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Добірка наукової літератури з теми "AZ91D"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 12 лютого 2022

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Статті в журналах з теми "AZ91D"

Melnikov, Evgenii S., Maria A. Surmeneva, Alexander I. Tyurin, Tatyana S. Pirozhkova, Ivan A. Shuvarin, Oleg Prymak, Matthias Epple, and Roman A. Surmenev. "Improvement of the Mechanical Properties of AZ91D Magnesium Alloys by Deposition of Thin Hydroxyapatite Film." Nano Hybrids and Composites 13 (January 2017): 355–61. http://dx.doi.org/10.4028/www.scientific.net/nhc.13.355.

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Structural and mechanical behavior of thin hydroxyapatite (HA) films deposited via radio-frequency magnetron sputtering on AZ91D magnesium alloy was investigated. Nanoindentationwas employed to evaluate nanohardness and Young’s modulus of the uncoated and HA-coated AZ91 magnesium alloy. The HA-coated AZ91D magnesium alloy exhibited a higher hardness of 7.1 GPa and a higher modulus of 86 GPa compared withthe uncoated substrate revealing a strong load-bearing capacity.

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Shkurankov, Andrey, Sherif Zein El Abedin, and Frank Endres. "AFM-Assisted Investigation of the Corrosion Behaviour of Magnesium and AZ91 Alloys in an Ionic Liquid with Varying Water Content." Australian Journal of Chemistry 60, no. 1 (2007): 35. http://dx.doi.org/10.1071/ch06305.

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Atomic force microscopy (AFM)-assisted corrosion measurements of poly- and microcrystalline magnesium, of AZ91D magnesium alloys, and of AZ91D alloys with defined amounts of metallic impurities (Cu, Ni, and Si) in the ionic liquid 1-butyl-3-methylimidazolium trifluoromethylsulfonate with variable water contents is reported. Whereas both magnesium and the AZ91 alloys show a tremendous corrosion in aqueous solutions, they are practically inert in the water-free ionic liquid. The apparent electrochemical window of the water-free ionic liquid on magnesium and its alloys can reach values of 10 V and more. The low corrosion rate of AZ91 alloys with metallic impurities, in any case, follows the trend in aqueous solutions: in comparison to the base alloy, the addition of nickel and silicon leads to higher corrosion rates. Upon addition of water to the ionic liquid two effects are observed. The higher the water content in the ionic liquid, the lower the corrosion potential and the higher the corrosion rate. Poly- and microcrystalline magnesium shows a surprisingly complicated corrosion behaviour, which gives rise to different processes during electrochemical polarization. As a proof-of-principle, in-situ AFM measurements were performed on the corrosion of AZ91D alloy in the ionic liquid. No corrosion products are observed at the surface in the water-free ionic liquid by in-situ AFM, even after several hours at +3 V versus a saturated calomel electrode (SCE), which indicates surface passivation in the ionic liquid.

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Ming, Yuan, Yu Sirong, Liu Enyang, Li Fanguo, Zhao Yan, Zhang Shanbao, and Li Jingda. "High-temperature damping capacity of fly ash cenosphere/AZ91D Mg alloy composites." Science and Engineering of Composite Materials 25, no. 1 (January 26, 2018): 197–204. http://dx.doi.org/10.1515/secm-2016-0094.

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AbstractIn this study, fly ash cenospheres were added to semisolid AZ91D Mg alloy to prepare fly ash cenosphere/AZ91D (FAC/AZ91D) composites by means of compo-casting. The high-temperature damping capacity of FAC/AZ91D composites was investigated as compared with AZ91D Mg alloy. The results show that the damping capacities of FAC/AZ91D composites and AZ91D Mg alloy strongly depend on the measuring temperature. The FAC/AZ91D composites show better damping capacity than AZ91D Mg alloy. The 10 wt.% FAC/AZ91D composites exhibit the best damping capacity from room temperature to 125°C, whereas the 2 wt.% FAC/AZ91D composites show the highest damping capacity at 125°C–320°C. The damping mechanism was analyzed by microstructure observation at elevated temperatures. The damping-temperature curves exhibit a damping peak at approximately 150°C, and the activation energy of the damping peak was calculated according to the Arrhenius equation. Furthermore, the peak temperature increases with increasing frequencies. The damping peak is related to the thermal activation relaxation process, and its mechanism is the dislocation-induced damping.

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Jia, Suqiu, Shu Sheng Jia, Guangping Sun, and Jun Yao. "The Corrosion Behaviour of Mg Alloy AZ91D/TiCp Metal Matrix Composite." Materials Science Forum 488-489 (July 2005): 705–8. http://dx.doi.org/10.4028/www.scientific.net/msf.488-489.705.

