研究了0．05％~0．35％Sr 对 AZ31镁合金晶粒细化的作用，并重点用差热分析方法分析微量锶对AZ31镁合金初晶析出反应的影响，通过合金凝固曲线特征值的变化，考察锶对 AZ31镁合金凝固过程的影响，进而探讨锶对AZ31镁合金的晶粒细化机理.研究表明，添加锶后AZ31镁合金晶粒得到明显细化，其主要有以下两个方面的原因，首先，锶的添加一方面增加了合金的过冷度，从而增大了合金形核几率，使晶粒得到细化；另一方面降低了合金的初晶再辉温差，使α-Mg晶粒的长大受到了抑制.
In the present work the influences of 0.05%-0.35wt% strontium (Sr)on the grain refinement of AZ31 magnesium alloys have been investigated.Also the effects of minor Sr on the primary crystal form reaction were measured by differential thermal analysis method,and the effects of Sr on the solidification process of AZ3 1 magnesium alloys were studied by the changing of the eigenvalues in order to explain the grain refinement mech-anisms.The results show that Sr can effetely refine the grains of the AZ3 1 magnesium alloys,and the reasons were maybe as follow:on one hand,the adding for Sr increased the supper-cooling temperature so as to in-creased the nucleation probability,so the grains been refined;on the other hand,Sr can decrease the recales-cence temperature variation of the primary crystal,and then inhibited theα-Mg grain growth.
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