EFFECT OF Ce ADDITIONS ON HIGH TEMPERATURE PROPERTIES OF Mg-5Sn-3Al-1Zn ALLOY

摘要

This study examined the microstructure and high temperature tensile properties of Mg-5Sn-3Al-1Zn-xCe (x=0, 0.5 and 1.0 wt.%) alloys. The alloys were melted in a steel crucible under a CO_2+SF_6 atmosphere and poured into a preheated permanent mold at 200. The microstructure of the Mg5Sn-3A1-1Zn alloy consisted mainly of a-Mg, Mg_(17)Al_(12) and Mg_2Sn phases. With increasing Ce content, an Al_(11)Ce_3 phase was newly formed on the grain boundaries. The results showed the tensile strength at room temperature decreased with increasing Ce content but increased at elevated temperatures.