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The corrosion of a magnesium-based MMC, comprising a AZ91D alloy matrix and 5 vol% titanium carbide particles has been studied in saline environments, using immersion and electrochemical tests. Corrosion was localized initially and developed subsequently into general corrosion , the local corrosion rate of AZ91D/TiCp being faster than diecast AZ91D due to the formation of less protective corrosion products. Galvanic corrosion for AZ91D/TiCp, due to coupling of the matrix and reinforcement, was more severe than diecast AZ91D.

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Hu, Xiao Shi, Kun Wu, Ming Yi Zheng, Shi Wei Xu, and Y. K. Zhang. "Effect of Deformation on the Damping Capacity of Magnesium Alloys." Materials Science Forum 488-489 (July 2005): 737–40. http://dx.doi.org/10.4028/www.scientific.net/msf.488-489.737.

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Equal channel angular extrusion (ECAE) was applied to an as-cast AZ91D magnesium alloy. The strain amplitude dependence and temperature dependence of damping capacities of the as-cast and ECAE processed AZ91D alloys were investigated by dynamic mechanical analyzer (DMA). Microstructures of AZ91D alloys after ECAE were observed by optical microscopy (OM). In higher strain region, the damping value of 4-pass ECAE deformed AZ91D alloy was the highest among all the AZ91D alloys under different conditions. The damping peaks of ECAE deformed AZ91D alloys detected during heating from room temperature to 400°C were considered to be related to the migration of grain boundaries and the movement of dislocations during recrystallization.

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ZHANG, X. P., Y. S. ZOU, F. M. WU, Z. P. ZHAO, L. YOU, C. F. GU, and Y. Z. LIAO. "WEAR RESISTANCE OF AZ91D MAGNESIUM ALLOY WITH AND WITHOUT MICROARC OXIDATION COATING AND Ti6Al4V ALLOY IN ARTIFICIAL SALIVA." Surface Review and Letters 16, no. 06 (December 2009): 821–30. http://dx.doi.org/10.1142/s0218625x09013372.

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The wear resistances of AZ91D magnesium alloy with and without microarc oxidation (MAO) coating and Ti 6 Al 4 V alloy in artificial saliva were investigated at room temperature. The wear resistance of AZ91D magnesium alloy in artificial saliva was significantly improved after microarc oxidation treatment. The volume loss of untreated AZ91D magnesium alloy sample was 20.95 times of that of AZ91D magnesium alloy with MAO coating, and that of Ti 6 Al 4 V was 5.42 times of that of MAO. Furthermore, the wear resistance of AZ91D magnesium alloy was lower than that of Ti 6 Al 4 V alloy in artificial saliva. The wear mechanisms of AZ91D magnesium and Ti 6 Al 4 V were discussed. It was found that the wear mechanism of the MAO was associated with abrasion and microfracture. There were two dominative wear mechanisms for AZ91D alloy and Ti 6 Al 4 V alloy under the loading conditions used in the experiment, namely, micro-machining wear and deformation-induced wear.

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Cheng, Jun, Jian-hua Zhao, Jin-yong Zhang, Yu Guo, Ke He, Jing-Jing Shang-guan, and Fu-lin Wen. "Microstructure and Mechanical Properties of Galvanized-45 Steel/AZ91D Bimetallic Material by Liquid-Solid Compound Casting." Materials 12, no. 10 (May 21, 2019): 1651. http://dx.doi.org/10.3390/ma12101651.

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A connection between hot-dip galvanized 45 steel and AZ91D was achieved by liquid-solid compound casting to achieve one material with a better mechanical performance and a light weight. The microstructure and properties of galvanized-steel/AZ91D bimetallic materials were investigated in this study. A scanning electron microscopy (SEM), an energy dispersive spectroscopy (EDS), and an X-ray diffraction (XRD) were applied to analyze the microstructure evolution and formation mechanism of the galvanized 45 steel/AZ91D interface zone which could be divided into three layers. Among three different layers, the layer close to AZ91D was composed of α-Mg and an eutectic structure (α-Mg + MgZn). The intermediate layer was comprised of an eutectic structure (α-Mg + MgZn), and the layer adjacent to 45 steel consisted of α-Mg and FeAl3. Furthermore, galvanized-45 steel/AZ91D bimetallic material had better shear strength than the bare-45 steel/AZ91D metallic material which can indicate that owing to the formation of metallurgical bonding, the adhesive strength of galvanized-steel and AZ91D was improved to 11.81 MPa. In addition, the fact that corrosion potential increased from −1.493 V to −1.143 V and corrosion current density changed from 3.015 × 10−5 A/cm2 to 1.34 × 10−7 A/cm2 implied that the corrosion resistance of galvanized-steel/AZ91D was much better than AZ91D.

