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http://dx.doi.org/10.3365/KJMM.2012.50.10.711

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

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)
Publication Information
Korean Journal of Metals and Materials / v.50, no.10, 2012 , pp. 711-720 More about this Journal
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
magnesium alloy; aging; microstructure hardness; tensile test;
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