Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of Aging Treatment on the Microstructure and Tensile Properties of AZ61-xPd (x = 0, 1 and 2 wt%) Alloys

AZ61-xPd (x = 0, 1 and 2 wt%) Mg합금의 미세조직 및 인장특성에 미치는 열처리의 영향

  • Kim, Sang Hyun (Dept. of Materials Science and Engineering Pusan National University) ;
  • Kim, Byeong Ho (Dept. of Materials Science and Engineering Pusan National University) ;
  • Park, Kyung Chul (Dept. of Materials Science and Engineering Pusan National University) ;
  • Park, Yong Ho (Dept. of Materials Science and Engineering Pusan National University) ;
  • Park, Ik Min (Dept. of Materials Science and Engineering Pusan National University)
  • Received : 2012.03.07
  • Published : 2012.10.25
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Abstract

In this study, the effect of aging treatment on the microstructure and tensile properties of AZ61-xPd (x = 0, 1 and 2 wt%) alloys were investigated. The microstructure of as-cast AZ61-xPd alloys mainly consisted of ${\alpha}-Mg$, $Mg_{17}Al_{12}$ and $Al_4Pd$ phases. After solution treatment, most of the $Mg_{17}Al_{12}$ phases were dissolved into the Mg matrix. Thereafter, $Mg_{17}Al_{12}$ phases were finely formed and distributed near thermally stable $Al_4Pd$ phases and inside the grains through aging treatment at $220^{\circ}C$ during 88 hours. With the aging at $220^{\circ}C$, the peak aged AZ61-xPd alloys showed higher hardness than as-cast and solution treated AZ61-xPd alloys. In particular, the AZ61-1Pd alloy was optimized due to refined $Mg_{17}Al_{12}$ and $Al_4Pd$ phases. Further, the peak aging time was reduced with increasing Pd addition (>1 wt%). Tensile strength was increased by Pd addition at $25^{\circ}C$, $150^{\circ}C$, both as-cast and peak aged AZ61-xPd alloys. After aging treatment, room and high temperature tensile strength were increased more than the as-cast specimens. The AZ61-1Pd alloy especially showed the largest strength increase range. Elongation was decreased with addition Pd at $25^{\circ}C$ and $150^{\circ}C$.

Keywords

Acknowledgement

Supported by : 한국연구재단

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