Abstract
The strengthening and strain hardening behaviors of a CoNiCrFeMn high-entropy alloy were investigated by molecular dynamics (MD) simulation. Two gradient structures, i.e., grain size and composition gradient, were introduced into the alloy, and the alloy is characterized by a high strain hardening rate of 13.84 GPa, the maximum one among reported Cantor-like alloys in MD simulation, within a multistage strain hardening behavior. Distinct phase transformations dependent on the variations of both grain size and stacking fault energy were proposed to play crucial roles in determining the strengthening and the unusual strain hardening behaviors, and the corresponding microstructural evolution at increased strain was provided and discussed.
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Acknowledgements
The present work was supported by the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2020JM-41, No. 2020JM-33) and the Natural Science Foundation of Shaanxi Province (No. 2019TD-020).
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YY contributed to conceptualization, methodology, software, writing—original draft, formal analysis, investigation, visualization. SZ contributed to conceptualization, software, methodology. PH involved in methodology, writing—review and feedback, supervision, funding acquisition. FW helped in conceptualization, methodology, writing—review and feedback, supervision, funding acquisition.
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Yang, Y., Zhang, S., Huang, P. et al. Phase transformation-induced strengthening and multistage strain hardening in double-gradient-structured high-entropy alloys. Appl. Phys. A 128, 258 (2022). https://doi.org/10.1007/s00339-022-05382-7
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DOI: https://doi.org/10.1007/s00339-022-05382-7