期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.140398
关键词
High-entropy alloy; Prestrain; Deformation twins; Cryogenic strengthening; Yield strength
类别
资金
- Fundamental Research Funds for the Central Universities [N180204015]
- fund of the State Key Laboratory of Solidification Processing in NPU [SKLSP201922]
- LiaoNing Revitalization Talents Program [XLYC1808027]
- Chinese Academy of Sciences (CAS)
- Japan Society for the Promotion of Science (JSPS) through the Bilateral Program [GJHZ1774]
Prestraining at 77 K was found to significantly enhance the yield strength, elongation, and strain-hardening capability of the CoCrFeMnNi HEA, mainly due to the formation of deformation twins. This study demonstrates that cryogenic prestraining can be an effective strategy to improve the mechanical properties of FCC HEAs, enhancing their potential applications in cryogenic environments.
The yield strength of face-centered cubic (FCC) alloy is always insufficient for applications. In this work, different prestrain histories were imposed to improve the yield strength and strain-hardening capability of an ultrafinegrained (UFG) CoCrFeMnNi high-entropy alloy (HEA). In contrast to the specimens prestrained at 293 K, the specimens prestrained at 77 K possess higher yield strength, elongation, and strain-hardening capability, which were intensely related to the formation of deformation twins. The cryogenic strengthening magnitude is found to be strongly associated with the grain size, but slightly affected by dislocations. By modulating the prestrain history, an ultrahigh yield strength of 1.84 GPa and a considerable uniform elongation of 13% were achieved at 77 K in the CoCrFeMnNi HEA. Hence, imposing prestrain on HEAs at 77 K could be an efficient strategy to harmonize the mechanical properties of the FCC HEAs, which would enrich the application of HEAs in cryogenic fields.
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