Al2Ca金属间化合物对AZ31镁合金晶粒细化的影响

来源期刊:中国有色金属学报(英文版)2016年第5期

论文作者:姜中涛 蒋斌 章建跃 戴甲洪 杨青山 杨琴 潘复生

文章页码:1284 - 1293

关键词:AZ31镁合金;Al2Ca;晶粒细化;机理

Key words:AZ31 magnesium alloy; Al2Ca; grain refinement; mechanism

摘    要:采用真空熔炼方法制备Al2Ca金属间化合物并将其添加到AZ31镁合金中,研究其添加量对铸态AZ31镁合金晶粒细化的影响,同时讨论其晶粒细化机理。结果表明:添加1.1% Al2Ca(质量分数)可使得铸态AZ31镁合金晶粒尺寸从354 μm细化到198 μm,且经Al2Ca细化后,合金晶粒的热稳定性良好。晶粒细化的机理是溶质效应和Al2Ca的异质形核协同作用。

Abstract: The Al2Ca intermetallic compound was prepared by melting process in a vacuum induction furnace. And the Al2Ca compound was added in as-cast AZ31 alloys for grain refinement. The effect of its additional levels on grain refinement of as-cast AZ31 alloy was investigated and the mechanism of the grain refinement was discussed. The results reveal that the addition of 1.1% Al2Ca (mass fraction) decreases the average grain size of as-cast AZ31 alloy from 354 to 198 μm. And the thermal stability of the grains refined by Al2Ca is superior. The grain refining mechanism is attributed to the combined effects of solute and heterogeneous nucleation from the Al2Ca.

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