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关于金属材料产生相变超塑性的内在及外在条件,已如前述。作为产生超塑性的相变过程,无论是扩散性的或者是非扩散性但具有可逆性的,都可以在外部低的应力作用下,通过温度循环而使金属的延伸率或变形量受积累而增高到甚至惊人的程度。因此,纯金属的同素异构转变、合金或钢中的珠光体相变,贝氏体相变以及具有可逆性的马氏体相变等都可以通过温度循环产生超塑性。
The internal and external conditions for the phase transition superplasticity of metallic materials have been described above. As a superplasticizing phase change process, either diffusible or non-diffusive but reversible, the elongation or deformation of the metal can be increased and accumulated by the temperature cycling under low external stress Even to an alarming extent. Therefore, allotrophic transformation of pure metals, pearlite transformation in alloy or steel, bainite transformation and reversible martensitic transformation can produce superplasticity through temperature cycling.