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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (26권1호 34-39)

Study on Castability and Creep Properties of Mg-Zn-Y-X (X=A1 or Mm) Alloys as Casting Alloy

주조용 합금으로서 Mg-Zn-Y X (X=A1 or Mm) 합금의 주조성 및 크리프 성질에 관한 연구

Hyun-Kyu L im, Ju-Youn Lee, Won-Tae K im *, Do-Hyang Kim

Yonsei University, Cheongju University

Abstract

In the present study, the possibility of Mg-Zn-Y alloys as high temperature casting alloys has been investigated. The fluidity of alloys containing yttrium were better than that of commercial AZ91 alloy because the oxide layer on the surface reduced the reaction between melt, and air and mold, which would reduce the resistance during the process of filling the mold. However, this oxide film reduced the hot-tearing resistance. In the case of ZAW942, this alloy exhibited fluidity and hot- tearing resistance better than AZ91 alloy. Because of thermally stable quasicrystal and other phases obstructed the movement of grains, the creep resistance of alloys containing rare earth elements more than 2 wt% was better than that of AZ91 alloy.

Keywords

Mg-Zn-Y alloys, Icosahedral quasicrystalline phase, Cast magnesium alloys, Castability, Creep test.