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本文叙述了在Zn-Al共析合金内加入微量Cu及Mg等添加元素所引起的室温强度及高温超塑性的变化,获得了所需要的、既有一定室温性能、又保持一定高温超塑性的材料。研究了合金的应变速度对真实应力关系的“S”型曲线,测定了m值,试验及观察了应变速度、应变温度对最大延伸率之关系,及晶粒度变化等问题。对几种不同的处理方法试验了所得的超塑性能。研究了不同变形量对晶粒组织变化的关系,对合金在超塑变形中出现的晶粒粗化现象,室温时之工作软化现象,应变速度敏感性等问题,进行了初步的探讨。
This article describes the room temperature strength and high temperature superplasticity caused by the addition of trace elements such as Cu and Mg in the Zn-Al eutectoid alloy, and obtains the required, both certain room temperature properties, but also maintain a certain high temperature superplasticity material. The “S” curve of the relationship between the strain rate and the true stress of the alloy was studied. The value of m was measured. The relationship between the strain rate and strain rate, the maximum elongation and the variation of grain size were tested and observed. The resulting superplastic properties were tested for several different treatments. The relationship between different deformations and the microstructure of the alloy was studied. The problems of the coarsening of the grains during the superplastic deformation, the work softening at room temperature and the sensitivity to strain rate were discussed.