosy Materialovedeniya, nr 3(111) (31.10.2022): 29–40. http://dx.doi.org/10.22349/1994-6716-2022-111-3-29-40.

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The article is devoted to the study of the features of various methods for obtaining granules of nickel aluminide NiAl. The problems hindering the widespread use of nickel aluminide NiAl in modern aircraft and engine construction are analyzed. It has been revealed that the main problems hindering the widespread industrial use of nickel aluminide NiAl are practically zero plasticity of the material during pressure treatment and difficulties in machining parts made of this material. However, this problem can be solved with the use of pellet metallurgy technologies, when by sintering the granular material, an almost finished product is obtained that requires minimal amounts of subsequent machining. Within the framework of the conducted studies, the quality criteria of the obtained granules were determined, which include the sphericity of the granules, the stability of the obtained dimensions of the granular material, the absence of defects in the form of pores, the absence of satellites on the surface of the granules, the presence of a finely dispersed dendritic structure of the granule material. Several methods of obtaining granules of nickel aluminide NiAl have been investigated from the point of view of obtaining the highest quality raw materials, namely: the method of spraying the melted billet with a high-temperature inert gas flow (gas atomization method), the method of centrifugal spraying of the melted electrode (PREP method), the method of centrifugation of the melt using a perforated crucible. It is determined that the optimal way to obtain a high-quality granulate of NiAl material is the method of centrifugal spraying of the melted electrode. In the course of the conducted research, it was proved that the main parameter of the process of centrifugal spraying of the melted electrode, affecting the quality of the obtained granules, their diameter and the value of the dendritic parameter of the microstructure of the granules, is not so much the current strength I as the rotation speed of the melted electrode n. The optimal values of the electrode rotation speeds are determined, which are n ≈ 15000-16000 revolutions per minute at a current strength I ≈ 1000-1500 A. A technology for obtaining high-quality NiAl material granulate has been developed and tested, which includes operations for obtaining initial NiAl blanks by self-propagating high-temperature synthesis, subsequent remelting of semi-finished products, heat treatment, separation of granules and subsequent granulation by the PREP method.

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Verbovenko, I. M., V. V. Kartashov i V. N. Rychkov. "SYNTHESIS NANOSTRUCTURED ALUMINUM OXIDE GRANULATE". Izvestiya Vuzov. Tsvetnaya Metallurgiya (Proceedings of Higher Schools. Nonferrous Metallurgy), nr 2 (26.02.2015): 30. http://dx.doi.org/10.17073/0021-3438-2014-2-30-34.

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Delahaye, J., i T. Grenet. "Ageing in granular aluminium insulating thin films". Annalen der Physik 521, nr 12 (23.12.2009): 830–35. http://dx.doi.org/10.1002/andp.20095211205.

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Delahaye, J., i T. Grenet. "Ageing in granular aluminium insulating thin films". Annalen der Physik 18, nr 12 (23.12.2009): 830–35. http://dx.doi.org/10.1002/andp.200910379.

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Grenet, T. "Slow conductance relaxation in granular aluminium films". physica status solidi (c) 1, nr 1 (styczeń 2004): 9–12. http://dx.doi.org/10.1002/pssc.200303622.

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Verbovenko, I. M., V. N. Rychkov i V. V. Kartashov. "Synthesis of nanostructured aluminum oxide granulate". Russian Journal of Non-Ferrous Metals 55, nr 3 (maj 2014): 229–33. http://dx.doi.org/10.3103/s106782121403016x.

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Dobierzewska-Mozrzymas, Ewa, Andrzej Radosz i Piotr Biegański. "Optical properties of granular aluminum films". Applied Optics 24, nr 5 (1.03.1985): 727. http://dx.doi.org/10.1364/ao.24.000727.

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Ming, Hu, Ren Xiaoxue, Sun Jianbo, Zhang Yunlong, Teng Chunfeng i Qiao Guang. "Fabrication and microstructural analysis of 3A21/7075 aluminum alloy cladding material based on impact jet solid–liquid compound casting". Composites and Advanced Materials 30 (1.01.2021): 2633366X2093448. http://dx.doi.org/10.1177/2633366x20934485.

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To solve thickness problem for high-strength aluminum alloy used as plastic mold materials and eliminate oxide film on the surface of aluminum alloy, a new compound casting, namely impact jet solid–liquid compound casting, was developed to fabricate 3A21/7075 aluminum alloy cladding material. Then, optical microscope (OM), electron-backscattered diffraction (EBSD) technique, and transmission electron microscope (TEM) together with energy-dispersive spectrometer (EDS) were used to analyze microstructure of 3A21/7075 aluminum alloy cladding material. The OM and EBSD results showed that the 3A21/7075 aluminum alloy cladding material was composed of 3A21 cladding layer, fusion zone (FZ), heat-affected zone, and 7075 matrix. The grain morphology on both sides of FZ had great differences. Moreover, the TEM and EDS results showed that the 3A21 cladding layer showed a bulk phase and lots of fine and dispersed granular phases, while the 7075 matrix appeared undetermined strip phases and amounts of fine and dispersed rod-like phases. Moreover, FZ existed a great deal of fine and dispersed granular phases and rod-like phases. The 3A21/7075 aluminum alloy cladding material could effectively solve the problems mentioned above and the in-depth analysis of microstructures of 3A21/7075 aluminum alloy cladding material was of great importance in terms of engineering value and academic significance.

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Bantu, Albert Kazadi Mukenga. "Characterization of Electrodeposited Cobalt/Copper (Co/Cu) Granular Multilayered Thin Films onto the Anodic Aluminum Oxide (AAO) Substrates". Nanomedicine & Nanotechnology Open Access 8, nr 2 (2023): 1–9. http://dx.doi.org/10.23880/nnoa-16000234.

