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Fabrication and Properties of High Strength Hypereutectic AI-Si Powders by a Gas Atomization Process II. Extrusion and Mechanical Properties

가스분무 공정에 의한 고강도 과공정 AI-Si 합금 분말의 제조 및 특성연구 II. 압출재 제조 및 기계적 특성

  • Kim, Yong-Jin (Department of Powder Materials Research, Korea Institute of Materials Science) ;
  • Kim, Jin-Chun (School of Materials Science and Engineering, University of Ulsan)
  • 김용진 (한국기계연구원 부설 재료기술연구소 분말재료연구센터) ;
  • 김진천 (울산대학교 첨단소재공학부)
  • Published : 2008.04.28

Abstract

The hypereutectic Al-20 wt%Si powders including some amount of Cu, Fe, Mg, Mn were prepared by a gas atomization process. In order to get highly densified Al-Si bulk specimens, the as-atomized and sieved powders were extruded at $500^{\circ}C$, Microstructure and tensile properties of the extruded Al-Si alloys were investigated in this study. Relative density of the extruded samples was over 98%. Ultimate tensile strength (UTS) in stress-strain curves of the extruded powders increased after T6 heat treatments. Elongation of the samples was also increased from 1.4% to 3.2%. The fracture surfaces of the tested pieces showed a fine microstructure and the average grain size was about $1{\mu}m$.

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References

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