FATIGUE SOFTENING BEHAVIOUR AND ITS THRESHOLD OF COLD STRAINED POLYCRYSTALLINE Cu

Acta Metall Sin

1990, Vol. 26

Issue (5): 56-61 DOI:

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FATIGUE SOFTENING BEHAVIOUR AND ITS THRESHOLD OF COLD STRAINED POLYCRYSTALLINE Cu

FAN Quncheng;CHAI Huifen;TONG Mingxin Xi'an Jiaotong University

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FAN Quncheng;CHAI Huifen;TONG Mingxin Xi'an Jiaotong University. FATIGUE SOFTENING BEHAVIOUR AND ITS THRESHOLD OF COLD STRAINED POLYCRYSTALLINE Cu. Acta Metall Sin, 1990, 26(5): 56-61.

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Abstract 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.

Key words: polycrystalline Cu fatigue softening dislocation

Received: 18 May 1990

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1990/V26/I5/56

1 Feltner C E, Laird C. Acta Metall, 1967; 15: 1621
2 Chai Huifen (柴惠芬), Laird C. Mater Sci Eng, 1987; 93: 159
3 Winter A T, Pedersen O B, Rasmussen K V. Acta Metall, 1981; 29: 735
4 Rasmussen KV, Pedersen OB. Acta Metall, 1980; 28:1467
5 Feltner C E, Laird C. Acta Metall, 1967; 15: 1633

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