Effect of Al₂Ca intermetallic compound addition on grain refinement of AZ31 magnesium alloy

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• 作者：Zhong-tao JIANG^a ; ^b ; Bin JIANG^a ; ^c ; ^{jiangbinrong@cqu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jian-yue ZHANG^a ; Jia-hong DAI^a ; Qing-shan YANG^c ; Qin YANG^d ; Fu-sheng PAN^a ; ^c
• 关键词：AZ31 magnesium alloy ; Al2Ca ; grain refinement ; mechanism
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：26
• 期：5
• 页码：1284-1293
• 全文大小：4841 K

文摘

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.