Hot Deformation Behavior and Microstructure Evolution of Cu–Ni–Co–Si Alloys
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. The True Stress–True Strain Curve
3.2. Constitutive Model of Flow Stress
3.3. The Construction and Analysis of Hot Deformation Processing Maps
3.4. Microstructure Analysis
4. Conclusions
- (1)
- Deformation temperature and strain rate have significant effects on the flow stress of the Cu-1.7Ni-1.4Co-0.65Si alloy. The flow stress increases with the extension of strain rate and decreases with the increase in deformation temperature. The dynamic recovery, recrystallization and work hardening coexist during the hot compression deformation process. The precipitates of the (Ni,Co)2Si phase are observed and have a strong effect on dislocation movement, which is a response to the increase in strain and stress.
- (2)
- The hot deformation activation energy Q of the Cu-1.7Ni-1.4Co-0.65Si alloy can be calculated as 468.5 kJ/mol, and the high temperature deformation constitutive equation is confirmed as:
- (3)
- The hot processing map of the Cu-1.7Ni-1.4Co-0.65Si alloy is established on the basis of hot deformation behavior and hot working characteristics. With optimal hot deformation conditions of 940 to 970 °C and 0.01 to 10 s−1, the fine equiaxed grain and no holes are found in the matrix.
Author Contributions
Funding
Conflicts of Interest
References
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Liu, F.; Ma, J.; Peng, L.; Huang, G.; Zhang, W.; Xie, H.; Mi, X. Hot Deformation Behavior and Microstructure Evolution of Cu–Ni–Co–Si Alloys. Materials 2020, 13, 2042. https://doi.org/10.3390/ma13092042
Liu F, Ma J, Peng L, Huang G, Zhang W, Xie H, Mi X. Hot Deformation Behavior and Microstructure Evolution of Cu–Ni–Co–Si Alloys. Materials. 2020; 13(9):2042. https://doi.org/10.3390/ma13092042
Chicago/Turabian StyleLiu, Feng, Jimiao Ma, Lijun Peng, Guojie Huang, Wenjing Zhang, Haofeng Xie, and Xujun Mi. 2020. "Hot Deformation Behavior and Microstructure Evolution of Cu–Ni–Co–Si Alloys" Materials 13, no. 9: 2042. https://doi.org/10.3390/ma13092042