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Journal articles on the topic 'HPDC Al'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Qi, Ming Fan, Yong Lin Kang, and Quan Quan Qiu. "Industrialized Application of Rheo-HPDC Process for the Production of Large Thin-Walled Aluminum Alloy Parts." Solid State Phenomena 285 (January 2019): 453–58. http://dx.doi.org/10.4028/www.scientific.net/ssp.285.453.

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A simplified and efficient process, namely air-cooled stirring rod (ACSR), was proposed to prepare semisolid slurry of aluminum alloys. An advanced integrated rheological high pressure die-casting (Rheo-HPDC) technology was established by combining the ACSR equipment with HPDC machines to produce high quality aluminum alloy products. Microstructures, surface qualities, mechanical properties, corrosion resistances and thermal conductivities of the Al-8Si alloy parts prepared by Rheo-HPDC were investigated and compared to those prepared by traditional HPDC. The results indicated that the Rheo-HP

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2

Li, Qian, Mengmeng Hou, Junjie Ren, et al. "Co-delivery of chlorin e6 and doxorubicin using PEGylated hollow nanocapsules for ‘all-in-one’ tumor theranostics." Nanomedicine 14, no. 17 (2019): 2273–92. http://dx.doi.org/10.2217/nnm-2019-0099.

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Aim: Hollow mesoporous copper sulfide nanocapsules conjugated with poly(ethylene glycol) (PEG), doxorubicin and chlorin e6 (HPDC) were synthesized for fluorescence imaging and multimodal tumor therapy. Materials & methods: HPDC were synthesized by encapsulating chlorin e6 and doxorubicin into PEGylated nanocapsules via a simple precipitation method. The photothermal/photodynamic effects, drug release, cellular uptake, imaging capacities and antitumor effects of the HPDCs were evaluated. Results: This smart nanoplatform is stimulus-responsive toward an acidic microenvironment and near infra

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3

Zheng, Tianxu, Yaobo Hu, Wanqiu Meng, Aitao Tang, and Fusheng Pan. "Corrosion and Residual Strength Analysis of High Pressure Die Casting AM Series Mg Alloys." Materials 12, no. 16 (2019): 2624. http://dx.doi.org/10.3390/ma12162624.

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Higher pressure die casting (HPDC) AM series (Mg-Al-Mn) Mg alloys have wide application potential in the automobile industry. To promote its application, systematic investigation on the corrosion performance and corrosion residual strength of HPDC AM50+1Ce and AM60 was carried out. The corrosion of HPDC AM50+1Ce was more uniform, while the pitting corrosion of AM60 was more severe, and the mechanical properties of HPDC AM60 was more sensitive to corrosion. The residual strength of AM50+1Ce and AM60 after corrosion of 648 h was 199 MPa and 183 MPa, respectively. The findings can contribute to a

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4

Qi, Ming Fan, Yong Lin Kang, Guo Ming Zhu, Yang De Li, and Wei Rong Li. "A New Rheo-HPDC Process with Air-Cooled Stirring Rod Device for Wireless Base Station Shells of Al-8Si Alloy." Solid State Phenomena 256 (September 2016): 303–8. http://dx.doi.org/10.4028/www.scientific.net/ssp.256.303.

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A new process so-called air-cooled stirring rod (ACSR) was developed to prepare semisolid slurries of Al-8Si alloy. A simplified rheological high pressure die-casting (Rheo-HPDC) process was developed by combining the ACSR device with a HPDC machine to form wireless base station shells. Microstructures of slurries at different rotation speeds and air flows prepared by ACSR device were studied. Microstructures, mechanical properties and thermal conductivities of the shells formed by Rheo-HPDC were studied and compared with those produced by HPDC. The results indicate the ACSR device can prepare

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5

Tharumarajah, Ambavalavanar, Dayalan R. Gunasegaram, and Paul Koltun. "Greenhouse Gas Emissions Attributable to High Pressure Die Casting." Materials Science Forum 618-619 (April 2009): 21–26. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.21.

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In spite of die castings being amongst the highest volume items manufactured by the metalworking industry, the influence of high pressure die casting (HPDC) process parameters on greenhouse gas (GHG) emissions remains largely unreported. In this article, the authors discuss the effect of some HPDC process parameters on GHG emissions using cradle-to-gate life cycle assessment (LCA) for both aluminium and magnesium alloys. Although the impacts reduced with increasing yields in both cases, it was determined that the GHG impact of magnesium alloy HPDC was more sensitive to HPDC yield irrespective

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6

Ji, Shou Xun, Bo Jiang, Wen Chao Yang, and Zhong Yun Fan. "Melt Quenched High Pressure Die Casting (MQ-HPDC) of an A356 Alloy." Materials Science Forum 765 (July 2013): 195–99. http://dx.doi.org/10.4028/www.scientific.net/msf.765.195.

