Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Consolidation and Mechanical Behavior of Gas Atomized MgZn4.3Y0.7 Alloy Powders using High Pressure Torsion

고압비틀림 공정을 통한 급속응고 MgZn4.3Y0.7 합금 분말의 치밀화 및 기계적 거동

  • Yoon, Eun-Yoo (Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology)) ;
  • Chae, Hong-Jun (Eco-Materials and Processing department, Korea Institute of Industrial Technology) ;
  • Kim, Taek-Soo (Eco-Materials and Processing department, Korea Institute of Industrial Technology) ;
  • Lee, Chong-Soo (Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology)) ;
  • Kim, Hyoung-Seop (Department of Materials Science and Engineering, POSTECH (Pohang University of Science and Technology))
  • 윤은유 (포항공과대학교 신소재공학과) ;
  • 채홍준 (한국생산기술연구소 에코공정연구부) ;
  • 김택수 (한국생산기술연구소 에코공정연구부) ;
  • 이종수 (포항공과대학교 신소재공학과) ;
  • 김형섭 (포항공과대학교 신소재공학과)
  • Received : 2010.03.12
  • Accepted : 2010.04.26
  • Published : 2010.06.28
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Abstract

In this paper, rapid solidified Mg-4.3Zn-0.7Y (at.%) alloy powders were prepared using an inert gas atomizer, followed by a severe plastic deformation technique of high pressure torsion (HPT) for consolidation of the powders. The gas atomized powders were almost spherical in shape, and grain size was as fine as less than $5\;{\mu}m$ due to rapid solidification. Plastic deformation responses during HPT were simulated using the finite element method, which shows in good agreement with the analytical solutions of a strain expression in torsion. Varying the HPT processing temperature from ambient to 473 K, the behavior of powder consolidation, matrix microstructural evolution and mechanical properties of the compacts was investigated. The gas atomized powders were deformed plastically as well as fully densified, resulting in effective grain size refinements and enhanced microhardness values.

Keywords

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