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金属学报 2015

Mg-Zn-Gd三元铸造镁合金的自由凝固路径选择*

DOI: 10.11900/0412.1961.2014.00512, PP. 580-586

刘少军,杨光昱,介万奇

Keywords: Mg-Zn-Gd三元镁合金,凝固路径,冷却速率,计算模型

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Abstract:

采用实验和数值计算方法,研究了Mg-4.58Zn-2.6Gd三元铸造镁合金的自由凝固路径选择.实验结果表明,当铸型冷却速率≤0.75K/s时,合金首先生成的共晶为α(Mg)+W(Mg3Zn3Gd2);当铸型冷却速率≥7.71K/s时,合金首先生成的共晶为α(Mg)+I(Mg3Zn6Gd).建立了综合考虑合金液相扩散和冷却速率因素的多元合金初生相凝固路径计算模型.耦合热力学计算软件Thermo-Calc及其数据库获得了Mg-4.58Zn-2.6Gd合金凝固路径计算所需的热力学数据,发现计算结果与实验结果吻合良好.

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