- Surface Treatment of Mg95Zn4.3Y0.7 Alloy Powder Consolidates using Plasma Electrolytic Oxidation
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J.H. Kim, H.S. Choi, D.H. Kim, D.Y. Hwang, H.S. Kim, T.S. Kim
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J Korean Powder Metall Inst. 2008;15(2):95-100.
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DOI: https://doi.org/10.4150/KPMI.2008.15.2.095
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 Abstract
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- The investigation is to modify the mechanical and chemical properties of Mg alloys using a combination of rapid solidification and surface treatment. As the first approach, Mg_95Zn_4.3Y_0.7 was gas atomized and pressure sintered by spark plasma sintering process (SPS), showing much finer microstructure and higher strength than the alloys as cast. Further modification was performed by treating the surface of PM Mg specimen using Plasma electrolytic oxidation (PEO) process. During the PEO processing, MgO layer was initiated to form on the surface of Mg powder compacts, and the thickness and the density of MgO layer were varied with the reaction time. The thickening rate became low with the reaction time due to the limited diffusion rate of Mg ions. The surface morphology, corrosion behavior and wear resistance were also discussed.
- Consolidation Behavior of Ti-6Al-4V Powder by Spark Plasma Sintering
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J.H. Kim, J.K. Lee, T.S. Kim
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J Korean Powder Metall Inst. 2007;14(1):32-37.
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DOI: https://doi.org/10.4150/KPMI.2007.14.1.032
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Abstract
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- Using spark plasma sintering process (SPS), Ti-6Al-4V alloy powders were successfully consolidated without any contamination happened due to reaction between the alloy powders and graphite mold. Variation of microstructure and mechanical properties were investigated as a function of SPS temperature and time. Compared with hot isostatic pressing (HIP), the sintering time and temperature could be lowered to be 10 min. and 900°C, respectively. At the SPS condition, UTS and elongation were about 890 MPa and 24%, respectively. Considering the density of 98.5% and elongation of 24%, further improving the tensile strength would obtain by increasing the SPS pressure.
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