上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY Usage of phase diagrams 2 To purify a material in M 液相 certain region 固溶体 The impurities in the solid is less than in liquids 20B 熔 熔 图5-15区域熔炼示意图 9Usage of phase diagrams 2 To purify a material in certain region The impurities in the solid is less than in liquids 9