前言超塑性是金属材料在特定条件下,只需很小的变形应力作用(比一般金属塑性变形的作用应力小十倍至几十倍),便能产生类似塑料、玻璃那样一种整体性的均匀变形,而呈现出异常高的延伸现象(延伸率达100～2000%)。一般用应变速度敏感指数m 值(σ=k(?),σ式中一变形应力,K—材料常数,(?)—应变速度)的大小来反映获得大变量的能力。并把m值>0.3定义为超塑性. Preface Superplasticity is the metal material under certain conditions, only a small deformation stress (less than the general metal plastic deformation of the role of stress ten to several times), can produce similar to plastic, glass, a holistic Uniform deformation, showing a very high extension of the phenomenon (elongation of 100 ~ 2000%). Generally, the ability to obtain large variables is reflected in the magnitude of the strain rate sensitivity index m (σ = k (?), Σ in a deformation stress, K-material constant, (?) - strain rate) And m value> 0.3 is defined as superplasticity.