利用SEM、EDS、XRD研究了超高压凝固下Mg-6Zn-Y合金的凝固组织及性能.结果表明,常压下Mg-6Zn-1Y合金的宏观凝固组织为粗大的树枝晶,二次枝晶间距约为40～ 50 μm;在GPa级超高压凝固条件下,合金的凝固组织显著细化,6 GPa-1300℃凝固条件下,其二次枝晶间距仅为3～6μm;超高压下凝固的合金基体上分布的粒状相更加细小和均匀弥散,单位面积上粒状相的数量显著增多.常压下合金的显微硬度为59 HV,在6 GPa下超高压下合金的硬度大幅提高,达到85 HV.高压下合金的弹性模量由常压下的68 GPa减小到6 GPa下的59 GPa.
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