Grain refinement of AZ31 magnesium alloy sheet produced by melt drag process with super heat treatment

Abstract

Magnesium alloy is the lightest structural material, so the market such as electrical device is increasing. The purpose of this study is to reveal the effect of superheat treatment for crystal grain size in melt drag process. Melt drag process is one of single roll strip casting process, and strip is made by molten metal directly. Superheat treatment temperature of molten metal are 750~1000, and superheat treatment time are 0~30 min. After superheat treatment, strip was casted by melt drag process. Crystal grain size, strip thickness and Vickers hardness were examined. Minimum crystal grain size is about 12 μm.