本文对五种钢和四种高温合金的单轴拉伸变形规律进行了研宄.结果表明:在均匀变形阶段,大多数材料的应力应变关系分段地服从幂乘律σ=εn,但硬化指数n并不等于最大均匀真应变εu;在不均匀变形阶段,应力应变关系多服从线性律.本文测定出七种材料在不均匀变形阶段缩颈曲率半径R随(ε-εu)的变化规律,证实了a/R∝(ε-εu),比例系数在0.6-1之间. In this paper, the uniaxial tensile deformation of five kinds of steels and four kinds of superalloys were studied.The results show that the stress-strain relations of most materials follow the law of power law σ = εn in the stage of uniform deformation, The index n does not equal the maximum uniform true strain εu. In the non-uniform deformation stage, the stress-strain relationship obeys the linear law. The variation of the curvature radius R (ε-εu) of the seven materials during the non-uniform deformation phase is determined , Confirmed a / Rα (ε-εu), the ratio coefficient between 0.6-1.