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Fahad, Mohammed, and Bavanish B. "Tribological behavior of AZ91D magnesium alloy composite: effect of hybrid WC – SiO2 nanoparticles." Industrial Lubrication and Tribology 73, no. 5 (July 14, 2021): 789–95. http://dx.doi.org/10.1108/ilt-02-2021-0038.

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Purpose Aviation field requires a material with greater tribological characteristics to withstand the critical climate conditions. Hence, it is of paramount importance to enhance the wear resistance of material. AZ91D magnesium alloy is a light weight material used in the aviation field for the construction work. The purpose of this study is to augment the wear properties of AZ91D alloy by reinforcing with hard particles such as tungsten carbide (WC) and silicon dioxide (SiO2). Design/methodology/approach In this work, three types of composites were fabricated, namely, AZ91D – WC, AZ91D – SiO2 and AZ91D – (WC + SiO2) by ball milling method, and the tribological properties were analyzed using pin-on-disc apparatus. Findings Results showed that the hardness of AZ91D alloy was greatly improved due to the reinforcing effects of WC and SiO2 particles. Wear study showed that wear rate of AZ91D alloy and its composites increased with the increase of applied load due to ploughing effect and decreased with the increase of sliding speed owing to the formation of lubricating tribolayer. Further, the AZ91D – (WC + SiO2) composite exhibited the lower wear rate of 0.0017 mm3/m and minimum coefficient of friction of 0.33 at a load of 10 N and a sliding speed of 150 mm/s due to the inclusion of hybrid WC and SiO2 particles. Hence, the proposed AZ91D – (WC + SiO2) composite could be a suitable candidate to be used in the aviation applications. Originality/value This work is original which deals with the effect of hybrid particles, i.e. WC and SiO2 on the wear performance of the AZ91D magnesium alloy composites. The literature review showed that none of the studies focused on the reinforcement of AZ91D alloy by the combination of carbide and metal oxide particles as used in this investigation.

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Lin, Bi Lan, Yu Ye Xu, and En Cai Li. "Effect of Phosphating Additives on Corrosion Resistance of Phosphate Coatings on AZ91D Magnesium Alloy." Advanced Materials Research 337 (September 2011): 112–15. http://dx.doi.org/10.4028/www.scientific.net/amr.337.112.

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AZ91D magnesium alloys were immersed in different phosphating solutions with zinc nitrate and sodium fluoride additives to enhance the corrosion resistance. The devolution law of the Open Circuit Potential (OCP) of AZ91D alloys during phosphating was measured. The corrosion behaviors of AZ91D alloys in 3.5%NaCl solution were investigated using OCP and Tafel polarization methods, and the effect of phosphating additives was discussed. The results show that the changes of the OCP of AZ91D alloys with phosphating time in different phosphating solutions are different; the anodic and cathodic corrosion processes of AZ91D alloys are conspicuously inhibited with phosphate coatings; zinc nitrate and sodium fluoride are benefit to form phosphate coatings with better corrosion resistance. The corrosion potential of AZ91D alloy phosphated in solutions with both zinc nitrate and sodium fluoride is most positive.

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Wang, Yingying, Bernard Normand, Xinkun Suo, Marie-Pierre Planche, Hanlin Liao, and Junlei Tang. "Cold-Sprayed AZ91D Coating and SiC/AZ91D Composite Coatings." Coatings 8, no. 4 (March 26, 2018): 122. http://dx.doi.org/10.3390/coatings8040122.

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Більше джерел

Дисертації з теми "AZ91D"

Fernández, Gustavo Jorge. "Proceso de extrusión de la aleación de Magnesio AZ91D." Bachelor's thesis, Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Escuela de Ingeniería Aeronáutica, 2016. http://hdl.handle.net/11086/5577.

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Proyecto Integrador (IA)--FCEFN-UNC, 2016
Analiza la posibilidad de deformación plástica de la Aleación de Magnesio AZ91D, obtenida a partir de un proceso de re fusión de virutas de mecanizado. Los ensayos consisten en someter este material a un proceso de extrusión en caliente, para lo cual se realiza un estudio completo del material, del proceso de extrusión, se diseña un dispositivo para extruir y se desarrolla una metodología de trabajo. Los resultados muestran que el material se deforma plásticamente bajo la acción de cargas de compresión a alta temperatura.

