稀土对Zn-Al共晶合金超塑性的影响

Effect of rare earth on superplasticity of Zn-Al eutectic alloy

采用恒速度法测量了稀土Zn 5Al共晶合金的塑性拉伸曲线 ,结合金相组织研究了稀土对其超塑性特性的影响。结果表明 :在Zn 5Al合金中添加 0 .0 5 %～ 0 .2 % (质量分数 ,下同 )的稀土Ce ,可提高合金超塑变形的延伸率 ,在 35 0℃以上进行超塑拉伸时 ,稀土抑制Zn向Al中的扩散和溶解 ,阻碍扩散溶解层达到饱和 ,有利于α/ β相界的滑移 ,从而增强了Zn 5Al合金的超塑性效应。

The superplastic deformation curves of Zn 5Al eutectic alloy containing small amounts of rare earths were measured, and the influence of rare earth on the superplasticity was discussed. The results show that the elongation of Zn 5Al eutectic alloy can be increased if less than 0.2% Ce were added, and the rare earth can refrain the diffusion and dissolution of Zn to Al and postpone the saturation of the diffusion solution zone above 350?℃, and in such a way boost up α/β interface sliding and benefit the superplasticity.