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Herein, we report on the characterization of a series of cobalt/copper granular thin films alloys electrodeposited onto the previously pre-treated aluminum substrates, at different deposition time. And a systematic study of their structural and magneto-optical properties were investigated. The proper deposition potentials of Co, and Cu were obtained from the cyclic voltammetry method. It was observed that the easy axis direction of magnetization was parallel to the film plane for all films. The X-ray diffraction (XRD) results revealed that all films had a mixture of hexagonal close-packed (hcp) and face centered cubic (fcc) phases. The Scanning electron microscope images (SEM) and atomic force microscopy (AFM) showed some parallelepiped and ellipsoid shaped rods with an averaged dimension about of 600 nm length, 600 nm width and 200 nm thickness for a sample electrodeposited at room temperature. These rods are irregularly arranged. Their irregular arrangement could explain the large d-spacing in the sample at this temperature. The magnetic analysis of the granular thin films alloys showed the saturation magnetization increased and the coercivity decreased as the deposition time increased. These results showed that the changes in magnetic and structural properties of granular cobalt/copper alloys deposits were substantially depending on the variation of deposition time. Therefore, the change of the deposition time was seen to control the properties of the alloys deposits and hence their properties could be modified for desired purpose.

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Barone, Carlo, Hannes Rotzinger, Jan Nicolas Voss, Costantino Mauro, Yannick Schön, Alexey V. Ustinov i Sergio Pagano. "Current-Resistance Effects Inducing Nonlinear Fluctuation Mechanisms in Granular Aluminum Oxide Nanowires". Nanomaterials 10, nr 3 (14.03.2020): 524. http://dx.doi.org/10.3390/nano10030524.

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The unusual superconducting properties of granular aluminum oxide have been recently investigated for application in quantum circuits. However, the intrinsic irregular structure of this material requires a good understanding of the transport mechanisms and, in particular, the effect of disorder, especially when patterned at the nanoscale level. In view of these aspects, electric transport and voltage fluctuations have been investigated on thin-film based granular aluminum oxide nanowires, in the normal state and at temperatures between 8 and 300 K. The nonlinear resistivity and two-level tunneling fluctuators have been observed. Regarding the nature of the noise processes, the experimental findings give a clear indication in favor of a dynamic random resistor network model, rather than the possible existence of a local ordering of magnetic origin. The identification of the charge carrier fluctuations in the normal state of granular aluminum oxide nanowires is very useful for improving the fabrication process and, therefore, reducing the possible sources of decoherence in the superconducting state, where quantum technologies that are based on these nanostructures should work.

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A. B. Kuandykov i P. O. Bykov. ""STUDY OF REFINING OF PRIMARY ALUMINUM FROM IMPURITIES OF NON-FERROUS METALS USING «ACTIVE» GRAIN FILTERS BASED ON BORIAN ACID "". Science and Technology of Kazakhstan, nr 3,2023 (29.09.2023): 203–10. http://dx.doi.org/10.48081/sjmq1144.

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"This article presents the results of comparative experimental studies on the complex two-stage processing of primary aluminum by flux treatment with boric acid (H3BO3) in a ladle with further filtration purification of the melt through granular filters and one-stage filtration purification of primary aluminum through active granular filters with boric acid additives. The research was carried out within the framework of grant funding by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan under the Zhas Galym competition under the IRN АР19175493 project «Development of technology for refining primary aluminum with active surface filters». The research results showed that a complex one-stage technology for cleaning raw aluminum from non-ferrous metal impurities using active filters reduces their content in primary aluminum. Laboratory studies showed a decrease in the content of vanadium by 53.3 %, copper by 19.8 %, magnesium by 49.6 %, manganese by 51.7 % and silicon by 97.1 % in primary aluminum when using the active filter cleaning method. A comparative analysis of aluminum purification methods showed that the issue of using active filters needs further study in order to determine the degree of purification from non-ferrous metal impurities, depending on various parameters of the active filter. Keywords: aluminum, non-ferrous metal impurities, filtration, boric acid, flux, active filter. "

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13

Delahaye, Julien, i Thierry Grenet. "Electrical glassy behavior in granular aluminium thin films". Physica B: Condensed Matter 404, nr 3-4 (marzec 2009): 470–72. http://dx.doi.org/10.1016/j.physb.2008.11.040.

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P. O. Bykov, A. B. Kuandykov, K. Sh. Aryngazin, A. B. Kalieva i V. V. Larichkin. "ENVIRONMENTAL ASPECTS OF PROCESSING GRANULAR FILTERS FOR PRIMARY ALUMINUM REFINING". Science and Technology of Kazakhstan, nr 1,2024 (29.03.2024): 150–58. http://dx.doi.org/10.48081/gonv7323.

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This article presents the results of experimental studies on the involvement in the processing of used filters from ash and slag waste used in the refining of primary aluminum as a filler in the production of concrete for building products. The research was carried out within the framework of grant funding from the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan under the competition «Zhas Galym» under the project IRN AR19175493 «Development of technology for refining primary aluminum with filters with an active surface». The recycling of used grain filters was carried out in three stages: preliminary processing of filter grains to remove aluminum scrap; metallurgical processing of separated aluminum scrap by remelting in an induction crucible furnace and refining using complex technology described by the authors in the work; obtaining a concrete mixture based on crushed waste filter grains, quartz sand and bauxite sludge, screenings from crushing rocks with a fraction of 20–30 mm and Portland cement to obtain samples of construction products. According to the test results, the tensile strength of concrete samples of building products is 20.89–37.75 MPa, depending on the content of Portland cement (from 20 to 40 %) and corresponds to the class of heavy concrete. Keywords: aluminum, granular filter, ash, waste, recycling.

