Adiabatic shear localization in the CrMnFeCoNi high-entropy alloy

Li, Zezhou; Zhao, Shiteng; Alotaibi, Senhat M.; Liu, Yong; Wang, Bingfeng; Meyers, Marc A.

doi:10.1016/j.actamat.2018.03.040

Adiabatic shear localization in the CrMnFeCoNi high-entropy alloy

Journal Article · Mon Apr 02 00:00:00 EDT 2018 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2018.03.040· OSTI ID:1537905

Li, Zezhou ^[1]; ^[2]; Alotaibi, Senhat M. ^[2]; Liu, Yong ^[3]; Wang, Bingfeng ^[3]; ^[2]

University of California, San Diego, La Jolla, CA (United States); DOE/OSTI
University of California, San Diego, La Jolla, CA (United States)
Central South University, Changsha (China)

The mechanical behavior of the single phase (fcc) CrMnFeCoNi high-entropy alloy (HEA) is examined in the dynamic regime. Here a series of experiments by dynamic-loading hat-shaped specimens using stopper rings to control the displacement are performed, and the alloy resists adiabatic shear-band formation up to a very large imposed shear strain of ~7. It is proposed that the combination of the excellent strain-hardening ability and moderate thermal-softening effect retard shear localization. Recrystallized ultrafine-grained grains (diameters of 100–300 nm) with twins are revealed inside the shear band. Their formation is explained by the rotational dynamic recrystallization mechanism. The stability of the structure at high strain rates strongly suggests a high ballistic resistance for this class of alloys.

View Accepted Manuscript (DOE)

Research Organization:: University of California, San Diego, La Jolla, CA (United States)

Sponsoring Organization:: China Scholarship Council; National Natural Science of China; Saudi Aramco; USDOE National Nuclear Security Administration (NNSA); University of California

Grant/Contract Number:: NA0002080

OSTI ID:: 1537905

Alternate ID(s):: OSTI ID: 22744586

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 151; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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