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Melt quenched high pressure die casting (MQ-HPDC) is a new die casting process developed recently for improving the casting quality of the conventional HPDC process. In the MQ-HPDC process, an alloy melt with a specified dose and superheat is quenched by directly pouring the alloy melt into a preheated metallic container. The thermal mass and preheating temperature of the container is selected so that the alloy melt is quenched just below the alloy liquidus and heterogeneous nucleation takes place during the melt quenching. The quenched alloy melt is then fed immediately into the shot sleeve f

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7

Sharma, Bharat. "Flash Prevention in HPDC." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (2021): 1902–9. http://dx.doi.org/10.22214/ijraset.2021.37661.

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Abstract: Welcome to steady die casting solutions. We are at steady die casting solutions keep on continue to give die casting solutions. In this paper we will discuss how we can predict flash location in die and how we can correct before die making or after die making. We also discuss how we can calculate individual tie bar load when we load a die, tie bar load will change on each die changeover because of it’s center of gravity. We discuss how casting shot centroid will effect tie bar load which directly responsible for flash. All this things we try to explain with an example, I hope it will

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8

Möller, Heinrich, Gonasagren Govender, and Waldo Stumpf. "Comparison of the Heat Treatment Response of Wrought and SSM-HPDC Alloy 6082." Materials Science Forum 690 (June 2011): 242–45. http://dx.doi.org/10.4028/www.scientific.net/msf.690.242.

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The natural and artificial aging responses of wrought and SSM-HPDC alloy 6082 are compared. It is shown that the heat treatment response of this Al-Mg-Si alloy is not influenced by differences in microstructures produced by different processing routes. Wrought alloy 6082 is known to experience an unfavourable effect of prior natural aging on the subsequent artificial aging response, which was also found for SSM-HPDC 6082 in this study. The tensile properties of SSM-HPDC 6082-T6 agree well with those specified for wrought 6082-T6, except for a much lower ductility of the SSM-HPDC variant.

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9

Negrotto, Soledad, Hebe A. Mena, Agustin E. Ure, et al. "Human Plasmacytoid Dendritic Cells Elicited Different Responses after Infection with Pathogenic and Nonpathogenic Junin Virus Strains." Journal of Virology 89, no. 14 (2015): 7409–13. http://dx.doi.org/10.1128/jvi.01014-15.

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The arenavirus Junin virus (JUNV) is the etiologic agent of Argentine hemorrhagic fever. We characterized the JUNV infection of human peripheral blood-derived plasmacytoid dendritic cells (hpDC), demonstrating that hpDC are susceptible to infection with the C#1 strain (attenuated) and even more susceptible to infection with the P (virulent) JUNV strain. However, hpDC elicited different responses in terms of viability, activation, maturation, and cytokine expression after infection with both JUNV strains.

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10

Cornacchia, Giovanna, Daniele Dioni, Michela Faccoli, et al. "Experimental and Numerical Study of an Automotive Component Produced with Innovative Ceramic Core in High Pressure Die Casting (HPDC)." Metals 9, no. 2 (2019): 217. http://dx.doi.org/10.3390/met9020217.

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Weight reduction and material substitution are increasing trends in the automotive industry. High pressure die casting (HPDC) is the conventional casting technology for the high volume production of light alloys; it has recently found wide application in the manufacturing of critical components, such as complex and thin geometry automotive parts. However, the major restriction of this affordable technology is the difficulty to design and realize hollow sections or components with undercuts. An innovative way to further increase the competitiveness of HPDC is to form complex undercut shaped par

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11

Liu, Lehua, Tao Zhang, Zhiyuan Liu, et al. "Near-Net Forming Complex Shaped Zr-Based Bulk Metallic Glasses by High Pressure Die Casting." Materials 11, no. 11 (2018): 2338. http://dx.doi.org/10.3390/ma11112338.

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Forming complex geometries using the casting process is a big challenge for bulk metallic glasses (BMGs), because of a lack of time of the window for shaping under the required high cooling rate. In this work, we open an approach named the “entire process vacuum high pressure die casting” (EPV-HPDC), which delivers the ability to fill die with molten metal in milliseconds, and create solidification under high pressure. Based on this process, various Zr-based BMGs were prepared by using industrial grade raw material. The results indicate that the EPV-HPDC process is feasible to produce a glassy

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12

Curle, Ulyate Andries, Heinrich Möller, and Gonasagren Govender. "R-HPDC in South Africa." Solid State Phenomena 192-193 (October 2012): 3–15. http://dx.doi.org/10.4028/www.scientific.net/ssp.192-193.3.

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The history of semi-solid metal forming and in particular rheo-high pressure die casting at the Council for Scientific and Industrial Research in South Africa is discussed. Processing flexibility is demonstrated on the Al-Si-Mg, Al-Mg-Si, Al-Cu-Mg and Al-Zn-Mg-Cu casting and wrought alloy systems as well as on high purity aluminium, unmodified Al-Si binary eutectic, metal matrix composites and magnesium alloys. Material properties are highlighted.