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Wang, Zhen, Shiwen Jiang, Tianze Liu i Chunyan Ban. "The effect of Fe content on crystal phase and mechanical properties of 6061 aluminium alloy". Journal of Physics: Conference Series 2566, nr 1 (1.08.2023): 012025. http://dx.doi.org/10.1088/1742-6596/2566/1/012025.

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Abstract In order to eliminate the adverse effects of impurity element Fe in aluminium alloy, the effects of Fe content on the microstructures and mechanical properties of 6061 aluminium alloy were studied utilizing scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and tensile testing machine. The results show that Fe exists mainly in α-AlFeSi and β-AlFeSi phases. Elemental Fe promotes the generation of fishbone shaped α-AlFeSi phase, while the percentage of needle shaped β-AlFeSi phase gradually decreases. After homogenizing annealing, the Mg2Si phase has been redissolved, and a large amount of Si element exists in the aluminium matrix. With the increase of Fe and Si content, β→α phase transition has been completed, and the fishbone α-AlFeSi phase accumulates at the grain boundary. After the extrusion forming process, the morphology of the α-Al12(MnFe)3Si phase changes from fishbone to granular, and the bulk deposition of α-Al12(MnFe)3Si improves the strength of 6061 aluminium alloy.

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Pascu, Doru Romulus, Dragos Buzdugan i Sorin Dragoi. "Structural and Mechanical Characterization of Hard Layers Obtained by Plasma Jet Thermal Spraying". Advanced Materials Research 814 (wrzesień 2013): 41–48. http://dx.doi.org/10.4028/www.scientific.net/amr.814.41.

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In many countries, in the industrial practice, the hard layers deposition is used to increase the hardness of the components active zones. A viable solution to increase the imposed properties consists in the deposition of amorphous layers by thermal spraying. Ferroalloy powders were deposited by plasma jet thermal spraying on aluminium substrates in order to increase the hardness. By plasma jet thermal spraying of Fe-B, Fe-Ni-B and Fe-Cr-Mn-Mo-W-B-P-Si powders on aluminum supports, have been obtained hard layers having the thickness between 72 μm and 86 μm, and granular structures made from α solid solutions, fine particles of specific oxides and complex particles of Fe-B, Fe-B-Si, Fe-Cr, Fe-W-Mo and Fe-P. The measured hardness had the values between 383 and 391 HV1 for the deposited layers made from powders type Fe-B, the values between 410 and 420 HV1 for the deposited layers made from powders type Fe-Ni-B, and the values between 448 and 475 HV1 for the deposited layers made from powders type Fe-Cr-Mn-Mo-W-B-P-Si. No defects, such as cracks or microcracks, have been observed on the hard layers surfaces deposited by plasma jet thermal spraying.

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Kunchur, M., P. Lindenfeld, W. L. McLean i J. S. Brooks. "Absence of superconductivity in metallic granular aluminum". Physical Review Letters 59, nr 11 (14.09.1987): 1232–35. http://dx.doi.org/10.1103/physrevlett.59.1232.

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Bachar, N., U. S. Pracht, E. Farber, M. Dressel, G. Deutscher i M. Scheffler. "Signatures of Unconventional Superconductivity in Granular Aluminum". Journal of Low Temperature Physics 179, nr 1-2 (28.10.2014): 83–89. http://dx.doi.org/10.1007/s10909-014-1244-z.

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Bykov, Petr O., Almaz B. Kuandykov, Ainagul B. Kaliyeva i Eduard Siemens. "Processing used Aluminium Production Granular Filters to Produce Concrete". Engineering, Technology & Applied Science Research 15, nr 1 (2.02.2025): 19885–90. https://doi.org/10.48084/etasr.9360.

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This article presents the findings of experimental studies on the involvement in the processing of spent filters from ash and slag waste used in the refining of primary aluminum as a filler for concrete production. The processing of spent granular filters was conducted in three stages. The first stage involved the preliminary processing of filter grains to remove aluminum scrap. The second stage entailed the metallurgical processing of separated aluminum scrap through remelting in an induction crucible furnace and subsequent refining. The third stage focused on the production of a concrete mixture comprising crushed spent filter grains, quartz sand, bauxite sludge, screenings of crushed rocks with a fraction of 20 mm–30 mm, and Portland cement. This mixture was used to create samples of building products. The test results indicate that the tensile strength of the concrete samples for building products ranges from 20.89 MPa to 37.75 MPa, depending on the Portland cement content. This strength corresponds to that of heavy concrete.

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Widerøe, Fredrik, i Torgeir Welo. "An Investigation of the Material Flow in a Screw Extruder of Aluminium Using Contrast Material". Key Engineering Materials 504-506 (luty 2012): 475–80. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.475.

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The material flow in a screw extruder of aluminium was investigated. Screw extrusion of aluminium is a new solid state process where granulate aluminium is consolidated and extruded in a single continuous process using a rotating screw as the pressure generating device. Understanding the material flow is vital for predicting the consolidation and welding process thereby making it possible to optimize screw and container design to increase the capacity, ekstrudate quality and process stability. Using a prototype screw extruder, aluminium alloy AA6060 was extruded together with contrast material using different feeding schemes to visualize the material flow. Material left in the extruder was inspected visually, sectioned and etched in NaOH to reveal the interaction between the contrast material and the AA6060. It was found that newly fed contrast material primarily displaced material in the centre of the screw channel and the extrusion chamber hereby revealing the main paths of the material flow. Areas of sticking friction, material dead zones and zones of slow material displacement rate were effectively identified using this method.

