Abstract
The mechanical behavior of VCoNi medium-entropy alloys with five different grain sizes at three different temperatures was investigated. The VCoNi alloys with different grain sizes exhibit a traditional strength–ductility trade-off at 77 K, 194 K and 293 K. Both the yield strength and the uniform elongation of the VCoNi alloys with similar grain size increase with decreasing the deformation temperature from 293 to 77 K. Obvious strain hardening rate recovery characterized by an evident up-turn behavior at stage II is observed in VCoNi alloys with the grain size above 11.1 μm. It is found that the extent of the strain hardening rate recovery increases with increasing grain size or decreasing deformation temperature. This may mainly result from the faster increase in the dislocation multiplication rate caused by the decrease in the dislocation mean free path, the decrease in the absorption of dislocations by grain boundaries and the dynamic recovery from the cross-slip with increasing grain size, as well as the suppressed dynamic recovery at cryogenic temperatures. The critical grain sizes for the occurrence of the recovery of strain hardening rate are determined to be around 9.5 μm, 8.3 μm and 3 μm for alloys deformed at 293 K, 194 K and 77 K, respectively. The basic mechanism for the strain hardening behavior of the VCoNi alloys associated with grain size and deformation temperature is analyzed.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC, Grant No. 52071319) and the Fundamental Research Project of Shenyang National Laboratory for Materials Science (No. L2019F23).
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Liu, GD., Luo, XM., Zou, JP. et al. Effects of Grain Size and Cryogenic Temperature on the Strain Hardening Behavior of VCoNi Medium-Entropy Alloys. Acta Metall. Sin. (Engl. Lett.) 36, 973–986 (2023). https://doi.org/10.1007/s40195-023-01520-z
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DOI: https://doi.org/10.1007/s40195-023-01520-z