Adiabatic shear localization in the CrMnFeCoNi high-entropy alloy

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

doi:10.1016/j.actamat.2018.03.040

Adiabatic shear localization in the CrMnFeCoNi high-entropy alloy

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

192 Citations (Scopus)

Abstract

The mechanical behavior of the single phase (fcc) CrMnFeCoNi high-entropy alloy (HEA) is examined in the dynamic regime. 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.

Original language	English
Pages (from-to)	424-431
Number of pages	8
Journal	Acta Materialia
Volume	151
DOIs	https://doi.org/10.1016/j.actamat.2018.03.040
Publication status	Published - 1 Jun 2018
Externally published	Yes

Keywords

Adiabatic shear band
Mechanical response
The CrMnFeCoNi HEA

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10.1016/j.actamat.2018.03.040

Cite this

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title = "Adiabatic shear localization in the CrMnFeCoNi high-entropy alloy",

abstract = "The mechanical behavior of the single phase (fcc) CrMnFeCoNi high-entropy alloy (HEA) is examined in the dynamic regime. 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.",

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T1 - Adiabatic shear localization in the CrMnFeCoNi high-entropy alloy

AU - Li, Zezhou

AU - Zhao, Shiteng

AU - Alotaibi, Senhat M.

AU - Liu, Yong

AU - Wang, Bingfeng

AU - Meyers, Marc A.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - The mechanical behavior of the single phase (fcc) CrMnFeCoNi high-entropy alloy (HEA) is examined in the dynamic regime. 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.

AB - The mechanical behavior of the single phase (fcc) CrMnFeCoNi high-entropy alloy (HEA) is examined in the dynamic regime. 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.

KW - Adiabatic shear band

KW - Mechanical response

KW - The CrMnFeCoNi HEA

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DO - 10.1016/j.actamat.2018.03.040

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VL - 151

SP - 424

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JO - Acta Materialia

JF - Acta Materialia

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Adiabatic shear localization in the CrMnFeCoNi high-entropy alloy

Abstract

Keywords

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