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

Abstract

Abstract:The [233] 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 γ pl 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 γ pl 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 [233] crystal specimens which have been pre-fatigued at different γ pl , the micro-mechanisms for the effect of pre-fatigue on the static mechanical behavior are discussed.

Impact of Short-Range Clustering on the Multistage Work-Hardening Behavior in Cu–Ni Alloys

“…Metals 2019, 9 FOR PEER REVIEW 7 almost analogous to those in pure Cu [38]. As the Ni content is increased to 10 at.%, extended dislocation cells can be frequently observed (Figure 5b).…”

“…However, a significant difference in dislocation configuration among these three Cu-Ni alloys can be observed. For the Cu-5at.% Ni alloy, the dislocation cells are the most common microstructures (Figure 5a), which are almost analogous to those in pure Cu [38]. As the Ni content is increased to 10 at.%, extended dislocation cells can be frequently observed (Figure 5b).…”