Impact of Short-Range Clustering on the Multistage Work-Hardening Behavior in Cu–Ni Alloys
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Compressive Mechanical Property
3.2. Unexpected Multistage Work-Hardening Behavior of Cu–Ni Alloys
3.3. Microstructural Evolution
4. Conclusions
- (1)
- An unexpected multistage (including Stages A, B, and C) work-hardening process was found in high-SFE Cu–Ni alloys. With the increase of Ni content (or SRC content), the flow stress of Cu–Ni alloys is significantly increased, which is mainly attributed to the improvement of work-hardening capacity.
- (2)
- The work-hardening behavior of Stage B strongly depends on the SRC content in Cu–Ni alloys. With increasing SRC content, a gradual transition of dislocation structures occurs from loose tangles to planar-slip structures, which effectively suppress dislocation cross slip and increase the density of movable dislocations during deformation. Consequently, a noticeable recovery of work-hardening rate was found in Stage B in the Cu–20at.% Ni alloy.
- (3)
- With increase of strain to Stage C, a second decrease of work-hardening rate was observed for all Cu–Ni alloys, ascribing to the prevalence of dislocation cross slip due to the overall destruction of SRC by moving dislocations. The oriented cell walls structures formed in the Cu–20at.% Ni alloy can, more or less, relieve the rate of dynamic recovery of dislocations, so that it still exhibits a higher work-hardening rate in this stage.
Author Contributions
Funding
Conflicts of Interest
References
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Han, D.; He, J.-X.; Guan, X.-J.; Zhang, Y.-J.; Li, X.-W. Impact of Short-Range Clustering on the Multistage Work-Hardening Behavior in Cu–Ni Alloys. Metals 2019, 9, 151. https://doi.org/10.3390/met9020151
Han D, He J-X, Guan X-J, Zhang Y-J, Li X-W. Impact of Short-Range Clustering on the Multistage Work-Hardening Behavior in Cu–Ni Alloys. Metals. 2019; 9(2):151. https://doi.org/10.3390/met9020151
Chicago/Turabian StyleHan, Dong, Jin-Xian He, Xian-Jun Guan, Yan-Jie Zhang, and Xiao-Wu Li. 2019. "Impact of Short-Range Clustering on the Multistage Work-Hardening Behavior in Cu–Ni Alloys" Metals 9, no. 2: 151. https://doi.org/10.3390/met9020151