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采用逐级增幅方法研究了［００１］同轴钢三晶体及一种非同轴取向平行三晶交线铜三晶体的循环形变行为，并观察了三晶交点和晶界附近的位错组态为了对比，也研究了两种取向三晶体的组元晶粒双晶体和单晶体试样的循环形变行为对于［００１］同轴取向平行三晶交线三晶体及其组元双晶体和单晶体，其循环硬化曲线几乎重合，其循环饱和应力应变曲线（ＣＳＳＣ）也相差不大，由于各滑移系之间的位错反应生成Ｌｏｍｅｒ－Ｃｏｔｔｒｅｌ锁，阻碍位错运动，所以三晶交线和晶界对轴向饱和应力几乎没有强化作用，对于［００１］取向晶体，在（００１）观察面上，可以看到很多较短的一段一段的位错墙结构，各段之间互不连通，这是各滑移系之间的位错反应强烈，生成不动的位错锁的结果，这也是三晶交线和晶界无明显强化作用的原因，对于非同轴取向钢三晶体及组元晶粒双晶体、单晶体的循环形变行为研究表明，只要是相同取向的晶粒，不论是单晶体、双晶体还是三晶体，位错组态基本相同，相同的位错组态对应相同的轴向应力，双晶体和三晶体的轴向饱和应力主要由各晶粒所占的体积分数决定，稍高于各晶粒轴向饱和应力按体积分数的加权平均对于非同轴三晶体和双晶体，在相同的应变幅下，相同的观察面和相同的晶界附近，滑?
The cyclic deformation behavior of [001] coaxial steel and a non-coaxial parallel triple-crystal copper-clad triplex was studied by step-by-step amplification method. The dislocation configurations near the triple junction and the grain boundary For the sake of comparison, the cyclic deformation behavior of two-oriented three-crystal component grain twinned and single-crystal samples was also studied. For [001] co-axial oriented parallel triclinic triplets and their component bimodal and single crystals, Cyclic hardening curve almost coincide, and its cyclic saturation stress-strain curve (CSSC) is not much difference, due to the dislocation reaction between the slip system to generate Lomer-Cottrel lock, impeding the dislocation movement, so the tri-crystal line and the grain boundary There is almost no strengthening effect on the axial saturated stress. For the [001] oriented crystal, many shorter sections of dislocation wall structures can be seen on the (001) observation plane, and the sections are disconnected from each other, which is The dislocation reaction between the slip systems is strong, resulting in a fixed dislocation lock result, which is also the reason for the three-crystal line of intersection and grain boundaries without significant strengthening effect, The study on the cyclic deformation of single-crystal and non-co-axially oriented three-crystal steel and component single crystal shows that the dislocation configurations are basically the same and the same, as long as they are of the same orientation, no matter single crystal, double crystal or triple crystal Of the dislocation configuration corresponds to the same axial stress. The axial saturation stress of the twin and the three-phase crystal is mainly determined by the volume fraction of each crystal grain, slightly higher than the weighted average of the axial saturation stress of each crystal grain by the volume fraction For non-coaxial three-crystal and two-crystal, in the same strain amplitude, the same observation surface and the same grain boundary near the slide?