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13

Curle, Ulyate Andries, Jeremias D. Wilkins, and Gonasagren Govender. "R-HPDC of Magnesium Alloys." Solid State Phenomena 192-193 (October 2012): 225–30. http://dx.doi.org/10.4028/www.scientific.net/ssp.192-193.225.

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Flexibility of the Council for Scientific and Industrial Research’s Rheocasting System (CSIR-RCS) and its rheo-high pressure die casting (R-HPDC) technology is again demonstrated, as with aluminium alloys, by processing and shape casting of three different magnesium alloys (AM50A, AM60B, AZ91D) in a first attempt. All as-cast microstructures are characterised more by rosette shaped globules of the primary-(Mg) phase together with Mg17Al12 as evidence of non-equilibrium cooling rates. Surface liquid segregation is observed in the as-cast microstructure for all three alloys. Minor alloy addition

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14

Jiang, Wei, Zhanyi Cao, Liping Liu, and Bo Jiang. "Effect of Gas Pores on Mechanical Properties of High-Pressure Die-Casting AM50 Magnesium Alloy." Microscopy and Microanalysis 22, no. 4 (2016): 814–19. http://dx.doi.org/10.1017/s1431927616011375.

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AbstractHigh-pressure die-casting (HPDC) AM50 tensile specimens were used to investigate characteristics of gas pores and its effect on mechanical properties of HPDC AM50 magnesium alloy. Combining microstructure morphology gained from optical microscopy, scanning electron microscopy (SEM), and three-dimensional (3D) reconstruction with the experimental data from uniaxial tensile testing, we pursued the relationship between gas pores and the mechanical properties of HPDC AM50 Mg alloy. Results indicate that comparing with 3D reconstruction models, 2D images like optical metallography images an

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15

Szymczak, Tomasz, Grzegorz Gumienny, Leszek Klimek, Marcin Goły, Jan Szymszal, and Tadeusz Pacyniak. "Characteristics of Al-Si Alloys with High Melting Point Elements for High Pressure Die Casting." Materials 13, no. 21 (2020): 4861. http://dx.doi.org/10.3390/ma13214861.

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This paper is devoted to the possibility of increasing the mechanical properties (tensile strength, yield strength, elongation and hardness) of high pressure die casting (HPDC) hypoeutectic Al-Si alloys by high melting point elements: chromium, molybdenum, vanadium and tungsten. EN AC-46000 alloy was used as a base alloy. The paper presents the effect of Cr, Mo, V and W on the crystallization process and the microstructure of HPDC aluminum alloy as well as an alloy from the shell mold. Thermal and derivative analysis was used to study the crystallization process. The possibility of increasing

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16

Chauke, Levy, Heinrich Möller, Ulyate Andries Curle, and Gonasagren Govender. "Anodising of Al-Mg-Si-(Cu) Alloys Produced by R-HPDC." Materials Science Forum 765 (July 2013): 658–62. http://dx.doi.org/10.4028/www.scientific.net/msf.765.658.

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Anodising of aluminium alloys can be used to improve corrosion resistance during application or it can be simply for decorative purposes. In this research, anodising of 6111 (Cu containing) and 6082 (without Cu) alloys produced by Rheo-High Pressure Die Casting (R-HPDC) was studied. R-HPDC components suffer from surface liquid segregation (SLS), the surface layer of the casting is enriched in alloying elements and it is expected to have different properties than the bulk material. An advantage of R-HPDC is that traditional wrought alloys such as the 6xxx series can be cast into near-net shape.

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17

Egger, Christoph, Florian Grünbart, Zahra Silvayeh, et al. "Mechanical Properties of Selective Laser-Melted Components of Alsi10mg for Prototype Vehicles." Materials Science Forum 1016 (January 2021): 399–406. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.399.

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Fabrication of aluminum alloy components by traditional high-pressure die casting (HPDC) requires cost- and time-consuming tooling of steel dies, which makes HPDC uneconomic for producing low-volume components or prototypes. In comparison, powder bed-based additive manufacturing, e.g. selective laser melting (SLM), enables rapid prototyping and production of even complex-shaped components directly from computer-aided design models without needing expensive tools. However, SLM prototype components must have almost identical mechanical properties to HPDC serial components in order to emulate the

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18

Liu, Shuo, Chang-Ho Jeong, and Myoung-Souk Yeo. "Effect of Evaporator Position on Heat Pump Assisted Solid Desiccant Cooling Systems." Energies 13, no. 22 (2020): 5918. http://dx.doi.org/10.3390/en13225918.

