Cryogenic mechanical behaviors of CrMnFeCoNi high-entropy alloy

Fu, Wujing; Zheng, Wei; Huang, Yongjiang; Guo, Fangmin; Jiang, Songshan; Xue, Peng; Ren, Yang; Fan, Hongbo; Ning, Zhiliang; Sun, Jianfei

doi:10.1016/j.msea.2020.139579

Cryogenic mechanical behaviors of CrMnFeCoNi high-entropy alloy

Journal Article · Fri May 29 00:00:00 EDT 2020 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2020.139579· OSTI ID:1774493

Fu, Wujing ^[1]; Zheng, Wei ^[2]; Huang, Yongjiang ^[1]; Guo, Fangmin ^[3]; Jiang, Songshan ^[1]; Xue, Peng ^[1]; Ren, Yang ^[4]; Fan, Hongbo ^[1]; Ning, Zhiliang ^[1]; Sun, Jianfei ^[1]

Harbin Inst. of Technology (China)
Xi'an Space Engine Company Limited (China)
China Univ. of Petroleum, Beijing, (China)
Argonne National Lab. (ANL), Argonne, IL (United States)

The CrMnFeCoNi high-entropy alloy (HEA) exhibits higher yield strength, ultimate strength and ductility at lower temperature. To further clarify the effect of the testing temperature on microstructure evolution, in this study in-situ synchrotron-based high-energy X-ray diffraction tensile tests were carried out from 298 K down to 123 K. The enhanced yield strength of the alloy at cryogenic temperatures can be attributed to the greater lattice distortion prior to plastic deformation. Higher strain hardening rate leads to the simultaneously enhanced strength and ductility of the studied HEA below room temperature. Both dynamic Hall-Petch hardening (twinning) and dislocation hardening provide high work hardening capacity for this alloy during the plastic deformation at cryogenic temperatures. The increased dislocation density and nano-twins at cryogenic temperatures can be attributed to the decrease in the stacking fault energy as the deformation temperature decreases. These studies could provide an in-depth understanding for the strengthening mechanisms of the HEA in different temperature conditions and guide the exploration of HEAs with superb mechanical properties at cryogenic environments.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1774493

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Vol. 789; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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