CRYSTAL MORPHOLOGIES AND THE PHASES IN THE Mg-6Zn-3Y ALLOY SOLIDIFIED UNDER SUPER-HIGH PRESSURE
CRYSTAL MORPHOLOGIES AND THE PHASES IN THE Mg-6Zn-3Y ALLOY SOLIDIFIED UNDER SUPER-HIGH PRESSURE
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DOI：
10.3724/sp.j.1037.2011.00395
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发表时间：
2011-12
影响因子：
2.3
通讯作者：
林小娉;董允;徐瑞;孙桂芳;焦世辉
中科院分区：
文献类型：
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作者：
林小娉;董允;徐瑞;孙桂芳;焦世辉
采用SEM和EDS研究了Mg-6Zn-3Y合金超高压凝固组织。结果表明，超高压（GPa级）Mg-6Zn-3Y合金的凝固组织明显细化，且随着凝固压力的增加，组织进一步细化。 4 GPa压力下合金中Zn的溶解度达到1.64%，比大气条件下提高了44%。 Y不溶于基体，形成富含Y的新相和分散在基体中的粒状相。晶体形态变化为：粗大枝晶→超细枝晶→胞状晶，晶体生长由枝状生长转变为胞状生长。关键词 Mg-6Zn-3Y合金, 超高压凝固, 枝晶, 胞状晶, 相成分
The solidification microstructure of Mg-6Zn-3Y alloy under super-high pressure was investigated by SEM and EDS. The results show that solidification microstructure of Mg-6Zn-3Y alloy under super-high pressure (GPa level) could be evidently refined and was further refined with the increase of solidification pressure. Solubility of Zn in the alloy reached up to 1.64% under 4 GPa pressure which was increased by 44% than that under the atmosphere condition. Y is insoluble in the matrix, which resulted in a new phase riched in Y and granular phases which were dispersed in the matrix. The morphology of crystal changes follow: bulky branch crystal→superfine branch crystal→cellular crystal, and the growth of crystal changed from branch growth to cellular growth. KEY WORDS Mg-6Zn-3Y alloy, super-high pressure solidification, dendritic crystal, cellular crystal, phase component