Casting Fluidity of Mg-xGd-1Er-0.5Zr Alloy

Wu Dican; Du Wenbo; Ding Ning; Li Shubo; Wang Yunfeng; Zhu Xunming; Wang Zhaohui

doi:10.15980/j.tzzz.2021.08.012

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Casting Fluidity of Mg-xGd-1Er-0.5Zr Alloy
Vol. 41, Issue 8, Pages: 987-991(2021)
Published： 2021 ，
DOI： 10.15980/j.tzzz.2021.08.012

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Wu Dican, Du Wenbo, Ding Ning, et al. Casting Fluidity of Mg-xGd-1Er-0.5Zr Alloy. [J]. Special Casting & Nonferrous Alloys 41(8):987-991(2021)
DOI：

Wu Dican, Du Wenbo, Ding Ning, et al. Casting Fluidity of Mg-xGd-1Er-0.5Zr Alloy. [J]. Special Casting & Nonferrous Alloys 41(8):987-991(2021) DOI： 10.15980/j.tzzz.2021.08.012.

摘要

采用螺旋试样法研究了Mg-xGd-1Er-0.5Zr(x=8、10、12

质量分数/%)合金的铸造流动性能。结合XRD及热分析法

研究了合金凝固过程中的相析出行为

分析了微观组织变化。结果表明

Gd含量的增加会抑制α-Mg的形核析出

使液相线温度降低

合金熔体自由流动时间增加

使凝固温度区间变窄

能有效改善合金的流动性能。此外

Gd含量的增加使Mg-xGd-1Er-0.5Zr合金的晶粒尺寸下降

流动长度增加

这是由于细化晶粒提高了合金流动时液流前端枝晶搭接时的固相率

延迟了枝晶的搭接。

Abstract

The casting fluidity of Mg-xGd-1 Er-0.5 Zr（x=8

in mass fraction） alloy was investigated by spiral specimen method. The phase precipitation and microstructure of the alloy during solidification were analyzed by XRD and thermal analysis. The results show that with the increase in Gd content

the nucleation and segregation of α-Mg can be inhibited

and the liquidus is decreased and the free flow time of the alloy melt is increased

reducing the solidification temperature range and improving the fluidity of the alloy. In addition

the grain size of Mg-xGd-1 Er-0.5 Zr alloy is decreased and the flow length is increased with increasing in the Gd content

which is attributed to grain refinement that improves the solid phase ratio of dendrite lapping at the front of liquid flow and delays the dendrite lapping.