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The packaged terminal air conditioning with reheat (PTACR) system, as a commonly used dehumidification system, faces the problem of extra energy consumption in the deep-cooling and reheating processes. Therefore, different heat pump assisted hybrid solid desiccant cooling (HPDC) systems were proposed and their characteristics were investigated via EnergyPlus simulations. The system energy efficiency presents an upward trend with the increase in outdoor temperature and humidity. A high-humidity climate leads to the improvement of system performance. The dehumidification performance of the desic

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19

Lumley, Roger. "Design of Secondary Alloy Compositions for High Performance Aluminium Pressure Diecastings." Materials Science Forum 693 (July 2011): 247–55. http://dx.doi.org/10.4028/www.scientific.net/msf.693.247.

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High pressure die-casting (HPDC) is a widely used production technique for metal components that are required to have close dimensional tolerances and smooth surface finishes. Approximately 50% of the aluminium castings produced globally are manufactured by HPDC from secondary alloy and these are dominant in the automotive sector where they account for the majority of aluminium components present in each vehicle manufactured. Recently, it has been shown that industrially produced aluminium alloy high pressure diecastings (HPDC’s) can be successfully heat treated without encountering problems w

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20

Winarto, Winarto, and Ediyanto Ediyanto. "ANALISIS PERHITUNGAN NILAI OVERALL EQUIPMENT EFFECTIVENESS (OEE) SEBAGAI DASAR UNTUK PERBAIKAN DI MESIN HIGH PRESSURE DIE CASTING MENGGUNAKAN PENDEKATAN LEAN MANUFACTURING (STUDI KASUS PADA PT ASTRA OTOPARTS TBK DIVISI NUSAMETAL)." Jurnal Ilmiah Manajemen dan Bisnis 5, no. 1 (2019): 126. http://dx.doi.org/10.22441/jimb.v5i1.5630.

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Penelitian ini dilatarbelakangi adanya biaya lembur sebesar Rp 4,28 milyar di mesin HPDC selama periode Januari – Oktober 2014 di mana menurut perhitungan PPIC kapasitas produksi mencukupi tanpa adanya lembur. Penelitian ini bertujuan mengevaluasi kinerja mesin High Pressure Die Casting (HPDC) di PT Astra Otoparts Tbk Divisi Nusametal apakah sudah mencapai perusahaan kelas dunia sesuai visi perusahaan. Penelitian ini menggunakan pendekatan deskriptif. Teknik analisis secara kuantitatif menggunakan metode analisis nilai Overall Equipment Effectiveness (OEE). Dari hasil perhitungan nilai OEE aka

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21

Cao, Wen Jiong, Zhao Yao Zhou, Yi He, and Yuan Biao Wu. "Numerical Simulation of Back Pressure Influenced Aluminum Component’s HPDC Process." Advanced Materials Research 139-141 (October 2010): 549–52. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.549.

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Due to the flow behavior of molten metal is affected by the back pressure of mold residual air in high pressure die casting (HPDC) process, the back pressure conditions should be considered in order to simulate the HPDC process precisely. In this study, an aluminum colander of automobile’s filling process in HPDC was calculated by combining the back pressure conditions. The optimized schemes were given by considering the simulation results. Both initial and optimized schemes simulation results were compared with actual parts. The contribution of gas porosity between simulation and actual part

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22

Ignaszak, Zenon, and Jakub Hajkowski. "Gas- and Shrinkage Porosities in Al-Si High-Pressure Die-Castings - Virtualization and Experimental Validation." Defect and Diffusion Forum 364 (June 2015): 80–91. http://dx.doi.org/10.4028/www.scientific.net/ddf.364.80.

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The porosity (void caused by technological reasons) in engineering materials always decrease their mechanical characteristics and usually affects the deterioration of the functional mechanical characteristics of the finished products. In the castings the porosity resulting from the specific casting processes phenomena occurs inevitably in the matrix structure. The paper shows this problem in relation to the High-Pressure-Die-Casting (HPDC) technology of Al-Si alloy. The analysis of the experimental results and the results from virtualization of HPDC process allowed to assess the effectiveness

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23

Chauke, Levy, Heinrich Möller, and Gonasagren Govender. "Anodising of Aluminium Alloy Plates from Different Series Produced by Rheo-High Pressure Die Casting." Solid State Phenomena 217-218 (September 2014): 247–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.217-218.247.

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Anodising of aluminium alloy components can be used for decorative purposes and to enhance the corrosion and wear resistance. In this research, four different Al-alloy series namely Al-Cu-Mg (2xx/2xxx), Al-Si-Mg (3xx), Al-Mg-Si (6xxx) and Al-Zn-Mg-Cu (7xxx) were used to produce plates by rheo-high pressure die casting (R-HPDC). Castings produced by R-HPDC suffer from a surface liquid segregation (SLS) phenomena. This surface layer is enriched with alloying elements and it is shown to have different characteristics as compared to the bulk material. The study focused on the anodisability of plat

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24

Duan, Hui Zhen, Jiang Nan Shen, and Yan Ping Li. "Comparative Analysis of HPDC Process of an Auto Part with ProCAST and FLOW-3D." Applied Mechanics and Materials 184-185 (June 2012): 90–94. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.90.