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Schäfer, C., Mischa Crumbach i Günter Gottstein. "Modelling Nucleation of Recrystallisation in Aluminium Alloys". Materials Science Forum 550 (lipiec 2007): 85–94. http://dx.doi.org/10.4028/www.scientific.net/msf.550.85.

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The predictions from a grain cluster deformation texture model, GIA, are utilized to study the nucleation texture of recrystallisation of aluminium alloys. In combination with a dislocation based work hardening model, the propensity of specific grains in their granular environment for select nucleation mechanisms is investigated. Quantitative criteria for the nucleation events can be formulated. The results can be fed into a growth model of recrystallisation to predict recrystallisation textures and lend themselves to through-process modelling.

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Song, Qi, Wen Jin Zhang, Ai Ai Zhang i Wei Fang Zhang. "The Research Progress of Aluminum Alloy Corrosion in Marine Atmosphere". Advanced Materials Research 1004-1005 (sierpień 2014): 136–41. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.136.

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It is very important to study on the corrosion of aluminum in marine atmospheric environment, because aluminum alloy structure of weapon equipment usually serves in marine atmospheric environment. On the basis of marine atmospheric environment corrosion features, the paper summarizes the influence of marine atmospheric environment influencing factors (e.g., Relative Humidity, Concentration of cl-, Alternate Drying-Wetting, Rainfall) on corrosion rule and corrosion rate of aluminum alloy, and analyses the mechanism of pitting, inter-granular corrosion and denudation. Then the natural environment exposure test and accelerated test were compared. Finally, the key research direction in the field of aluminum alloy corrosion in marine atmosphere was pointed out.

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Xia, Zhi Lin, Qi Xu i Li Xin Zhao. "The Microstructure of Zinc Oxide Films Prepared by Hydrothermal Method". Advanced Materials Research 306-307 (sierpień 2011): 1238–41. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.1238.

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In the solutions which are prepared by mixing zinc nitrate hexahydrate, strong ammonia and methenamine in water bath at 90 Centigrade, lamellate and granular zinc oxide films have grown on different substrates such as B270 glass, glass based PAA films, pure aluminum foil and aluminum based PAA films. Films microstructures were characterized by scanning electron microscope (SEM). The influences of substrate and pH on the films microstructure were analyzed. Results reflect that: Ammonia plays an important role in the growing competition of grainy crystal; the more concentration of ammonia, the more zinc oxide crystals grow into granular. Because of the high specific area and adsorption capacity, lacunaris zinc oxide films have great application perspective in gas sensor, catalyzed sorption and biochemistry.

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Ignatova, A. M., i M. A. Zemlyanova. "BIOLOGICAL ASSESSMENT OF THE IMPACT OF ALUMINUM OXIDE MICROAND NANOPARTICLES ON THE ORGANISM OF LABORATORY ANIMALS IN CONDITIONS OF ACUTE TOXICITY". Toxicological Review, nr 3 (24.06.2020): 33–40. http://dx.doi.org/10.36946/0869-7922-2020-3-33-40.

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Aluminum oxide nanoparticles widely used in the production are part of many consumer goods, such as pharmaceuticals, food additives etc. The study of the biological hazard of aluminum oxide is of greatest relevance to other aluminum compounds, and the increasing demand for aluminum oxide nanomaterials emphasizes the need to identify specific mechanisms of action of its nanoparticles in comparison with larger micro-sized analogues. It has been found that a specific response from the nervous system to a single intragastric injection of aluminum oxide nanoparticles was a change in the morphometric parameters of the neurons of the granular layer and basket neurons of the molecular layer of the cerebellum of the brain, so the size of the neurons of the granular layer of the cerebellum in rats increases by 1,2 times and the size of the basket neurons of the molecular layer of the cerebellum in rats decreases by 1,1 times relative to similar indicators when exposed to microparticles. In case of intragastric administration of the aluminum oxide nanoparticles, the blood filling of sinusoid spaces of liver tissues, thrombosis progressing without visible compensatory changes, and damage to the nuclei of hepatocytes occur in comparison to an increase in the proportion of sinusoid spaces of liver tissues without a sharp increase in blood accumulations and apoptosis of hepatocytes at the level of 3% specific to the injection of aluminum oxide microparticles. The nature of the liver tissue reaction depends on the total specific surface area of the active particles: when exceeding the value of 80 m2, reactions specific for the action of nanoparticles are manifested.

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Thalmaier, György, Niculina Argentina Sechel, Alexandra Csapai, Catalin Ovidiu Popa, Gabriel Batin, Andras Gábora, Tamas Mankovits i Ioan Vida-Simiti. "Aluminum Perlite Syntactic Foams". Materials 15, nr 15 (8.08.2022): 5446. http://dx.doi.org/10.3390/ma15155446.

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This paper presents the usage of spark plasma sintering (SPS) as a method to obtain aluminum-expanded perlite syntactic foams with high porosity. In the test samples, fine aluminum powder with flaky shape particles was used as matrix material and natural, inorganic, granular, expanded perlite was used as a space holder to ensure high porosity (35–57%) and uniform structure. SPS was used to consolidate the specimens. The structures were characterized by scanning electron microscopy and compression tests. Energy absorption (W~7.49 MJ/m3) and energy absorption efficiency (EW < 90%) were also determined.

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Kovtunov, A. I., D. A. Semistenov, Yu Yu Khokhlov i S. V. Myamin. "The research of the processes of formation of porous non-ferrous metals". Vektor nauki Tol'yattinskogo gosudarstvennogo universiteta, nr 2 (2021): 9–17. http://dx.doi.org/10.18323/2073-5073-2021-2-9-17.

