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试验熔制了Mg-12%Li-1%Al合金,研究了添加少量的CaF2对合金组织和性能的影响。通过显微观察可知,被还原元素Ca对显微组织中的β相(bcc)有细化作用,Ca主要富集在晶界处,合金中的晶界网格为Ca和Al的富集物,为Al2Ca化合物。显微组织细化机理可以认为,由于Ca在晶界处的吸附作用极大的抑制了晶粒的长大而使其细化。室温下进行轧制板材拉伸测试,结果表明,置换出来的元素Ca可以提高合金的强度和塑性。
The experiment melted Mg-12% Li-1% Al alloy, and studied the effect of adding a small amount of CaF2 on the microstructure and properties of the alloy. The microscopic observation shows that the reduced element Ca has the effect of refining the β phase (bcc) in the microstructure. Ca is mainly enriched in the grain boundary. The grain boundary grid in the alloy is a mixture of Ca and Al , Al2Ca compounds. The microstructure refinement mechanism can be considered, due to the adsorption of Ca in the grain boundary greatly inhibited the growth of grain refinement. Tensile test of the rolled sheet at room temperature showed that the Ca element can improve the strength and ductility of the alloy.