晶粒的取向和变形性质对双晶体循环变形影响的模拟研究

应用晶体细观力学方法，分析了双晶体循环变形过程中组元晶粒取向及其变形性质（Ｂａｕｓｃｈｉｎｇｅｒ效应和循环硬化）的影响，发现双晶体的反向屈服及循环硬化行为为主要由组元晶粒性质支配，晶间内应力的影响是次要的，晶粒取向对宏微观应力应变行为有重要的影响，取向对称性较弱或罗硬差别较大的双晶体晶界影响较大。

SIMULATION OF CYCLIC DEFORMATION OF BICRYSTALS: EFFECTS OF ORIENTATION AND DEFORMATION PROPERTIES OF CONSTITUENT GRAIN

The cyclic deformation of bicrystals was numerically simulated by using a crystalline micromechanical approach, to study the effects of crystallographic orientation and deformation properties of constituent grains. Both the macro and micro stress strain responses were analyzed. It was shown that the whole Bauschinger effect and cyclic hardening behavior of bicrystals is primarily controlled by the corresponding properties of the constituent grains, and that the effects of internal stresses induced by the grain boundary and the interaction between grains are secondary. Also it was shown that the crystallographic orientation of grains has significant influence on the macro and micro mechanical behavior of bicrystals, the smaller the symmetry in the orientation or the greater the difference in the strength between grains is the greater the effects is.