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Milne, Rodrigo. "Recuperación pulvimetalúrgica de aleación de magnesio AZ91D con fines estructurales." Bachelor's thesis, Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Escuela de Ingeniería Aeronáutica, 2015. http://hdl.handle.net/11086/2201.

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Анотація:

Proyecto Integrador (IA)--FCEFN-UNC, 2015
Desarrolla un método que permite la recuperación de la viruta de aleación de magnesio AZ91D, producto del mecanizado de carcasas de cajas de velocidades, mediante técnicas de pulvimetalurgia con la finalidad de poder aplicarse en componentes estructurales aeroespaciales. Se propone estudiar el efecto que poseen las variables más importantes del proceso sobre las propiedades mecánicas de la pieza final.

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Dini, Hoda. "As-cast AZ91D Magnesium Alloy Properties- Effect of Microstructure and Temperature." Licentiate thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH. Forskningsmiljö Material och tillverkning – Gjutning, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-28467.

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Magnesium and magnesium alloys are used in a wide variety of structural applications including automotive, aerospace, hand tools and electronic industries thanks to their light weight, high specific strength, adequate corrosion resistance and good castability. Al and Zn are the primary alloying elements in commercial Mg alloys and commonly used in automotive industries. AZ91 is one of the most popular Mg alloys containing 9% Al and 1% Zn. Hence, lots of research have been done during last decades on AZ91D. However, the existing data concerning mechanical properties and microstructural features showed large scatter and is even contradictory. This work focused on the correlation between the microstructure and the mechanical properties of as-cast AZ91 alloy. An exhaustive characterization of the grain size, secondary dendrite arm spacing (SDAS) distribution, and fraction of Mg17Al12 using optical and electron backscattered diffraction (EBSD) was performed. These microstructural parameters were correlated to offset yield point (Rp0.2), fracture strength and elongation to fracture. It was understood that the intermetallic phase, Mg17Al12, plays an important role in determining the mechanical and physical properties of the alloy at temperature range from room temperature up to 190oC. It was realized that by increasing the Mg17Al12 content above 11% a network of intermetallic may form. During deformation this rigid network should break before any plastic deformation happen. Hence, increase in Mg17Al12 content resulted in an increase in offset yield point. The presence of this network was supported by study of thermal expansion behaviour of the alloy containing different amount of Mg17Al12. A physically-based model was adapted and validated in order to predict the flow stress behaviour of as-cast AZ91D at room temperature up to 190ºC for various microstructures. The model was based on dislocation glide and climb in a single-phase (matrix) material containing reinforcing particles. The temperature dependant variables of the model were quite well correlated to the underlying physics of the material.

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Liu, Guojun. "A study on twin-screw rheo-diecasting of AZ91D Mg-alloy." Thesis, Brunel University, 2006. http://bura.brunel.ac.uk/handle/2438/5227.

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A newly developed one-step semisolid process by BCAST for semisolid processing of magnesium alloy was studied in this thesis - the Twin-Screw Rheo-Diecasting (RDC) of AZ91D Mg-alloy. The RDC process is an innovative process which combines the dispersive mixing power of the Twin-Screw Slurry Maker (TSSM) for creation of high quality semisolid slurry and the existing cold chamber High-Pressure Die-Casting (HPDC) process for component shaping. Magnesium alloys, due to their low density and superior strength/weight ratio, offer distinct advantages in weight savings, and are gaining increasing interests in applications. The research on the new RDC technology aimed to eliminate the limitations of the conventional HPDC and to meet the requirements from extensive application of Mg-alloys. In this thesis, the major tasks were to optimise of the RDC technology, to evaluate the microstructure and mechanical properties of RDC AZ91D Mg-alloy in both as-cast and heat treated conditions, and to understand the solidification process in the TSSM. The results of the RDC as-cast state indicated that the microstructure of primary a-Mg particles had a fine size (around 40μm), extremely spherical morphology and uniform distribution throughout the entire castings; the RDC AZ91D samples had extremely low levels of porosity. Due to the unique microstructure and much reduced level of defects, the RDC AZ91D alloy exhibited a substantial improvement in mechanical properties. In addition, a traditional full heat treatment was performed for RDC AZ91D alloy. Compared with HPDC alloy, the RDC AZ91D alloy was found to exhibit an accelerated dissolution of ß-Mg17A112during solution treatment, and a faster age-hardening kinetics of the ß-phase during subsequent ageing. The microstructural investigations showed that under intensive forced convection, heterogeneous nucleation occurred continuously throughout the entire volume of the solidifying melt and the nuclei grew spherically. Ostwald ripening took place by dissolution of the smaller particles but at a very slow coarsening rate. Increasing the intensity of forced convection enhanced nucleation and reduced volume fraction of primary phase solidified in the slurry maker. This study has demonstrated that the novel RDC process possesses a number of advantages and it is suitable for production of high integrity Mg-alloy components.