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The high pressure die casting (HPDC) process of an ADC12 aluminum alloy auto part is researched by the software ProCAST and FLOW-3D, respectively. The possible HPDC defects of the auto part are analyzed. The difference of the filling process with the same technological parameter is studied. Compared with the simulation result of ProCAST, FLOW-3D software simulation result is closer to the die casting of the actual production.

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Lumley, Roger N., Robert G. O'Donnell, Dayalan R. Gunasegaram, and Michel Givord. "Blister Free Heat Treatment of High Pressure Die-Casting Alloys." Materials Science Forum 519-521 (July 2006): 351–58. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.351.

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Conventionally produced high pressure die-cast (HPDC) components are not considered to be heat treatable because gases entrapped during the die-casting process expand during solution treatment causing unacceptable surface blistering. Components may also become dimensionally unstable. Both these effects prevent the heat treatment of die-castings as these phenomena are detrimental to the visual appearance, mechanical properties and utilisation of the component. Recent work has revealed a process window in which HPDC aluminium alloys that are capable of responding to age hardening may be successf

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26

Szalva, Péter, and Imre Norbert Orbulov. "Influence of Vacuum Support on the Fatigue Life of AlSi9Cu3(Fe) Aluminum Alloy Die Castings." Journal of Materials Engineering and Performance 29, no. 9 (2020): 5685–95. http://dx.doi.org/10.1007/s11665-020-05050-y.

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Abstract High-pressure die casting (HPDC) is a near-net-shape process that produces high quality castings with narrow dimensional tolerances. The HPDC castings are being increasingly used due to good flexibility and high productivity, especially for the automotive industry. Depending on the location of the cast components, there are ever more complex geometries and increasing strength requirements that can be achieved by the application of vacuum-assisted die casting (VPDC). The most specific features of the HPDC process are the rapid mold filling, high cooling rate and intensification pressur

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27

Daswa, Pfarelo, Heinrich Möller, Madeleine du Toit, and Gonasagren Govender. "The Solution Heat Treatment of Rheo-High Pressure Die Cast Al-Mg-Si-(Cu) 6xxx Series Alloys." Solid State Phenomena 217-218 (September 2014): 259–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.217-218.259.

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The 6xxx series alloys are well known for desirable combinations of high strength, weldability, corrosion resistance and formability. This paper investigates the influence of chemical composition on the solution heat treatment parameters of rheo-high pressure die cast (R-HPDC) 6xxx series aluminium alloys. The presence of copper in the 6xxx series aluminium alloys affects the solution heat treatment by promoting incipient melting. The incidence of incipient melting is investigated for the R-HPDC alloys using Differential Scanning Calorimetry (DSC) and optical microscopy. R-HPDC is known to pro

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28

Lumley, Roger N. "A Preliminary Evaluation on the Fracture Toughness of Heat Treated Aluminium High Pressure Diecastings." Advanced Materials Research 41-42 (April 2008): 141–46. http://dx.doi.org/10.4028/www.scientific.net/amr.41-42.141.

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Until recently, the solution heat treatment of conventional aluminum high pressure die cast (HPDC) parts has been considered impractical because the high temperatures involved cause surface blistering and dimensional instability. Now, a new heat treatment procedure has been developed by the CSIRO Light Metals Flagship in Australia which avoids these problems and, in many cases, allows tensile properties such as 0.2% proof stress to be doubled with little change to ductility. This development has the potential to reduce costs by allowing existing HPDC parts to be re-designed to use less metal a

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Otarawanna, Somboon, Christopher M. Gourlay, Hans Ivar Laukli, and Arne K. Dahle. "The Influence of Intensification Pressure on the Gate Microstructure of AlSi3MgMn High Pressure Die Castings." Materials Science Forum 618-619 (April 2009): 607–10. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.607.

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This article focuses on the influence of intensification pressure (I.P.) on the feeding through the gate during high pressure die casting (HPDC). Two values of intensification pressure, the lowest and highest possible for the HPDC machine used, were applied to cast AlSi3MgMn tensile-bar specimens. The castings produced with higher I.P. contained a lower total fraction of porosity, as expected. Microstructural characterisation of the gate region showed markedly different features in and adjacent to the gate at the two levels of I.P. used. The microstructures indicate a change in feeding mechani

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30

Pereira, Filipe. "Operational Cost Analysis of a Typical South African High Pressure Die-Casting Business." Advanced Materials Research 1019 (October 2014): 152–59. http://dx.doi.org/10.4028/www.scientific.net/amr.1019.152.

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This paper looks at the issue and influence of the die cost on a typical Aluminium die casting business. High pressure die casting (HPDC) is a manufacturing process used to produce components in a near finished shape with a reasonable good surface aspect, dimensionally accurate and within a short period off time or production cycle. The die is at the heart of the HPDC business and is unique to each component to be produced. A full business analysis was done and the full die cost share was extracted as part of a life cycle inventory of the HPDC manufacturing process. The inventory accounted for

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Jiang, Wei, Zhanyi Cao, Xu Sun, and Haifeng Liu. "Three-Dimensional Microstructure Reconstruction and Finite Element Simulation of Gas Pores in the High-Pressure Die-Casting AZ91 Mg Alloy." Microscopy and Microanalysis 21, no. 6 (2015): 1420–25. http://dx.doi.org/10.1017/s1431927615015172.

