利用Mg 20％Ca(质量分数,下同)和Mg-20％ La中间合金分别对Mg-5Sn-2Si合金进行变质处理,研究Ca和La对Mg2 Si相的变质效果,并进行了高温蠕变实验.结果表明:Ca和La对Mg2Si相起到了良好的变质效果,初晶Mg2Si颗粒消失,粗大树枝晶得到有效细化,且有CaMgSi(花瓣状)和La5Si4(棒状)新相生成.经过Ca和La变质后合金的蠕变速率大幅度降低,在250℃和60MPa应力下,Mg-5Sn 2Si 2Ca和Mg-5Sn-2Si 2La的稳态蠕变速率分别减少到未变质时的1/48和1/28.蠕变抗力提高的原因可能与Mg2 Si相细化、新相生成后位错的滑移和晶界的滑动受到阻碍有关.
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