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。
The symmetrical push-pull fatigue tests in load control were carriedout for prestrained polycrystalline Cu. The change in mechanical behaviour duringcycling was recorded in detail and the effect of various degree of prestraining onsaturated behaviour and dislocation structure was compared. The results show thatthe cyclic saturation state is still history-dependent at low stress amplitude and thedislocation structure after fatigue has "inheritance". The amount of softening hasbeen calculated at various load amplitudes and a softening threshold to be about0.43 to 0.45 of the flow stress, which is the same as low carbon steel, is obtainedby extrapolating method. Three stages cyclic process and their mechanism have beendescribed.
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