Fatigue Property of Ultrafine-grained Copper Produced by ECAP

Acta Metall Sin

2007, Vol. 43

Issue (5): 498-502 DOI:

Research Articles

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Fatigue Property of Ultrafine-grained Copper Produced by ECAP

西安交通大学；西安建筑科技大学4#

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. Fatigue Property of Ultrafine-grained Copper Produced by ECAP. Acta Metall Sin, 2007, 43(5): 498-502 .

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Abstract The fatigue life and cyclic deformation behavior of UFG copper produced by ECAP is studied in this paper. The changes of the grain size and the development of slip bands are observed by means of electron back scattering diffraction and TEM, respectively. The result shows that the fatigue limit of the UFG copper corresponding to 107 cycles is 153MPa. Cyclic softening occurs in the low-cycle fatigue region whereas stable cyclic behavior or even cyclic hardening occurs in the high-cycle region. Persistent slip bands (PSB)-like shear bands (SBs) were approximately parallel to the shearing plane of last pressing. The formation of SBs is the main factor causing crack nucleation as well as premature failure.

Key words: equal channel angular pressing ultrafine-grained copper fatigue limit shear bands

Received: 01 August 2006

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2007/V43/I5/498

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