CRYSTAL MORPHOLOGIES AND THE PHASES IN THE Mg–6Zn–3Y ALLOY SOLIDIFIED UNDER SUPER–HIGH PRESSURE

doi:10.3724/SP.J.1037.2011.00395

Acta Metall Sin

2011, Vol. 47

Issue (12): 1550-1554 DOI: 10.3724/SP.J.1037.2011.00395

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CRYSTAL MORPHOLOGIES AND THE PHASES IN THE Mg–6Zn–3Y ALLOY SOLIDIFIED UNDER SUPER–HIGH PRESSURE

LIN Xiaoping ¹, DONG Yun ¹, XU Rui ², SUN Guifang ¹, JIAO Shihui ¹

1. Department of Materials Science and Engineering, Northeastern University, Shenyang 110819
2. School of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004

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LIN Xiaoping DONG Yun XU Rui SUN Guifang JIAO Shihui. CRYSTAL MORPHOLOGIES AND THE PHASES IN THE Mg–6Zn–3Y ALLOY SOLIDIFIED UNDER SUPER–HIGH PRESSURE. Acta Metall Sin, 2011, 47(12): 1550-1554.

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Abstract 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 this way: 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

Received: 27 June 2011

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Supported by Natural Science Foundation of Hebei Province (No.E2010001398) and Natural Science Foundation of Liaoning Province (No.20112063)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00395 OR https://www.ams.org.cn/EN/Y2011/V47/I12/1550

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