六、超塑性变形的机理金属超塑性所具有的异乎寻常的延伸特性,非一般的塑性变形机理所能解释。研究者们便提出了很多的假说和理论。早期有“溶解一沉淀”理论、亚稳态理论、尔后又有人提出晶界滑移、晶界移动、晶粒迴转、扩散蠕变、位错运动、再结晶、晶界非晶质流动等理论。还有人提出用几种机构同时起作用来解释。 Sixth, the mechanism of superplastic deformation Metal superplasticity has an extraordinary extension of the characteristics of non-ordinary plastic deformation mechanism can explain. Researchers have put forward many hypotheses and theories. Early “dissolved a precipitate” theory, metastable state theory, and later was proposed grain boundary slip, grain boundary movement, grain rotation, diffusion creep, dislocation movement, recrystallization, grain boundary amorphous flow theory. Others have suggested that several agencies act simultaneously to explain.