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Foamed metals are promising materials with a unique combination of mechanical and operational properties: low specific gravity, low thermal conductivity, ability to absorb acoustic and electromagnetic vibrations, and the ability to deform under a constant load. Currently, the most used methods for producing foamed aluminum and foamed magnesium are methods based on mixing gas or porophore into molten aluminum and forming a porous structure during the solidification of the aluminum melt. An alternative to this technology is the formation of a porous structure through the use of soluble granules that pre-fill the mold and after impregnating the granules with molten metal and solidifying the castings, they are leached. The work aims to determine the influence of casting modes and the size of granules on the depth of impregnation of granular filling with metal melt during the formation of porous aluminum castings. The authors proposed the technique for calculating the depth of impregnation of granular filling when producing castings of porous non-ferrous metals based on the calculation of melt cooling when moving along the thin-walled channel. The calculations made it possible to determine the depth of impregnation and establish the allowable wall thickness of the casting of porous aluminum, depending on the size of the granules used, the speed of the melt in a form, the mold temperature, and the temperature of molten aluminum. The study identified that to increase the depth of impregnation and obtain porous aluminum castings with thinner walls, it is advisable to increase the diameter of the salt granules and not the temperature and hydrodynamic modes of casting. The authors carried out calculations and identified the influence of the casting regimes and the diameter of the granules on the depth of mold impregnation to obtain porous castings from promising magnesium alloys.

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Huang, Chunfa, Zhiguo Liu i Jianguo Li. "Evolution Behavior of the Surface Oxide Film of Al Alloy Scraps in the Melt". Metals 13, nr 3 (3.03.2023): 510. http://dx.doi.org/10.3390/met13030510.

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The oxide film on the scrap surface is one of the primary sources of oxide inclusions in the aluminum melt. Understanding the evolution of the oxide films in the aluminum melt is an important step for developing efficient recycling technologies and controlling the quality of the product. In the present study, we studied the evolution behavior of the oxide film in the aluminum melt. The oxide films were introduced via aluminum alloy scraps into the melt, and the micro-morphology and composition of the oxide film were analyzed by scanning electron microscope and energy spectrum. Results show that the oxide film on the surface of 1235 alloy foil, A356 alloy turning, and 5083 alloy scalping were broken into small flake oxide film and then transformed into minor granular oxide when the scraps were charged into commercial purity aluminum melt. However, in aluminum alloy melt containing magnesium, the oxide film remained an intact sheet shape up to a certain melt dwelling time.

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Grenet, T. "Symmetrical field effect and slow electron relaxation in granular aluminium". European Physical Journal B - Condensed Matter 32, nr 3 (1.04.2003): 275–78. http://dx.doi.org/10.1140/epjb/e2003-00097-3.

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Delahaye, Julien, i Thierry Grenet. "Screening and conductance relaxations in insulating granular aluminium thin films". Journal of Physics: Conference Series 376 (30.07.2012): 012008. http://dx.doi.org/10.1088/1742-6596/376/1/012008.

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Wilson, T. E. "The fabrication and characterization of granular aluminium/palladium bilayer microbolometers". Measurement Science and Technology 18, nr 7 (19.06.2007): N53—N59. http://dx.doi.org/10.1088/0957-0233/18/7/n04.

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Evergen, T. "Investigations into explosion characteristics of ANFO and granular aluminium mixtures". International Journal of Surface Mining, Reclamation and Environment 7, nr 1 (styczeń 1993): 17–22. http://dx.doi.org/10.1080/09208119308964679.

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Puspitasari, P., R. Fauzan, T. L. Ginta, M. Mustapha i D. Puspitasari. "Morphology of aluminium with nickel addition on sand casting process". Journal of Achievements in Materials and Manufacturing Engineering 1, nr 87 (1.03.2018): 13–17. http://dx.doi.org/10.5604/01.3001.0012.0734.

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Purpose: his research aimed to examine the morphology, elemental changes, and phase in the aluminium cast alloys with variations in nickel addition of 1%, 2% and 3%. Design/methodology/approach: Aluminium 98% was melted in sand casting process. The sand casting process was operated at 7000C and atmospheric pressure. The addition of nickel contain of 92.19% of its element. Specimens consist of 4 pieces Al-Ni with the size of 1 x 1 x 0.5 cm for morphological testing, while for phase identification testing consist of 4 pieces Al-Ni with the size of 1 x 1 x 2 cm. The morphological testing was performed using FEI Inspect S50 Scanning Electron Microscope (SEM) and the phase characterisation was conducted using Nikon ME5 Optical Microscope. Findings: The results showed that the addition of 1% nickel in the aluminium cast product could affect the morphology in granular shape with as similar size, at 2% nickel addition also has granular shape, while at 3% of nickel addition, the morphology of Al-Ni was in elongated shape. Phase identification of Al-Ni cast alloy shows that there were Al matrix with nickel that spread in grain boundary of Al. By increasing the percentage of nickel, it shows that the nickel dominated the grain boundary of Al. These results shows that Al-Ni alloy can be produced at simple route on sand casting process. Research limitations/implications: Sand casting process with 80% silica sand, 10% bentonite, 5% water. Raw material of aluminium contains of 92-99% of purity. Nickel as addition element contain of 90-92% purity. Practical implications: The addition of nickel should be prepared wisely in term of the calculation of alloying treatment because it will effect the mechanical properties of Al alloy itself. This research can be improved by varying the temperature of casting process, variation of nickel percentage, and observation of mechanical properties of Al-Ni alloy. Originality/value: Simple route of making Al-Ni alloy using sand casting method in laboratory and also the observation of nickel addition in aluminium matrix as the result of casting product.

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33

Bașliu, Vasile, Maria Vlad i Gelu Movileanu. "Obtaining Composite Materials with Technological Role by Incorporating Granular Particles in Metal Matrix". Advanced Materials Research 1143 (luty 2017): 79–84. http://dx.doi.org/10.4028/www.scientific.net/amr.1143.79.

