F.R. Cao and J.Z. Cui(Department of Metalforming
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P.O.B 317
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Northeastern University
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Shenyang 110006
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China)
金属学报(英文版)
The maximum elongation-to-failure of 960% has been achieved in the Mg-8wt%Li alloy. It is shown by measurement of true stress-strain curve and microstructure observation that dynamic recrystallization takes place during superplastic deformation, which turns the banded grains into equiaxed grains. It is postulated by theoretical analysis that during superplastic deformation,continuous introduction of lattice dislocations into the phase interfaces contributes to the superplasticity in this alloy.During superplastic deformation,grain growth and cavity nucleation at α phase grain boundaries have also been observed.
关键词:
superplasticity
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崔崇亮
,
朱天龙
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孙俭峰
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巫瑞智
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张密林
稀有金属材料与工程
研究了挤压态Mg-5 Li-3Al-2Zn-XNd(X=0,0.4,2.0,质量分数,％)合金的显微组织及其织构演变情况.结果表明,Nd的加入有利于合金在变形过程中启动非基面滑移.当Nd添加量为2.0％时,(0002)极图中显示出了Mg合金中罕见的非基面织构类型(ND向TD右侧偏转约30°).非基面滑移系的出现一方面与加入Nd后合金的c/a值进一步减小有关,又与大量弥散分布在合金中的Al-RE相对基面织构的弱化有关.另外,由于稀土元素的加入对Mg合金的层错能的改变也有一定作用.
关键词:
稀土
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镁锂合金
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挤压
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极图