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Dini, Hoda. "As-cast AZ91D magnesium alloy properties : Effects of microstructure and temperature." Doctoral thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Material och tillverkning, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-38148.

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Today, there is an essential need for lightweight, energy-efficient, environmentally benign engineering systems, and this is the driving force behind the development of a wide range of structural and functional materials for energy generation, energy storage, propulsion, and transportation. These challenges have motivated the use of magnesium alloys for lightweight structural systems. Magnesium has a density of 1.74 g/cm3, which is almost 30% less than that of aluminium, one quarter of steel, and almost identicalto polymers. The ease of recycling magnesium alloys as compared to polymers makes them environmentally attractive, but their poor mechanical performance is the primary reason for the limited adoption of these alloys for structural applications. The Mg-Al-Zn alloy AZ91D exhibits an excellent combination of strength, die-castability, and corrosion resistance. However, its mechanical performance with regard to creep strength, for example, at evaluated temperatures is poor. Moreover, very little is known about the correlation between its mechanical properties and microstructural features. This thesis aims to provide new knowledge regarding the role played by microstructure in the mechanical performance of the magnesium alloy. The properties/performance of the material in relation to process parameters became of great interest during the investigation. An exhaustive characterisation of the grain size, secondary dendrite arm spacing (SDAS) distribution, and fraction of Mg17Al12 was performed using optical and electron backscatter diffraction (EBSD). These microstructural parameters were correlated to the offset yield point (Rp0.2), fracture strength, and elongation to failure of the material. It was proposed that the intermetallic phase, Mg17Al12, plays an important role in determining the mechanical and physical properties of the alloy in a temperature range of room temperature to 190°C by forming a rigid network of intermetallic. The presence of this network was confirmed by studying the thermal expansion behaviour of samples of the alloy containing different amounts of Mg17Al12. A physically based constitutive model with a wide validity range was successfully adapted to describe the flow stress behaviour of AZ91D with various microstructures. The temperature-dependent variables of the model correlated quite well with the underlying physics of the material. The model was validated through comparison with dislocation densities obtained using EBSD. The influence of high-pressure die-cast parameters on the distortion and residual stress of the cast components was studied, as were distortion and residual stress in components after shot peening and painting. Interestingly, it was found that intensification pressure has a major effect on distortion and residual stresses, and that the temperature of the fixed half of the die had a slight influence on the component's distortion and residual stress.
Numera finns det ett väsentligt behov av lätta, energieffektiva och miljövänliga tekniksystem. Detta behov är drivkraften för utveckling av ett brett utbud av material för energigenerering, energilagring, framdrivning och transport. Dessa utmaningar motiverade användningen av magnesiumlegeringar för lättviktskonstruktioner. Magnesium har en densitet på 1,74 g/cm3, vilket är ca 30% lägre än för aluminium, en fjärdedel av densiteten för stål och nästan i nivå med många polymerer. Då magnesiumlegeringar dessutom är lätta att återvinna, jämfört med polymerer, gör det dem miljömässigt attraktiva. Låga mekaniska egenskaper är den främsta orsaken till begränsad användning av dessa legeringar för lastbärande tillämpningar. Mg-Al-Zn-legeringen AZ91D uppvisar en utmärkt kombination av styrka, gjutbarhet och korrosionsbeständighet. Dess mekaniska egenskaper vid förhöjd temperatur, som tex kryphållfasthet, är låga. Dessutom är korrelationen mellan mikrostruktur och mekaniska egenskaper oklar. Denna avhandling syftade till att ge ny kunskap om mikrostrukturens roll för magnesiumlegeringars mekaniska egenskaper. Slutligen var materialets egenskaper i förhållande till processparametrar vid tillverkningen av stort intresse. En omfattande karaktärisering av kornstorleks-, sekundära dendritarmavstånds (SDAS)-fördelning och fraktion av Mg17Al12 utfördes med hjälp av optisk mikroskopering och diffraktion av bakåtspridda elektroner (EBSD). Mikrostrukturen korrelerades till sträckgränsen (Rp0.2), brottstyrkan och brottförlängningen. Det föreslogs att den intermetalliska fasen, Mg17Al12, spelar en viktig roll vid bestämning av legeringens mekaniska och fysikaliska egenskaper vid temperaturintervall från rumstemperatur upp till 190°C genom att bilda ett styvt nätverk av intermetaller. Uppkomsten av ett sådant nätverk stöddes genom en studie av den termiska expansionen av legeringen för olika fraktioner av Mg17Al12. En fysikalisk konstitutiv modell med ett brett giltighetsområde användes framgångsrikt för att beskriva det plastiska flytbeteendet hos AZ91D för olika mikrostrukturer. De temperaturberoende variablerna i modellen korrelerade ganska väl med materialets underliggande fysik. Modellen validerades genom att jämföra dislokationstätheten som predikterades av modellen och den med EBSD uppmätta dislokationstätheten. Påverkan av pressgjutningsparametrar på geometrisk tolerans och restspänning hos de gjutna komponenterna studerades. Vidare studerades geometrisk tolerans och restspänning av komponenter efter pening och målning. Intressant nog hade eftermatningsfasen en stor effekt på geometrisk tolerans och restspänningar. Dessutom hade temperaturen på den fasta formhalvan av verktyget även ett visst inflytande på komponentens geometriska tolerans och restspänning.