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Our paper aims to develop new materials in view of meeting the requirements of reducing pollution in steel plant production. The concept of composite with technological role based on creating new complex metal matrix with solid particles in granular form has multiple purposes, among which we mention reduction of pollution in steels department and reduction of economic losses through recovery and reusing of granular ferroalloy particles. This paper proposes a method and technology for obtaining composite materials using A6061 aluminium alloy as matrix and granular SiC disperse particles. Due to its high carbon content (30%), the composite can be used as complex deoxidiser and decarburization agent in steel elaboration. For the preparation of these composite A6061/SiC, the Stir Casting Vortex method has been considered in order to ensure a high embedding yields in granular state and it was with conducted a rigorous control of process parameters (temperature, speed of rotation, improved ways of introducing particles in granular state). The obtained composites have been characterized for morphology, chemical composition and structural analysis by scanning electron microscopy with energy-dispersive X-ray spectroscopy and X-ray diffraction methods

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Chen, Gui-qing, Shi-ta Huang, Gao-sheng Fu, Jian-xin Wu, Ruo-yu Chen i Zu-qiang Xie. "Study on the Effect of Al-10Sr Intermediate Alloy on the Modification of A356 Aluminum Alloy after Different Purification Treatments". Journal of Physics: Conference Series 2845, nr 1 (1.09.2024): 012041. http://dx.doi.org/10.1088/1742-6596/2845/1/012041.

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Abstract For three different purification treatment methods of aluminum melt: untreated (UT), conventional purification treatment (CPT), impurity removal flux purification treatment (IRF), and Al-10Sr intermediate alloy was applied for modification treatment. The results showed that due to the highest purity of aluminum liquid treated with IRF, the secondary dendrite spacing decreased by 31.32% after modification, and the eutectic silicon phase was in a granular and dispersed distribution. The tensile fracture exhibited ductile fracture characteristics, effectively improving the mechanical properties of the alloy. At the same time, it was found that reducing the Sr content did not decrease the modifying effect, indicating good purity of aluminum liquid can provide superior melt conditions for subsequent modification treatment.

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Srinivasan, P. T., T. Viraraghavan, B. Kardash i Joe Bergman. "Aluminum Speciation during Drinking Water Treatment". Water Quality Research Journal 33, nr 3 (1.08.1998): 377–88. http://dx.doi.org/10.2166/wqrj.1998.021.

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Abstract Aluminum is one of the trace inorganic metals present in drinking water. Aluminum present in alum (a widely used coagulant for water treatment) as well as naturally occurring aluminum in raw water is transformed into various forms (speciation) during drinking water treatment. Speciation of aluminum during drinking water treatment is essential to understand the behavior of aluminum and aluminum species removal during water treatment and also to identify the factors influencing residual aluminum in treated waters. In this connection, an aluminum speciation study was conducted at the Buffalo Pound water treatment plant. Aluminum was fractionated into eight different forms (total, soluble + colloidal, soluble, organic, inorganic, particulate, suspended, and colloidal aluminum). Speciation results showed that raw lake water total aluminum concentrations were highly variable, and almost all of the raw water particulate aluminum (predominant species of total aluminum) was present in suspended form. Soluble aluminum levels throughout the plant (raw to treated) were less than 50 µg/L and most of the soluble aluminum was in organic form. The study showed that granular activated carbon was capable of removing soluble aluminum in organic form. Residual aluminum present in treated water consisted of mostly particulate and organic forms of aluminum. Raw water particulate aluminum correlates well (R2 = 0.90) with raw water turbidity, implying that removal of turbidity from raw water will reduce particulate aluminum in treated waters. Similarly the organic fraction of residual aluminum was influenced by the high dissolved organic carbon present in the raw water. As the soluble aluminum concentrations were less than 50 µg/L, the plant would not have any difficulty to meet a guideline value for aluminum in treated waters in the range of 0.1 to 0.2 mg/L as dissolved aluminum.

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Ito, Tsutomu, i Takashi Mizuguchi. "Superplastic-Like Elongation by Transition of Deformation Mechanism from Grain Boundary Sliding to Solute Drag Creep in Fine-Grained Al-Mg Solid Solution Alloy". Materials Science Forum 941 (grudzień 2018): 1216–21. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1216.

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It is widely accepted that the dominant deformation mechanism of fine-grained superplasticity is through grain boundary sliding (GBS) that occurs in fine-grained materials. However, it has been reported that in “Class I” solid solution alloys, superplastic-like behavior controlled by trans-granular deformation occurs by solute drag creep. In this study, we have investigated superplastic behavior in a fine-grained aluminum solid solution alloy with a thermally unstable microstructure. To obtain fine-grained microstructure, friction stir processing (FSP) was applied to a commercial 5083 aluminum (Al−Mg) alloy. An equiaxial fine-grained microstructure with a grain size of 7.4 μm was obtained after FSP; however, this microstructure was unstable at high temperatures. Generally, for fine-grained superplasticity or GBS to occur or continue, the fine-grained microstructure must be smaller than 10 μm during high-temperature deformation. However, a large elongation of over 200% was observed at high temperatures despite the occurrence of grain growth. From microstructural observations, it was determined that a fine-grained microstructure is maintained in the early stage of deformation, but at strain levels greater than 100%, trans-granular deformation occurs. The microstructural feature of this trans-granular deformation is similar to the deformation microstructure of solute drag creep observed in “Class I” solid solution alloys. This indicates that a change in the deformation mechanism from GBS to solute drag creep takes place during high-temperature deformation. Here, based on our observations on our model system, which is a thermally unstable aluminum solid solution alloy, we discuss the possibility of a superplastic elongation occurring by means of a transition of the deformation mechanism.

