pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (37권4호 101-107)
The Effect of Pd addition on Mechanical Properties at High Temperature of Mg-4Al-2Sn Alloy
Mg-4Al-2Sn 합금의 고온 기계적 특성에 미치는 Pd첨가의 영향
Si-On Yim†, Byoung-Soo Kang, Dae-Hyun Cho* and Ik-Min Park*
1st Naval Sea Systems Team, Defense Agency for Technology and Quality,*Department of Materials Science and Engineering, Pusan National University
This study investigated the effect of Pd on the microstructure, tensile and creep properties of Mg-4Al-2Sn (AT42) alloy at a high temperature for transportation- related industrial applications. AT42-xPd (x = 0, 1 and 2 wt. %) alloys were prepared using a permanent mould casting method. The microstructures of the as-cast alloys were characterized by the presence of the intermetallic phases Mg17Al12, Mg2Sn and Al4Pd. The addition of Pd was found to improve the tensile properties of AT42 at room and at elevated temperatures, and to increase the creep resistance at elevated temperatures. A small amount of Pd could markedly improve the tensile properties of AT42 by means of grain-refinement and the dispersion of secondary phase strengthening. Moreover, the thermally stable phase Al4Pd effectively improves the creep resistance of AT42 due to the strengthened grain boundaries and the suppressed formation of Mg17Al12.
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