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http://dx.doi.org/10.7777/jkfs.2017.37.4.101

The Effect of Pd addition on Mechanical Properties at High Temperature of Mg-4Al-2Sn Alloy  

Yim, Si-On (1st Naval Sea Systems Team, Defense Agency for Technology and Quality)
Kang, Byoung-Soo (1st Naval Sea Systems Team, Defense Agency for Technology and Quality)
Cho, Dae-Hyun (Department of Materials Science and Engineering, Pusan National University)
Park, Ik-Min (Department of Materials Science and Engineering, Pusan National University)
Publication Information
Journal of Korea Foundry Society / v.37, no.4, 2017 , pp. 101-107 More about this Journal
Abstract
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 $Mg_{17}Al_{12}$, $Mg_2Sn$ and $Al_4Pd$. 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 $Al_4Pd$ effectively improves the creep resistance of AT42 due to the strengthened grain boundaries and the suppressed formation of $Mg_{17}Al_{12}$.
Keywords
Magnesium alloys; Casting; Creep test; Tensile test; Palladium;
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