Damage evolution law study by micro - parameter of dislocation cell and positron annihilation life 用位错胞及正电子湮没寿命为参量的损伤演变律
The refinement mechanism of grain at room temperature can be described as dislocation tangle and dislocation node form in the initial grain with severe plastic deformation , then the dislocation node form subgrains or grains . subgrains become grains by snipping of the subgrain boundaries under the action of shearing stress 室温ecap细化晶粒的机理可描述为:随着强烈塑性变形的进行,原始晶粒中产生了很多位错缠结和位错胞,进而位错胞崩塌变为亚晶或晶粒,亚晶粒在后续ecap剪应力作用下,通过亚晶界被剪断而变为晶粒。