摘要
本文用电镜等对室温下超塑性变形中的Ｚｎ－２２％Ａｌ共析合金的组织变化进行了观察，发现在该合金中α相（富Ａｌ相）＋β相（富Ｚｎ相）两相组织中，在三叉晶界存在亚微观破坏区和显微孔洞，在α、β晶界的某些区域存在条纹带，某些晶粒内部存在大量位错及其缠结。据此得出超塑性变形的主要机制是晶界滑动、孔洞和位错运动松弛晶界引起应力集中，协调了晶界滑动的连续进行。条纹带是晶界迁移的结果。
in this paper, the structure change of a superplastic Zn-220%Al eutectoid alloy was investigated and discussed in the room temperature in terms of optical and electron microscope. It's shown that microregions and microholes in the triple points of grain boundary are existed. The striped bands are existed in some grain boundary and many dislocations are existed in some grain. It's obtained that main mechanism of superplastics is grain boundary sliding.The hole and movement of dislocations relax the stress concentration because of grain boundary sliding. The striped band is the result of grain boundary sliding.
出处
《材料科学与工程》
CSCD
1995年第4期22-24,共3页
Materials Science and Engineering
关键词
超塑性
晶界滑动
锌合金
铝合金
室温
变形
superplastic, grain boundary sliding, hole, striped band, dislocation
