Grain refinement of Ca addition in a twin-roll-cast Mg-3Al-1Zn alloy

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• 作者：Bin Jiang^a ; ^c ; ^{jiangbinrong@cqu.edu.cn} ; Wenjun Liu^c ; Dong Qiu^b ; Ming-Xing Zhang^b ; Fusheng Pan^a
• 关键词：Alloy ; Microstructure ; Crystallography ; Nucleation
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：16 April, 2012
• 卷：133
• 期：2-3
• 页码：611-616
• 文件大小：975 K

摘要

Addition of 0.08 wt% Ca into AZ31 melts significantly reduces the average grain size of thin strips produced by twin-roll-cast to 30 渭m from 100 渭m. Like Zr, due to the high chemical activity, the Ca added into the melts reacts with Al and forms Al₂Ca intermetallic compound. X-ray diffraction result approves the existence of Al₂Ca in the thin strips, which formed in the melts. Crystallographic examination of relationship between Al₂Ca and Mg using the edge-to-edge matching model indicates that Al₂Ca particles are effective inoculants for heterogeneous nucleation of Mg. It is considered that Al₂Ca is a potential and effective grain refiner for Mg alloys and the grain refinement through addition of Ca in the AZ31 alloy is attributed to the inoculation effect of Al₂Ca particles formed in the melts.