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Cavallo, María Sara, and Mariana Lucía Flores. "Recubrimientos biodegradables para AZ91D, evaluación del desempeño en fluido fisiológico simulado." Bachelor's thesis, Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales, 2017. http://hdl.handle.net/11086/6491.

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Анотація:

Proyecto Integrador (I.Biom.)--FCEFN-UNC, 2017
Realiza la aplicación de técnicas para generar recubrimientos sobre muestras de aleación de magnesio AZ)!D con la finalidad de evaluar el carácter protector frente a la corrosión en un medio fisiológico simulado. Enmarcado en el uso del magnesio y sus aleaciones como metales para implantes biodegradables

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戴有志 та Yo-Zhi Dai. "鎂基複合材料AZ91D/SiCp之磨耗研究". 碩士, 國立中正大學, 1995. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22095CCU05311078%22.&searchmode=basic.

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Paradis, Mathieu. "Évaluation et identification des inclusions dans les alliages de magnésium AM50A et AZ91D." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2003. http://theses.uqac.ca.

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Ribeiro, Eloana Patrícia. "Desenvolvimento de revestimentos de conversão à base de cério em liga de magnésio AZ91D." reponame:Repositório Institucional da UFABC, 2017.

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Анотація:

Orientador: Prof. Dr. Renato Altobelli Antunes
Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Nanociências e Materiais Avançados, 2017.
Neste estudo foram avaliadas três técnicas de dispersão para o processamento de nanocompósitos de matriz de epóxi com nanopartículas de diferentes geometrias: lamelares, fibrilares e esféricas. Para isso, foram preparados nanocompósitos com montmorilonita, laponita, nanotubos de haloisita, nanotubos de carbono e nanossílica por meio de mistura mecânica, sonicação e moagem de alta energia. A dispersão das nanopartículas na matriz foi avaliada por microscopia eletrônica de varredura, difração de raios X e espalhamento de raios x a baixo ângulo. Os resultados mostraram que o processo de sonicação foi o melhor para dispersar as nanopartículas em epóxi, sendo, portanto, utilizado para a fabricação de nanocompósitos híbridos com matriz de epóxi. Esses materiais apresentam duas fases sólidas nanométricas dispersas na matriz e, neste estudo, foram combinadas nanopartículas de diferentes geometrias, a fim de avaliar as propriedades mecânicas e reológicas dos híbridos e compará-las com as dos nanocompósitos com apenas uma nanopartícula (nanocompósitos convencionais). As propriedades mecânicas foram medidas por meio de ensaios de resistência à flexão, de resistência ao impacto (Izod) e análise dinâmico-mecânica. As propriedades reológicas foram medidas por meio de ensaios de cisalhamento oscilatório de pequenas amplitudes das dispersões não curadas. Com exceção da ductilidade, os nanocompósitos convencionais exibiram propriedades inferiores às da matriz. Já os nanocompósitos híbridos apresentaram propriedades mecânicas superiores às dos nanocompósitos convencionais, e em alguns casos, superiores às da matriz, indicando algum nível de efeito sinergético entre as nanopartículas. As propriedades reológicas das dispersões não curadas indicaram que algumas partículas apresentaram boa dispersão na matriz, antes do processo de cura. Contudo, tal característica não foi convertida em ganhos reais de propriedades mecânicas e os nanocompósitos correspondentes exibiram propriedades muito similares às das amostras supostamente mal dispersas. Esse foi um indicativo de que as propriedades finais dos nanocompósitos foram essencialmente determinadas pelos parâmetros envolvidos no processo de cura do material.
In this study, three dispersion techniques were evaluated for the processing of nanocomposites with epoxy matrix and nanoparticles with different geometries: lamellar, fibrillar and spherical. Therefore, nanocomposites with montmorillonite, laponite, halloysite nanotubes, carbon nanotubes and nanosilica were prepared via magnetic stirring, sonication and high energy milling. The dispersion of the nanoparticles in the epoxy matrix was evaluated using scanning electron microscopy, X-ray diffraction and small angle X-ray scattering. The results showed that sonication was the best method to disperse the nanoparticles in epoxy. Thus, it was used to manufacture hybrid nanocomposites with epoxy matrix. These materials have two different nanometric solid phases, dispersed in the matrix and, in this study, nanoparticles of different geometries were combined, aiming to evaluate the mechanical and rheological properties of the hybrids and compare them to those of the nanocomposites which have only one nanoparticle (conventional nanocomposites). The mechanical properties of the nanocomposites were evaluated through flexural testing, impact strength (Izod) and dynamic-mechanical analysis. The rheological properties were measured by small amplitude oscillatory shear tests of the uncured dispersions. Apart from ductility, the conventional nanocomposites showed inferior properties to those of the matrix. However, the hybrid nanocomposites exhibited superior properties to those of conventional nanocomposites and in some cases, even superior to those of the matrix, suggesting some level of synergistic effects between the nanoparticles. The rheological properties of the uncured dispersions indicated that some particles had good dispersion in the matrix, prior to the curing process. However, such feature was not converted into real gains on mechanical properties and the corresponding nanocomposites exhibited very similar properties to the supposedly poorly dispersed samples. This was an indicative that the final properties of nanocomposites were essentially determined by the parameters involved in the material curing process.