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AbstractHigh-pressure die-casting (HPDC) AZ91 tensile specimens were used to investigate characteristics of gas pores and their effects on mechanical properties of HPDC AZ91 magnesium (Mg) alloy. Combining the stereoscopic morphology of gas pores obtained from a three-dimensional (3D) reconstruction technique with the experimental data from uniaxial tensile testing, we worked on finite element simulation to find the relationship between gas pores and the mechanical properties of HPDC AZ91 Mg alloy. Results indicate that the 2D metallography images have one-sidedness. Moreover, gas pores >10

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Haitao, Xu, Zheng Nengwu, Xu Hanhui, et al. "The study on single crystal structure of [Zn(Hpdc)2(H2O)2]·2H2O (Hpdc−=2,5-pyridinedicarboxylic acid group)." Journal of Molecular Structure 597, no. 1-3 (2001): 1–5. http://dx.doi.org/10.1016/s0022-2860(01)00573-7.

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Cao, Wen Jiong, Shou Bin Dong, Xin Wei Lu, and Zhao Yao Zhou. "Numerical Simulation of Filling Process in HPDC by Lattice Boltzmann Method." Advanced Materials Research 717 (July 2013): 354–58. http://dx.doi.org/10.4028/www.scientific.net/amr.717.354.

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A general lattice Boltzmann Method (LBM) to simulate filling process of high pressure die casting (HPDC) is investigated. Boundary conditions are studied and the free surface model is established by combine the LBM with VOF method. The final model was substantiated by simulating filling process in HPDC in three dimensions. The simulated results from LBM and finite difference method (FDM) were compared with the experiments. The results show the former is in a better agreement with experiments. It demonstrates the efficiency and precision of this LBM model in describing flow pattern in filling p

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Nguyen, Thang, Vu Nguyen, Morris Murray, Gary Savage, and John Carrig. "Modelling Die Filling in Ultra-Thin Aluminium Castings." Materials Science Forum 690 (June 2011): 107–11. http://dx.doi.org/10.4028/www.scientific.net/msf.690.107.

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This work aims to develop flow and thermal control methods for the high pressure die casting (HPDC) of very thin-walled aluminium components where thicknesses are predominantly less than 1 mm. One specific aim includes developing advanced modelling capability using CFD software to predict the complex structure of the metal flow in the die and the casting solidification. The modelling based on FLOW-3D started initially with a fluidity die study to establish several key parameters in HPDC modelling through experimental validation. A new test casting geometry has been designed in the form of a sh

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Wang, Meng, Yan Da Zou, Henry Hu, Gary Meng, Patrick Cheng, and Yeou Li Chu. "Tensile Properties and Microstructure of Joined Vacuum Die Cast Aluminum Alloy A356 (T6) and Wrought Alloy 6061." Advanced Materials Research 939 (May 2014): 90–97. http://dx.doi.org/10.4028/www.scientific.net/amr.939.90.

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In the present work, fusion-joining of vacuum high pressure die cast (HPDC) aluminum alloy A356 and wrought alloy 6061 by applying Gas Metal Arc Welding (GMAW-MIG) process was investigated to understand the effect of the MIG process on the microstructure and tensile behaviors of the base joined alloys (T6 Heat treatment A356 and 6061). The microstructures of the base metal (T6 heat treatment A356 and 6061), Heat Affected Zone (HAZ) and Fusion Zone (filler metal ER4043) were analyzed by Scanning Electron Microscopy (SEM) and optical microscopy. The results of tensile testing indicated that, the

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Yan, Hong, Yong Hu, and Xiao Quan Wu. "Study on Rheo-Diecasting for In Situ Synthesized Mg₂Si/AM60 Composites." Advanced Materials Research 383-390 (November 2011): 707–11. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.707.

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Magnesium alloys have high specific strength, specific stiffness, excellent thermal conductivity and casting properties, which have a great prospects development in the industry, However, its low plasticity and ductility limited its application. Magnesium matrix composites can effectively improve its performance. Magnesium alloy die-casting is the main forming process, the conventional high-pressure die-casting (HPDC) defects in multi-cavity type, easy to volume gas, non-heat-treated. Compared with HPDC, the rheo-diecasting (RDC) process has been greatly developed for near-net shape components

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Chauke, Levy, Pfarelo Daswa, Heinrich Möller, and Gonasagren Govender. "The Effect of Natural Pre-Ageing on the Mechanical Properties of Rheo-High Pressure Die Cast Aluminium Alloy 2139." Materials Science Forum 828-829 (August 2015): 244–49. http://dx.doi.org/10.4028/www.scientific.net/msf.828-829.244.