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Chen, Xiao Wei, Ya Gao, Hong Liang Zhao, Kang Rong Weng i Bao Feng Zhang. "Research on Microstructure and Refining Effect of Al-3Ti-0.5B Master Alloy Produced with Ti Sponge". Applied Mechanics and Materials 66-68 (lipiec 2011): 845–49. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.845.

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Al-3Ti-0.5B master alloy was prepared by reaction of Ti sponge, KBF4with aluminum melt. The morphology and distribution of the second phases effected by the feeding methods have been discussed. And the grain refining performance and the resistance to fading of the master alloy were investigated. The result shows that the Al-3Ti-0.5B master alloy which was prepared by adding mixture of Ti sponge and KBF4power into molten aluminum contains a large number of granular TiB2phase and blocky TiAl3phase. The average grain size of commercial purity aluminum was refined from 920μm to 120μm by adding 0.5wt.% of the master alloy. And the refining performance of the master alloy shows no obviously fading phenomenon when the holding time up to 30min.

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Zareie Rajani, Hamid Reza, i Andre Bernard Phillion. "3D Meso-Scale Modeling of Solidification for Aluminum-Alloy Welding". Materials Science Forum 790-791 (maj 2014): 79–84. http://dx.doi.org/10.4028/www.scientific.net/msf.790-791.79.

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Meso-scale modeling through the use of a granular-type model is a key new tool for predicting solidification-related defects. In the present study, the application of a granular-type model to welding microstructure is presented, along with application challenges and solutions. This new model can simulate the solidification of a weld pool at the mesoscale, i.e. both solid grains and liquid are included. Consequently, the behaviour of the semisolid structure within the weld pool can be studied. By means of this 3D meso-scale model, the continuous network of liquid channels that forms at the last stages of solidification have been investigated, allowing for prediction of the variation in the distribution of liquid channel width as a function of welding parameters.

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Pisarek, B. P. "Granulation of Cu-Al-Fe-Ni Bronze". Archives of Foundry Engineering 14, nr 3 (8.08.2014): 61–66. http://dx.doi.org/10.2478/afe-2014-0063.

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Abstract With the increase in wall thickness of the casting of iron-nickel-aluminium-bronze, by the reduction of the cooling rate the size of κII phase precipitates increases. This process, in the case of complex aluminium bronzes with additions of Cr, Mo and W is increased. Crystallization of big κII phase, during slow cooling of the casting, reduces the concentration of additives introduced to the bronze matrix and hardness. Undertaken research to develop technology of thick-walled products (g> 6 mm) of complex aluminium bronzes. Particular attention was paid to the metallurgy of granules. As a result, a large cooling speed of the alloy, and also high-speed solidification casting a light weight of the granules allows: to avoid micro-and macrosegregation, decreasing the particle size, increase the dispersion of phases in multiphase alloys. Depending on the size granules as possible is to provide finished products with a wall thickness greater than 6 mm by infiltration of liquid alloy of granules (composites). Preliminary studies was conducted using drip method granulate of CuAl10Fe5Ni5 bronze melted in a INDUTHERM-VC 500 D Vacuum Pressure Casting Machine. This bronze is a starting alloy for the preparation of the complex aluminium bronzes with additions of Cr, Mo, W and C or Si. Optimizations of granulation process was carried out. As the process control parameters taken a casting temperature t (°C) and the path h (mm) of free-fall of the metal droplets in the surrounding atmosphere before it is intensively cooled in a container of water. The granulate was subjected to a sieve analysis. For the objective function was assume maximize of the product of Um*n, the percentage weight “Um” and the quantity of granules ‘n’ in the mesh fraction. The maximum value of the ratio obtained for mesh fraction a sieve with a mesh aperture of 6.3 mm. In the intensively cooled granule of bronze was identified microstructure composed of phases: β and fine bainite (α+β′+β′1) and a small quantity of small precipitates κII phase. Get high microhardness bronze at the level of 323±27,9 HV0,1.

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He, Q., P. OuYang, M. Dai, H. Guan, J. Hu, S. He, Y. Wang i L. F. Wei. "Lumped element granular aluminum resonators with high kinetic inductances". AIP Advances 11, nr 6 (1.06.2021): 065204. http://dx.doi.org/10.1063/5.0046910.

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Zheng, Tianye, Xiaogang Wang, Ekta Jain, Dominik Kramer, Reiner Mӧnig, Matteo Seita i Steven T. Boles. "Granular phase transformation of polycrystalline aluminum during electrochemical lithiation". Scripta Materialia 188 (listopad 2020): 164–68. http://dx.doi.org/10.1016/j.scriptamat.2020.07.029.

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Yamada, Kazumasa, Hiroyuki Fujiki, Bunjyu Shinozaki i Takasi Kawaguti. "Superconducting properties in granular aluminum films near percolation threshold". Physica C: Superconductivity 355, nr 1-2 (czerwiec 2001): 147–55. http://dx.doi.org/10.1016/s0921-4534(00)01768-8.

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Hooper, Joseph P., Christoper L. Milby, Richard J. Lee i R. Jason Jouet. "High-velocity Impact Fragmentation of Brittle, Granular Aluminum Spheres". Procedia Engineering 58 (2013): 663–71. http://dx.doi.org/10.1016/j.proeng.2013.05.076.

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Gabutti, A., K. E. Gray, G. M. Pugh i R. C. Tiberio. "Improved beta detection efficiency with granular aluminum superconducting strips". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 306, nr 1-2 (sierpień 1991): 220–24. http://dx.doi.org/10.1016/0168-9002(91)90324-j.

