The elastic range, the plastic range (during which the material flows at a constant stress), the strain-hardening range, and the range during which necking occurs, terminating in fracture.
弹性范围，塑料范围（当材料以不变的应力流动时），应变硬化范围和发生颈缩现象以其断裂终止的范围。
2
Fracture surface consists of plastic yield deformation area and elastic deformation area.
断口主要分为塑性屈服变形区和弹性变形区两部分。
3
We found: the samples experience elastic and plastic deformation processes before fracture, and the elastic strain is very large, it is about 2%.