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Near-net shape casting of wrought aluminium alloys has proven to be difficult due to hot tearing. The Council for Scientific and Industrial Research (CSIR) has successfully processed wrought aluminium alloy 2139 into plate castings using the Rheo-high pressure die casting process (R-HPDC). Alloy 2139 is a Ag-containing aluminium alloy from the Al-Cu-Mg 2xxx series family. The addition of Ag enhances the age hardening response through the formation of co-clusters that act as precursors to the formation of plate-like Ω precipitates. These co-clusters typically form during natural ageing and 12-2

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Ignaszak, Z., and J. Hajkowski. "Contribution to the Identification of Porosity Type in AlSiCu High-Pressure-Die-Castings by Experimental and Virtual Way." Archives of Foundry Engineering 15, no. 1 (2015): 143–51. http://dx.doi.org/10.1515/afe-2015-0026.

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Abstract The paper concerns the problem of discontinuity in high pressure die castings (HPDC). The compactness of their structure is not perfect, as it is sometimes believed. The discontinuities present in these castings are the porosity as follow: shrinkage and gas (hydrogen and gas-air occlusions) origin. The mixed gas and shrinkage nature of porosity makes it difficult to identify and indicate the dominant source. The selected parameters of metallurgical quality of AlSi9Cu3 alloy before and after refining and the gravity castings samples (as DI - density index method), were tested and evalu

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Queudeville, Yann, Todor Ivanov, Christopher Nußbaum, Uwe Vroomen, and Andreas Bührig-Polaczek. "Decision and Design Methodologies for the Lay-Out of Modular Dies for High-Pressure-Die-Cast-Processes." Materials Science Forum 618-619 (April 2009): 345–48. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.345.

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Within the project “Decision and design methodology for the lay-out of modular dies” which is part of the Cluster of Excellence “Integrative Production Technology for High-Wage Countries”, established and financed by the German Research Foundation (DFG), the main objective is setting guidelines for cost-effective and high quality high pressure die casting (HPDC) moulds. The strong increase in product variants and the growing demand for individualised products results in a growing complexity of all related products. The main objective of this project is bridging the existing gap between individ

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Zhu, Su Ming, Mark A. Gibson, Jian Feng Nie, Mark Easton, and C. J. Bettles. "On the Creep Resistance of HPDC Mg-RE Based Alloys." Materials Science Forum 618-619 (April 2009): 453–58. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.453.

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This paper presents an analysis, based on microstructural observations by transmission electron microscopy, of the influence of chemical composition on creep resistance of high pressure die casting (HPDC) Mg-4RE-0.6Zn alloys. The improved creep resistance, by increasing the Nd/La ratio of the rare earth (RE) mixture, is shown to be associated with the supersaturation of Nd solute in the -Mg matrix, evidenced by the formation of Nd-rich precipitates on dislocations after a thermal ageing treatment. The result indicates that solid solution/precipitation strengthening of the -Mg matrix is impor

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Lumley, Roger N., Maya Gershenzon, and Dayalan R. Gunasegaram. "Alloy Design for Enhancing the Fracture Resistance of Heat Treated High Pressure Die-Castings." Materials Science Forum 654-656 (June 2010): 954–57. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.954.

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Recently, heat treatment technologies have been developed by the CSIRO Light Metals Flagship in Australia that allow the 0.2% proof stress of conventional aluminum alloy high pressure diecastings (HPDC’s) to be more than doubled without encountering problems with blistering or dimensional instability [1,2]. A range of other properties may also be improved such as fatigue resistance, thermal conductivity and fracture resistance. However, the current commercial HPDC Al-Si-Cu alloys have not been developed to exploit heat treatment or to optimize these specific mechanical properties, and one pote

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Daswa, Pfarelo, Heinrich Möller, and Gonasagren Govender. "Optimization of the Solution Heat Treatment of Rheo-High Pressure Die Cast Al-Cu-Mg-Ag 2139 Alloy." Materials Science Forum 828-829 (August 2015): 226–31. http://dx.doi.org/10.4028/www.scientific.net/msf.828-829.226.

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This paper investigates the optimization of the solution heat treatment parameters of the rheo-high pressure die cast (R-HPDC) 2139 aluminium alloy. Differential Scanning Calorimetry (DSC) and optical microscopy were used to investigate the incidence of incipient melting and therefore determine suitable solution heat treatment temperatures. A three-step solution heat treatment where the alloy was heat treated from 400°C to 513°C using controlled heating conditions and held at 513°C for 2 hours and finally heated up from 513°C to 525°C and held there for 16 hours was done. R-HPDC is known to pr

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Lumley, Roger N., and J. R. Griffiths. "Fatigue Resistance of Heat Treated Aluminium High Pressure Die-Castings." Advanced Materials Research 41-42 (April 2008): 99–104. http://dx.doi.org/10.4028/www.scientific.net/amr.41-42.99.

