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Metals 2016, 6(11), 293; doi:10.3390/met6110293

Effect of Pre-Fatigue on the Monotonic Deformation Behavior of a Coplanar Double-Slip-Oriented Cu Single Crystal

1
Department of Materials Physics and Chemistry, School of Materials Science and Engineering, Northeastern University, No. 3-11, Wenhua Road, Shenyang 110819, China
2
Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, No. 3-11, Wenhua Road, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Received: 4 October 2016 / Revised: 13 November 2016 / Accepted: 17 November 2016 / Published: 22 November 2016
(This article belongs to the Special Issue Fatigue Damage)
View Full-Text   |   Download PDF [2288 KB, uploaded 22 November 2016]   |  

Abstract

The [ 2 ¯ 33 ] coplanar double-slip-oriented Cu single crystals were pre-fatigued up to a saturation stage and then uniaxially tensioned or compressed to fracture. The results show that for the specimen pre-fatigued at a plastic strain amplitude γpl of 9.2 × 104, which is located within the quasi-plateau of the cyclic stress-strain (CSS) curve, its tensile strength and elongation are coincidently improved, showing an obvious strengthening effect by low-cycle fatigue (LCF) training. However, for the crystal specimens pre-fatigued at a γpl lower or higher than the quasi-plateau region, due to a low pre-cyclic hardening or the pre-induction of fatigue damage, no marked strengthening effect by LCF training occurs, and even a weakening effect by LCF damage takes place instead. In contrast, the effect of pre-fatigue deformation on the uniaxial compressive behavior is not so significant, since the compressive deformation is in a stress state more beneficial to the ongoing plastic deformation and it is insensitive to the damage induced by pre-cycling. Based on the observations and comparisons of deformation features and dislocation structures in the uniaxially deformed [ 2 ¯ 33 ] crystal specimens which have been pre-fatigued at different γpl, the micro-mechanisms for the effect of pre-fatigue on the static mechanical behavior are discussed. View Full-Text
Keywords: Cu single crystal; coplanar double slip; pre-fatigue deformation; plastic strain amplitude; tensile behavior; compressive behavior; dislocation structure Cu single crystal; coplanar double slip; pre-fatigue deformation; plastic strain amplitude; tensile behavior; compressive behavior; dislocation structure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, X.-W.; Wang, X.-M.; Yan, Y.; Guo, W.-W.; Qi, C.-J. Effect of Pre-Fatigue on the Monotonic Deformation Behavior of a Coplanar Double-Slip-Oriented Cu Single Crystal. Metals 2016, 6, 293.

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