Ductility by shear band delocalization in the nano-layer of gradient structure

Fuping Yuan; Dingshun Yan; Jiangda Sun; Lingling Zhou; Yuntian Zhu; Xiaolei Wu

doi:10.1080/21663831.2018.1546238

Ductility by shear band delocalization in the nano-layer of gradient structure

Fuping Yuan, Dingshun Yan, Jiangda Sun, Lingling Zhou, Yuntian Zhu^*, Xiaolei Wu^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

127 Citations (Scopus)

52 Downloads (CityUHK Scholars)

Abstract

Nanostructured (NS) metals typically fail soon after yielding, starting with the formation of narrow shear bands. Here we report the observation of shear band delocalization in gradient metals. Shear bands were nucleated and delocalized in the NS layers by propagating along the gage length soon after yielding, converting the shear band into a localized strain zone (LSZ). Synergistic work hardening was developed in the LSZ by regaining dislocation hardening capability, and by back-stress hardening from the strain gradients in the axial and depth directions, which helped with enhancing global ductility.

Original language	English
Pages (from-to)	12-17
Journal	Materials Research Letters
Volume	7
Issue number	1
Online published	19 Nov 2018
DOIs	https://doi.org/10.1080/21663831.2018.1546238
Publication status	Published - 2019
Externally published	Yes

Research Keywords

back-stress hardening
ductility
Gradient structure
shear band
strain delocalization

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This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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title = "Ductility by shear band delocalization in the nano-layer of gradient structure",

abstract = "Nanostructured (NS) metals typically fail soon after yielding, starting with the formation of narrow shear bands. Here we report the observation of shear band delocalization in gradient metals. Shear bands were nucleated and delocalized in the NS layers by propagating along the gage length soon after yielding, converting the shear band into a localized strain zone (LSZ). Synergistic work hardening was developed in the LSZ by regaining dislocation hardening capability, and by back-stress hardening from the strain gradients in the axial and depth directions, which helped with enhancing global ductility.",

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author = "Fuping Yuan and Dingshun Yan and Jiangda Sun and Lingling Zhou and Yuntian Zhu and Xiaolei Wu",

year = "2019",

doi = "10.1080/21663831.2018.1546238",

language = "English",

volume = "7",

pages = "12--17",

journal = "Materials Research Letters",

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T1 - Ductility by shear band delocalization in the nano-layer of gradient structure

AU - Yuan, Fuping

AU - Yan, Dingshun

AU - Sun, Jiangda

AU - Zhou, Lingling

AU - Zhu, Yuntian

AU - Wu, Xiaolei

PY - 2019

Y1 - 2019

N2 - Nanostructured (NS) metals typically fail soon after yielding, starting with the formation of narrow shear bands. Here we report the observation of shear band delocalization in gradient metals. Shear bands were nucleated and delocalized in the NS layers by propagating along the gage length soon after yielding, converting the shear band into a localized strain zone (LSZ). Synergistic work hardening was developed in the LSZ by regaining dislocation hardening capability, and by back-stress hardening from the strain gradients in the axial and depth directions, which helped with enhancing global ductility.

AB - Nanostructured (NS) metals typically fail soon after yielding, starting with the formation of narrow shear bands. Here we report the observation of shear band delocalization in gradient metals. Shear bands were nucleated and delocalized in the NS layers by propagating along the gage length soon after yielding, converting the shear band into a localized strain zone (LSZ). Synergistic work hardening was developed in the LSZ by regaining dislocation hardening capability, and by back-stress hardening from the strain gradients in the axial and depth directions, which helped with enhancing global ductility.

KW - back-stress hardening

KW - ductility

KW - Gradient structure

KW - shear band

KW - strain delocalization

KW - back-stress hardening

KW - ductility

KW - Gradient structure

KW - shear band

KW - strain delocalization

KW - back-stress hardening

KW - ductility

KW - Gradient structure

KW - shear band

KW - strain delocalization

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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85056903018&origin=recordpage

U2 - 10.1080/21663831.2018.1546238

DO - 10.1080/21663831.2018.1546238

M3 - RGC 21 - Publication in refereed journal

SN - 2166-3831

VL - 7

SP - 12

EP - 17

JO - Materials Research Letters

JF - Materials Research Letters

IS - 1

ER -

Ductility by shear band delocalization in the nano-layer of gradient structure

Abstract

Research Keywords

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