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High pressure die-casting (HPDC) is widely used as a cost-effective way to massproduce metal components that are required to have close dimensional tolerances and smooth surface finishes. Approximately 50%, by mass, of the aluminium castings produced worldwide are made by this manufacturing route. However, HPDC components are relatively porous compared with other types of castings and so cannot usually be conventionally heat treated to improve mechanical properties. This follows because during solution treatment (e.g. at 540°C for 8h), the pores expand, resulting in unacceptable surface bliste

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Shah, Mittal, Asher Maroof, Panos Gikas, et al. "Dual neutralisation of IL-17F and IL-17A with bimekizumab blocks inflammation-driven osteogenic differentiation of human periosteal cells." RMD Open 6, no. 2 (2020): e001306. http://dx.doi.org/10.1136/rmdopen-2020-001306.

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ObjectivesInterleukin (IL)-17 signalling has been shown to be a key regulator of disease in ankylosing spondylitis (AS) with several IL-17 blockers currently clinically approved. Despite this, the role of IL-17 in bone pathology is poorly understood. This study aimed to investigate IL-17 signalling in the context of pathological bone formation.MethodsA biomimetic human periosteum-derived cell (hPDC) model of osteogenic differentiation was used in combination with recombinant IL-17 cytokines, T-cell supernatants or serum from patients with AS. IL-17A, IL-17F and bimekizumab monoclonal antibodie

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Choukri, Korti Mohammed, Korti Abdel Illah Nabil, and Abboudi Said. "Effects of shot sleeve filling in HPDC machine." Multidiscipline Modeling in Materials and Structures 15, no. 6 (2019): 1255–73. http://dx.doi.org/10.1108/mmms-04-2019-0067.

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Purpose High-pressure die casting is one of the manufacturing techniques used for the rational mass production of metal parts. Due to the high velocity of the molten metal during the injection phase, the die casting of aluminum is so complex and it is almost impossible to calculate these exact performances. Numerical simulation is an effective way to optimize the injection phase and minimize air entrapment that causes porosity defects in the metal. Generally, the filling phase of the molten metal in the shot sleeve is neglected in most scientific work. This phase is followed by a rest period t

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Barbagallo, S., H. I. Laukli, O. Lohne, and E. Cerri. "Divorced eutectic in a HPDC magnesium–aluminum alloy." Journal of Alloys and Compounds 378, no. 1-2 (2004): 226–32. http://dx.doi.org/10.1016/j.jallcom.2003.11.174.

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Wolski, Rich, and Henri Bal. "Special Issue Featuring Selected Papers from HPDC-15." Journal of Grid Computing 5, no. 2 (2007): 127–28. http://dx.doi.org/10.1007/s10723-007-9079-3.

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Dieringa, Hajo, Daniela Zander, and Mark A. Gibson. "Creep Behaviour Under Compressive Stresses of Calcium and Barium Containing Mg-Al-based Die Casting Alloys." Materials Science Forum 765 (July 2013): 69–73. http://dx.doi.org/10.4028/www.scientific.net/msf.765.69.

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The development of creep resistant high pressure die casting (HPDC) alloys is one of the main focuses in magnesium research. Alloying elements like rare earths, calcium, strontium or scandium added to the necessary aluminium for die casting have already been introduced. Newly developed barium containing magnesium alloys with three levels of alloying additions were processed via HPDC and their compression creep response at 200 °C was evaluated. DieMag633 (Mg-6Al-3Ba-3Ca) displays the best creep resistance followed by DieMag422 (Mg-4Al-2Ba-2Ca) and then DieMag211 (Mg-2Al-1Ba-1Ca). Stress exponen

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Martínez, Hader V., M. F. Valencia, Alejandro Morales, Andres F. Duque, Mauricio Arroyave, and J. Cruz. "One-Step SSM Process by MSC & HPDC for Metallic Components." Solid State Phenomena 141-143 (July 2008): 103–8. http://dx.doi.org/10.4028/www.scientific.net/ssp.141-143.103.

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The preliminary experimental results on microstructure evolution and simulation of an alternative semisolid route to manufacture near-net shape components are reported. The rheocasting for semi-solid alloys was first performed by conventional mechanical stircasting (MSC), followed by direct shaping of the SSM slurry into a high-pressure die-casting machine (HPDC), thus avoiding the storage and reheated to the semisolid state of the ingots prior the shaping process. To assure high quality for the semisolid slurry, the microstructural evolution was characterized by digital image analyses. The HP

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Sun, Zixi, Xinyu Geng, Luyang Ren, and Henry Hu. "Microstructure, Tensile Properties and Fracture Behavior of HPDC Magnesium Alloy AZ91." International Journal of Materials, Mechanics and Manufacturing 8, no. 2 (2020): 50–56. http://dx.doi.org/10.18178/ijmmm.2020.8.2.483.

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