Effect of Pre-Fatigue on the Monotonic Deformation Behavior of a Coplanar Double-Slip-Oriented Cu Single Crystal
Department of Materials Physics and Chemistry, School of Materials Science and Engineering, Northeastern University, No. 3-11, Wenhua Road, Shenyang 110819, China
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
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 × 10−4
, 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
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.
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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.
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(11):293.
Li, Xiao-Wu; Wang, Xiao-Meng; Yan, Ying; Guo, Wei-Wei; Qi, Cheng-Jun. 2016. "Effect of Pre-Fatigue on the Monotonic Deformation Behavior of a Coplanar Double-Slip-Oriented Cu Single Crystal." Metals 6, no. 11: 293.
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