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Nath, Sudipta, i Utpal Madhu. "Study of Densification Behavior of SiAlONs Using Dysprosium Containing Additive System". International Journal of Experimental Research and Review 26 (30.12.2021): 16–34. http://dx.doi.org/10.52756/ijerr.2021.v26.002.

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SiAlON ceramics have complicated chemistry and should be considered a group of alloys with diverse characteristics. It is generated when silicon nitride (Si3N4), aluminium oxide (Al2O3) and aluminium nitride (AlN) react together. If sintering aids such as Dysprosium oxide are added to the initial composition, fully dense polycrystalline bodies can be produced through pressureless sintering.Inter-granular phase composition and structure may be modified by dopants and sintering conditions, which significantly impact the characteristics of SiAlON ceramics. The focus of this study was concentrated on the nature of densification and nature of the phases that appeared in SiAlON. It was found that the volume and density of all the specimens considerably reduced and enhanced, respectively owing to sintering at elevated temperatures. The XRD results showed various phases as per their relative intensities, which indicates densification will alter different properties, especially mechanical and thermal properties.

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Grünhaupt, Lukas, Martin Spiecker, Daria Gusenkova, Nataliya Maleeva, Sebastian T. Skacel, Ivan Takmakov, Francesco Valenti i in. "Granular aluminium as a superconducting material for high-impedance quantum circuits". Nature Materials 18, nr 8 (29.04.2019): 816–19. http://dx.doi.org/10.1038/s41563-019-0350-3.

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Finkelstein, A. B., i S. N. Zlygostev. "Permeability coefficient of replicated aluminium foarm with double-granular space holder". Tsvetnye Metally, nr 5 (31.05.2023): 51–55. http://dx.doi.org/10.17580/tsm.2023.05.07.

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Lau, B. L. T., G. W. Harrington, M. A. Anderson i I. Tejedor. "Removal of nano and microparticles by granular filter media coated with nanoporous aluminium oxide". Water Science and Technology 50, nr 12 (1.12.2004): 223–28. http://dx.doi.org/10.2166/wst.2004.0717.

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Conventional filtration was designed to achieve high levels of particle and pathogen removal. Previous studies have examined the possibility of modifying filtration media to improve their ability to remove microorganisms and viruses. Although these studies have evaluated filter media coatings for this purpose, none have evaluated nanoscale particle suspensions as coating materials. The overall goal of this paper is to describe the preliminary test results of nanoporous aluminium oxide coated media that can be used to enhance filtration of nano and microparticles. Filtration tests were carried out using columns packed with uncoated and coated forms of granular anthracite or granular activated carbon. A positive correlation between isoelectric pH of filter media and particle removal was observed. The modified filter media with a higher isoelectric pH facilitated better removal of bacteriophage MS2 and 3 μm latex microspheres, possibly due to increased favorable electrostatic interactions.

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Calabrò, Paolo S., Filippo Fazzino, Carlo Limonti i Alessio Siciliano. "Enhancement of Anaerobic Digestion of Waste-Activated Sludge by Conductive Materials under High Volatile Fatty Acids-to-Alkalinity Ratios". Water 13, nr 4 (3.02.2021): 391. http://dx.doi.org/10.3390/w13040391.

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Anaerobic digestion (AD) represents a suitable option for the management of the waste-activated sludge (WAS) produced in municipal wastewater treatment plants. Nevertheless, due to its complex characteristics, WAS is often barely degradable under conventional anaerobic processes. The use of conductive materials during AD provides a promising route for enhancing WAS digestion, through the effects of direct inter-species electron transfer (DIET). The present paper aims to evaluate the effects of the addition of four different materials—granular activated carbon (GAC), granular iron, and aluminium and steel scrap powders—in semi-continuous lab-scale reactors under very high volatile fatty acids-to-alkalinity ratios. In particular, the use of metallic aluminium in WAS digestion was investigated for the first time and compared to the other materials. The AD of WAS without the addition of conductive materials was impossible, while the use of steel powder and zero-valent iron is shown not to improve the digestion process in a satisfactory way. On the contrary, both GAC and Al allow for effective WAS degradation. At stable conditions, methane yields of about 230 NmLCH4/gVS and 212 NmLCH4/gVS are recorded for GAC- and Al-amended reactors, respectively. These two materials are the most promising in sustaining WAS AD through DIET also in case of unbalanced volatile fatty acids-to-alkalinity ratios.

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Sukhumkitcharoen, Rawiwan, Junichi Koseki, Hiroyuki Kyokawa i Masahide Otsubo. "Liquefaction behaviour of aluminium and plastic rod assemblies using bi-axial apparatus with application of image analysis". E3S Web of Conferences 544 (2024): 10002. http://dx.doi.org/10.1051/e3sconf/202454410002.

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It has recently been shown that the overall deformation characteristics of granular materials during liquefaction seems to be governed by local void ratio characteristics. The aim of this study is to investigate the relationship between mechanical properties and local void ratio changes during liquefaction in two materials of different weights (aluminium-type and plastic-type rod assemblies). A series of constant-volume cyclic bi-axial loading tests was conducted together with the image analysis obtaining local void behaviour. The experimental results demonstrate that the first liquefaction resistance of the plastic sample is higher than the aluminium one, corresponding to its smaller initial void ratio and less contractive behaviour observed in the early stage of drained monotonic compression. However, after experiencing the first liquefaction and subsequent re-consolidation histories, a liquefiable assembly of aluminium and plastic rods both became either denser (densification) or more homogenous (homogenization) in terms of local void ratio, suggesting an increase in liquefaction resistance in the next liquefaction stage. This work also includes a preliminary analogous study using a semi-3D discrete element method (DEM) with one single layer of spherical particles to simulate the similar liquefaction behaviour observed in the laboratory tests.

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