摘要
本文借助于透射电镜和扫描电镜，观察了Ｚｎ－２２％Ａｌ合金超塑变形时，脉冲电流对其组织和断裂行为的影响。研究表明，施加脉冲电流，合金中各部分晶粒变形是不均匀的，局部发生动态回复和动态再结晶，同时保留着纤维状或放射状的变形组织。合金的断裂是通过晶界开裂、扩展、最终断裂，表现出沿晶断裂机制。
By the aid of transmission electrical lense and scanning lense, the influence of impulse current on the structure and failure behvior of Zn-22% Al alloy is surveyed while the alloy is under superplastic deformation, The study indicates that deformation of crystals in various parts of alloy is not uniform us impulse current is applied; dynamic restoration and dynamic recrystallization take place localy, as the fibric form and radiating form of deformation structure are remained simultaneously. The alloy is foiled by this way: micro-fractures rise firstly on the boundary of crystals, propagate then and fail at last. It seems that the mechanism of the failure is intergranulur.
出处
《上海有色金属》
CAS
1996年第3期103-106,共4页
Shanghai Nonferrous Metals
基金
国家自然科学基金
湖北省自然科学基金
关键词
脉冲电流
断裂
锌铝合金
组织
Zn-22% Al alloy
Impulse current
Dynamic restoration
Dynamic recrystallizaton failure
