Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Microstructure and Yield Asymmetry Behavior of Indirect-extruded Mg-Sn-Al-Zn Alloys

Mg-Sn-Al-Zn 마그네슘 합금 간접압출재의 미세조직 및 소성이방성

  • 박성혁 (한국기계연구원 부설 재료연구소) ;
  • 김영민 (한국기계연구원 부설 재료연구소) ;
  • 김하식 (한국기계연구원 부설 재료연구소) ;
  • 임창동 (한국기계연구원 부설 재료연구소) ;
  • 유봉선 (한국기계연구원 부설 재료연구소)
  • Received : 2012.06.28
  • Accepted : 2012.07.20
  • Published : 2012.08.01
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Abstract

Mg-(9-x)Sn-xAl-1Zn (x=1, 2, 3 and 4 wt.%) alloys were subjected to indirect extrusion, and the microstructure and mechanical properties of the as-extruded Mg-Sn-Al-Zn (TAZ) alloys were investigated. The TAZ 811 alloy exhibited a finer grain structure than the TAZ 541 alloy due to a larger number of Mg2Sn particles, which pinned the grain boundaries and prevented growth of recrystallized grains. The TAZ alloys showed an unusual yield asymmetry behavior. The tension-compression yield asymmetry increased with decreasing average grain size. The TAZ 811 alloy with a small grain size exhibited a larger yield asymmetry than that of the TAZ 541 alloy having a relatively large grain size, which is mainly attributed to the low Al content and large number of second phase particles in the TAZ 811 alloy.

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References

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