Deformation nanotwins suppress shear banding during impact test of CrCoNi medium-entropy alloy

Xiaolei Wu; Muxin Yang; Ping Jiang; Chang Wang; Lingling Zhou; Fuping Yuan; Evan Ma

doi:10.1016/j.scriptamat.2019.12.017

Deformation nanotwins suppress shear banding during impact test of CrCoNi medium-entropy alloy

Xiaolei Wu
, Muxin Yang
, Ping Jiang
, Chang Wang
, Lingling Zhou
, Fuping Yuan
, Evan Ma

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

72 Scopus citations

Abstract

We report deformation bands ahead of the crack tip in a CrCoNi alloy under impact loading, and analyze the effects of deformation twinning on strain localization in the form of shear banding. Due to low stacking fault energy, upon high-strain-rate deformation this medium-entropy alloy forms twins with thickness and spacing of only a few nanometers. These nano-twins are embedded dynamically not only ahead of any developing shear band to retard its advance, but also in its interior to work harden. This dual effect helps to suppress runaway shear banding instability that instigates failure and contributes to the energy absorption as recorded in instrumented Charpy tests.

Original language	English
Pages (from-to)	452-456
Number of pages	5
Journal	Scripta Materialia
Volume	178
DOIs	https://doi.org/10.1016/j.scriptamat.2019.12.017
State	Published - 15 Mar 2020
Externally published	Yes

Keywords

Impact toughness
Medium-entropy alloy
Nano-twin
Shear-band
Strain hardening

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10.1016/j.scriptamat.2019.12.017

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title = "Deformation nanotwins suppress shear banding during impact test of CrCoNi medium-entropy alloy",

abstract = "We report deformation bands ahead of the crack tip in a CrCoNi alloy under impact loading, and analyze the effects of deformation twinning on strain localization in the form of shear banding. Due to low stacking fault energy, upon high-strain-rate deformation this medium-entropy alloy forms twins with thickness and spacing of only a few nanometers. These nano-twins are embedded dynamically not only ahead of any developing shear band to retard its advance, but also in its interior to work harden. This dual effect helps to suppress runaway shear banding instability that instigates failure and contributes to the energy absorption as recorded in instrumented Charpy tests.",

keywords = "Impact toughness, Medium-entropy alloy, Nano-twin, Shear-band, Strain hardening",

author = "Xiaolei Wu and Muxin Yang and Ping Jiang and Chang Wang and Lingling Zhou and Fuping Yuan and Evan Ma",

note = "Publisher Copyright: {\textcopyright} 2019",

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doi = "10.1016/j.scriptamat.2019.12.017",

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T1 - Deformation nanotwins suppress shear banding during impact test of CrCoNi medium-entropy alloy

AU - Wu, Xiaolei

AU - Yang, Muxin

AU - Jiang, Ping

AU - Wang, Chang

AU - Zhou, Lingling

AU - Yuan, Fuping

AU - Ma, Evan

PY - 2020/3/15

Y1 - 2020/3/15

N2 - We report deformation bands ahead of the crack tip in a CrCoNi alloy under impact loading, and analyze the effects of deformation twinning on strain localization in the form of shear banding. Due to low stacking fault energy, upon high-strain-rate deformation this medium-entropy alloy forms twins with thickness and spacing of only a few nanometers. These nano-twins are embedded dynamically not only ahead of any developing shear band to retard its advance, but also in its interior to work harden. This dual effect helps to suppress runaway shear banding instability that instigates failure and contributes to the energy absorption as recorded in instrumented Charpy tests.

AB - We report deformation bands ahead of the crack tip in a CrCoNi alloy under impact loading, and analyze the effects of deformation twinning on strain localization in the form of shear banding. Due to low stacking fault energy, upon high-strain-rate deformation this medium-entropy alloy forms twins with thickness and spacing of only a few nanometers. These nano-twins are embedded dynamically not only ahead of any developing shear band to retard its advance, but also in its interior to work harden. This dual effect helps to suppress runaway shear banding instability that instigates failure and contributes to the energy absorption as recorded in instrumented Charpy tests.

KW - Impact toughness

KW - Medium-entropy alloy

KW - Nano-twin

KW - Shear-band

KW - Strain hardening

UR - https://www.scopus.com/pages/publications/85076696146

U2 - 10.1016/j.scriptamat.2019.12.017

DO - 10.1016/j.scriptamat.2019.12.017

M3 - 文章

AN - SCOPUS:85076696146

SN - 1359-6462

VL - 178

SP - 452

EP - 456

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Deformation nanotwins suppress shear banding during impact test of CrCoNi medium-entropy alloy

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Keywords

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