Abstract
By investigating a metastable high-entropy alloy, we report a latent strengthening mechanism that is associated with the thermally-induced epsilon-martensite-to-austenite reverse transformation. We show this reversion-assisted hardening effect can be achieved in the same time-scale and temperature range as conventional bake-hardening treatment, but leads to both improved strength and cumulative ductility. Key mechanisms are discussed considering transformation kinetics, kinematics, strengthening and ductilization modules.
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The authors thank Ms. Geetha Berera for extensive support on the DSC measurement. Dr. Hyunseok Oh and Ms. Yuntong Zhu are also acknowledged for fruitful discussion and important inputs. Shaolou Wei would like to express his gratitude to Prof. Ju Li (Massachusetts Institute of Technology, USA) for valuable suggestions on deformation energy landscape.
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Manuscript submitted April 26, 2019.
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Wei, S., Jiang, M. & Tasan, C.C. Interstitial-Free Bake Hardening Realized by Epsilon Martensite Reverse Transformation. Metall Mater Trans A 50, 3985–3991 (2019). https://doi.org/10.1007/s11661-019-05344-4
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DOI: https://doi.org/10.1007/s11661-019-05344-4