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Vol.50, No.10, 711 ~ 721, 2012
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| Title |
| Effect of Aging Treatment on the Microstructure and Tensile Properties of AZ61-xPd (x = 0, 1 and 2 wt %) Alloys |
| 김상현 Sang Hyun Kim , 김병호 Byeong Ho Kim , 박경철 Kyung Chul Park , 박용호 Yong Ho Park , 박익민 Ik Min Park |
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| Abstract |
| 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 α-Mg, Mg17Al12 and Al4Pd phases. After solution treatment, most of the Mg17Al12 phases were dissolved into the Mg matrix. Thereafter, Mg17Al12 phases were finely formed and distributed near thermally stable Al4Pd phases and inside the grains through aging treatment at 220℃ during 88 hours. With the aging at 220℃, 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 Mg17Al12 and Al4Pd phases. Further, the peak aging time was reduced with increasing Pd addition (>1 wt %). Tensile strength was increased by Pd addition at 25℃, 150℃, 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℃ and 150℃. |
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| Key Words |
| Magnesium alloy, aging, microstructure hardness, tensile test |
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