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Fritzsch, Katja. "Beitrag zur Verbesserung des Korrosions- und Verschleißverhaltens der Magnesiumlegierung AZ91D mittels lokaler Elektronenstrahl-Flüssigphasen-Randschichtbehandlung." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2018. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-232556.

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Magnesiumwerkstoffe sind aufgrund ihrer geringen Dichte und hohen spezifischen Festigkeit für den Leichtbau prädestiniert. Ziel der vorgelegten Arbeit ist es, durch die gleichzeitige Verbesserung des Korrosions- und Verschleißverhaltens neue Anwendungsfelder für Magnesiumlegierungen zu erschließen. Anhand der Magnesiumlegierung AZ91D wurden die Möglichkeiten einer lokalen beanspruchungsgerechten Modifikation von Struktur und Gefüge im oberflächennahen Bereich durch eine Elektronenstrahl(EB)-Flüssigphasen-Randschichtbehandlung ohne Zusatzstoff (EB-Umschmelzen) und unter Verwendung von Al-Si-Zusatzstoffen (EB-Umschmelzlegieren) aufgezeigt. Die mittels verschiedener hochfrequenter Strahlablenktechniken erzeugten Schichten weisen eine deutliche Gefügefeinung, neue Gefügemorphologien sowie eine veränderte Phasenverteilung und/oder -neubildung auf, sind riss- und porenfrei und haben eine ausgezeichnete schmelzmetallurgische Anbindung an den Grundwerkstoff. Anhand von Tauchversuchen und potentiodynamischen Polarisationsmessungen in verschieden konzentrierten NaCl-Lösungen konnte eine signifikante Verbesserung des Korrosionsverhaltens der generierten Schichten im Vergleich zum Ausgangszustand nachgewiesen werden. EB-umschmelzlegierte Schichten weisen im Ergebnis von Trockenverschleißtests (Stift-Scheibe) eine deutliche Reduzierung des spezifischen Verschleißkoeffizienten auf.

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Книги з теми "AZ91D"

Effect of Surface Modification of Magnesium Alloy AZ91D by Friction Stir Processing. Karur, India: ASDF International, 2017.

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Частини книг з теми "AZ91D"

Walukas, D. M., R. F. Decker, and A. W. Totten. "Effects of Beryllium Content in Thixomoldingr̀ AZ91D." In Magnesium Technology 2001, 95–98. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118805497.ch18.

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Zhang, Jin, Yan Ling Tao, and Zhi Fu Sun. "Microstructure of AZ91D in Different Treatment Conditions." In Materials Science Forum, 143–46. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.143.

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Liu, Z. Y., Qing Yan Xu, and Bai Cheng Liu. "Microstructure Simulation of Die Casting AZ91D Alloy." In Materials Science Forum, 109–12. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.109.

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Zhang, Y. K., Xiao Shi Hu, Kun Wu, and Ming Yi Zheng. "Application of G-L Dislocation Model in Low Frequency Damping Capacities of AZ91D and SiCw/AZ91D Composites." In Materials Science Forum, 495–98. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.495.

