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对预变形多晶Cu,在不同载荷下进行拉压对称的恒应力循环试验,比较了不同预变形对其饱和行为及位错组态的影响。结果表明,低应力幅下循环饱和行为仍与历史相关,疲劳后的位错组态具有“继承”性。计算不同载荷下的软化量并外推出疲劳软化门槛,约为流变应力的0.43—0.45左右,其值与低碳钢的几乎相同。本文还描述了循环过程的三个阶段,并对其机理进行了探讨。
For the pre-deformed polycrystalline Cu, the tension-compression symmetrical constant-stress cyclic test was carried out under different loads, and the influence of different pre-deformation on its saturation behavior and dislocation configuration was compared. The results show that the behavior of cyclic saturation at lower stress amplitude is still related to history, and the dislocation configuration after fatigue is “inherited”. The softening amount under different loads is calculated and the threshold of fatigue softening is extrapolated, which is about 0.43-0.45 of the flow stress, which is almost the same as that of the mild steel. This article also describes the three stages of the cycle process and explores its mechanism.