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Effects of cooling rate and solute content on the grain refinement of Mg–Gd–Y alloys by al

 

论文名称

Effects of cooling rate and solute content on the grain refinement of Mg–Gd–Y alloys by aluminium

发表期刊名称

Metallurgical and Materials Transactions A

简介

The effect of Al additions on grain refinement of Mg-Gd-Y alloys with different solute contents at different cooling rates has been investigated. For all alloys, significant grain refinement was due to the formation of Al2(Gd x Y1- x ) nucleant particles. The number density and size distribution of Al2(Gd x Y1- x ) were affected by both solute content and the cooling rate. Grain sizes ( d gs) of Mg-Gd-Y base alloys and of Mg-Gd-Y-Al alloys were related to solute content (defined by the growth restriction factor, Q), cooling rate (), and area number density ( ρ ns) and size ( d p) of nucleant particles that can be activated. It is found that grain sizes of Mg-Gd-Y base alloys follow the relationship , while grain sizes of Al-refined samples follow the relationship , where a, b, a', and b' were constants. In addition, the grain refinement effect of Al additions was more susceptible to solute content and the cooling rate than that of Zr which is regarded as the most efficient grain refiner for Mg alloys.

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发表时间

2014.07

影响因子

1.73

完成人

Jichun Dai, M.A. Easton, M.X. Zhang, D. Qiu, X.Y. Xiong, Wencai Liu, Guohua Wu*

联系人

吴国华

电话

13671800698

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