Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructures
3.2. Flow Stress Behavior
3.3. Constitutive Modeling
3.4. Generation of Processing Maps
4. Conclusions
- (1)
- The flow behavior of Al0.5CoCrFeNi HEA is sensitive to deformation temperature and strain rate. The flow stress increases with the increase in strain rate and the decrease in deformation temperature. Moreover, the homogenized alloy shows a higher flow stress compared with the as-cast alloy under the same deformation condition.
- (2)
- The average activation energy of the as-cast and homogenized Al0.5CoCrFeNi alloys is calculated to be 293.83 and 300.99 kJ/mol, respectively. The constitutive equation that describes the flow stress of the homogenized Al0.5CoCrFeNi alloy as a function of strain rate and deformation temperature at a true strain of 0.8 was determined to be
- (3)
- Processing maps show that the homogenized alloy has a better hot workability than as-cast alloy because the optimum thermo-mechanical processing parameters are relatively easier to determine. The optimum processing parameters of the homogenized Al0.5CoCrFeNi HEA are T = 945–965 °C and strain rate = 10−1.7–10−1.1 s−1.
Supplementary Materials
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Elements | Al | Co | Cr | Fe | Ni | |
---|---|---|---|---|---|---|
Nominal | 11.12 | 22.22 | 22.22 | 22.22 | 22.22 | |
As-cast | DR(A) | 12.35 | 22.38 | 23.03 | 22.48 | 19.76 |
ID(B) | 22.24 | 17.52 | 18.02 | 18.01 | 24.21 | |
Homogenized | DR(C) | 8.95 | 21.74 | 25.77 | 24.62 | 18.92 |
ID(D) | 14.50 | 22.97 | 19.81 | 22.08 | 20.64 | |
P(E) | 18.89 | 20.07 | 16.81 | 19.23 | 25.00 |
Temperature (°C) | 900 | 1000 | ||||||
---|---|---|---|---|---|---|---|---|
(s−1) | 10−3 | 10−2 | 10−1 | 1 | 10−3 | 10−2 | 10−1 | 1 |
As-cast (MPa) | 94 | 152 | 247 | 397 | 55 | 95 | 146 | 246 |
Homogenized (MPa) | 115 | 168 | 254 | 404 | 63 | 102 | 175 | 263 |
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Zhang, Y.; Li, J.; Wang, J.; Niu, S.; Kou, H. Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys. Metals 2016, 6, 277. https://doi.org/10.3390/met6110277
Zhang Y, Li J, Wang J, Niu S, Kou H. Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys. Metals. 2016; 6(11):277. https://doi.org/10.3390/met6110277
Chicago/Turabian StyleZhang, Yu, Jinshan Li, Jun Wang, Sizhe Niu, and Hongchao Kou. 2016. "Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys" Metals 6, no. 11: 277. https://doi.org/10.3390/met6110277