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Joshi, Utsavi, and Nadendla Hari Babu. "Effect of Al Addition on Microstructure of AZ91D." In Magnesium Technology 2014, 209–12. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888179.ch41.

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Joshi, Utsavi, and Nadendla Hari Babu. "Effect of Al Addition on Microstructure of AZ91D." In Magnesium Technology 2014, 209–12. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48231-6_41.

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Zhao, Hao Feng, Ling Wang, Sheng Li Guo, and Jun Yi Su. "On the Infiltration of Fiber Reinforced AZ91D Alloy." In Materials Science Forum, 437–38. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.437.

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Bai, Li Qun, Di Li, Min Guo, and Jing Xin. "Rare Earth Conversion Coating of Magnesium Alloy AZ91D." In Materials Science Forum, 555–58. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.555.

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Űnal, Ogün, and Murat Tiryakioǧlu. "Characterization of Tensile Deformation in AZ91D Mg Alloy Castings." In Shape Casting: 6th International Symposium, 117–24. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48166-1_15.

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ŰNal, Ogün, and Murat Tiryakioğlu. "Characterization of Tensile Deformation in AZ91D Mg alloy castings." In Shape Casting: 6th International Symposium, 117–24. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274865.ch15.

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Тези доповідей конференцій з теми "AZ91D"

Pinfold, Peter M. D., and Dåg Oymo. "An Evaluation of Refined, Recycled AZ91D Alloy." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1993. http://dx.doi.org/10.4271/930420.

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Suman, Chris. "Creep of Diecast Magnesium Alloys AZ91D and AM60B." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1991. http://dx.doi.org/10.4271/910416.

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Lan, Jie, and Xiaochun Li. "Magnesium Matrix Nano-Composite Fabricated by Ultrasonic Dispersion of Nano-Sized SiC Particles in Molten Magnesium Alloy." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61408.

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The use of ultrasonic nonlinear effects to disperse nano-sized ceramic particles in molten metal has been studied and nanosized SiC particle reinforced AZ91D magnesium composites were fabricated. The microstructure of the composites was investigated by high resolution scanning electron microscopy (SEM), X-ray photo spectroscopy (XPS) and high resolution X-Ray Diffractometer(XRD) techniques. Experimental results show a nearly uniform distribution and good dispersion of the SiC nanoparticles within the magnesium matrix, although some of small agglomerates (less than 300nm) were found in matrix. The microhardness of composites have been improved significantly compared to that of pure AZ91D. The ultrasonic fabrication methodology is striking to rapidly produce a wide range of nano-sized particles reinforced metal matrix composites.

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Murray, Morris T., Winston P. Sequeira, and Robert D'Allesandro. "Properties and Design of Castings in Magnesium Alloy AZ91D." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1996. http://dx.doi.org/10.4271/960420.

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Zhihong, Guo, Hou Hua, Zhao Yuhong, and Qu Shuwei. "Numerical Simulation of Squeeze Casting of AZ91D Magnesium Alloy." In 2010 International Conference on Digital Manufacturing and Automation (ICDMA). IEEE, 2010. http://dx.doi.org/10.1109/icdma.2010.239.

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Dasgupta, Rathindra, Phil Burton, and Zach Brown. "Microstructure and Mechanical Properties of Squeeze Cast AZ91D Magnesium Alloy." In SAE 2005 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-01-0330.

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Jacques, Richard P., Rathindra DasGupta, and Andrew G. Haerle. "Evaluation of Recycled AZ91D Magnesium Alloy for Steering Column Components." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1997. http://dx.doi.org/10.4271/970332.

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Shehata, M. T., V. Kao, E. Essadiqi, C. A. Loong, and C.-Q. Zheng. "Production and Die Casting of Semi-Solid Magnesium Alloy AZ91D." In SAE 2002 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-0082.

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Mao, H., J. Brevick, C. Mobley, V. Chandrasekar, D. Rodrigo, M. Murray, and R. Esdaile. "Microstructural Characteristics of Die Cast AZ91D and AM60 Magnesium Alloys." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1999. http://dx.doi.org/10.4271/1999-01-0928.

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Fan, Ding, Jianbin Zhang, Yufeng Zheng, and Qiang Li. "Laser cladding of AZ91D magnesium alloy with Ni-Si-Mg." In PICALO 2008: 3rd Pacific International Conference on Laser Materials Processing, Micro, Nano and Ultrafast Fabrication. Laser Institute of America, 2008. http://dx.doi.org/10.2351/1.5057161.

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