本文对具有单、双滑移取向组元晶体的近垂直晶界钢双晶体进行拉-拉循环变形、得出铜双晶体中晶界及组元晶体的S-N曲线，比较了铜双晶体晶界及组元晶体疲劳寿命的差别，发现在相同的应力幅下晶界的疲劳寿命明显低于组元晶体的疲劳寿命，但两不同取向的组元晶体的疲劳寿命相差不大,通过对表面疲劳裂纹萌生的观察，发现垂直晶界铜双晶体在相同的循环载荷下萌生致命疲劳裂纹并导致疲劳断裂的难易顺序为：双滑移取向晶体→单滑移取向晶体→晶界
Cyclic tension-tension deformation was carried out on a copper bicrystal which consists of a single and a double slip oriented component crystal. The grain boundary of the bicrystal is nearly perpendicular to the stress axis during cyclic deformation. The S-N curves of grain boundary and component crystals were respectively determined. By comparison of fatigue lives between component crystals and grain boundary, it was found that the fatigue lives of grain boundary were lower than those of component crystals, however, the fatigue lives of two component crystals showed no obvious difference under the same cyclic stress. Surface observation by SEM indicated that the probability of initiating fatigue cracks in copper bicrystal increased in the order of double, single slip oriented component crystals and grain boundary under the same cyclic load amplitude.
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