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材料工程  2009 

快速凝固Mg-Zn-Y-Zr合金条带的组织和性能研究

Keywords: 快速凝固,Mg-Zn-Y-Zr合金,冷却速度,显微组织

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Abstract:

采用普通凝固和快速凝固技术制备Mg-5Zn-1Y-0.6Zr合金,用XRD,SEM,显微硬度测量等分析方法研究其凝固组织和性能特征。结果表明,普通凝固合金由α-Mg固溶体和在晶界处呈不连续网状分布的三元相I-(Mg3Zn6Y)准晶相和W-(Mg3Zn3Y2)相组成。快速凝固合金晶粒细化并产生非晶相,晶间化合物全部转化为准晶I相。非晶相的出现及显微组织细化是造成快速凝固合金条带显微硬度提高的主要原因。快速凝固合金条带的显微硬度随冷速提高显著增大,最大值HV167.23是普通凝固合金的2.2倍。

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