Voronoi volume recovery during plastic deformation in deep-notched metallic glasses

W. Cui; J. Pan; D. J. Blackwood; Y. Li

doi:10.1016/j.jallcom.2018.10.238

Voronoi volume recovery during plastic deformation in deep-notched metallic glasses

W. Cui
, J. Pan^*
, D. J. Blackwood
, Y. Li

^*Corresponding author for this work

National University of Singapore
CAS - Institute of Metal Research

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

15 Scopus citations

Abstract

Many previous simulations of the plastic deformation in metallic glasses showed that shear banding is the dominant mode accompanied by Voronoi volume continuous generation and softening. In the present work, we report a contrary phenomenon where Voronoi volume recovery is dominant during plastic deformation in CuZr metallic glasses under tension. By creating a notched geometry, the deformation mode of notched samples transits from shear banding to necking due to the introduction of triaxial stress state. With the suppressing of shear banding, a notch strengthening and structure ordering phenomenon together with the recovery of Cu-centered full-icosahedra fraction are also observed. The present work enriches our understanding on the mechanical behavior and deformation mechanism of metallic glasses.

Original language	English
Pages (from-to)	460-468
Number of pages	9
Journal	Journal of Alloys and Compounds
Volume	776
DOIs	https://doi.org/10.1016/j.jallcom.2018.10.238
State	Published - 5 Mar 2019
Externally published	Yes

Keywords

Metallic glass
Molecular dynamics simulation
Plastic deformation
Triaxial stress state
Voronoi volume

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10.1016/j.jallcom.2018.10.238

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title = "Voronoi volume recovery during plastic deformation in deep-notched metallic glasses",

abstract = "Many previous simulations of the plastic deformation in metallic glasses showed that shear banding is the dominant mode accompanied by Voronoi volume continuous generation and softening. In the present work, we report a contrary phenomenon where Voronoi volume recovery is dominant during plastic deformation in CuZr metallic glasses under tension. By creating a notched geometry, the deformation mode of notched samples transits from shear banding to necking due to the introduction of triaxial stress state. With the suppressing of shear banding, a notch strengthening and structure ordering phenomenon together with the recovery of Cu-centered full-icosahedra fraction are also observed. The present work enriches our understanding on the mechanical behavior and deformation mechanism of metallic glasses.",

keywords = "Metallic glass, Molecular dynamics simulation, Plastic deformation, Triaxial stress state, Voronoi volume",

author = "W. Cui and J. Pan and Blackwood, \{D. J.\} and Y. Li",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2019",

month = mar,

day = "5",

doi = "10.1016/j.jallcom.2018.10.238",

language = "英语",

volume = "776",

pages = "460--468",

journal = "Journal of Alloys and Compounds",

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TY - JOUR

T1 - Voronoi volume recovery during plastic deformation in deep-notched metallic glasses

AU - Cui, W.

AU - Pan, J.

AU - Blackwood, D. J.

AU - Li, Y.

PY - 2019/3/5

Y1 - 2019/3/5

N2 - Many previous simulations of the plastic deformation in metallic glasses showed that shear banding is the dominant mode accompanied by Voronoi volume continuous generation and softening. In the present work, we report a contrary phenomenon where Voronoi volume recovery is dominant during plastic deformation in CuZr metallic glasses under tension. By creating a notched geometry, the deformation mode of notched samples transits from shear banding to necking due to the introduction of triaxial stress state. With the suppressing of shear banding, a notch strengthening and structure ordering phenomenon together with the recovery of Cu-centered full-icosahedra fraction are also observed. The present work enriches our understanding on the mechanical behavior and deformation mechanism of metallic glasses.

AB - Many previous simulations of the plastic deformation in metallic glasses showed that shear banding is the dominant mode accompanied by Voronoi volume continuous generation and softening. In the present work, we report a contrary phenomenon where Voronoi volume recovery is dominant during plastic deformation in CuZr metallic glasses under tension. By creating a notched geometry, the deformation mode of notched samples transits from shear banding to necking due to the introduction of triaxial stress state. With the suppressing of shear banding, a notch strengthening and structure ordering phenomenon together with the recovery of Cu-centered full-icosahedra fraction are also observed. The present work enriches our understanding on the mechanical behavior and deformation mechanism of metallic glasses.

KW - Metallic glass

KW - Molecular dynamics simulation

KW - Plastic deformation

KW - Triaxial stress state

KW - Voronoi volume

UR - https://www.scopus.com/pages/publications/85055753264

U2 - 10.1016/j.jallcom.2018.10.238

DO - 10.1016/j.jallcom.2018.10.238

M3 - 文章

AN - SCOPUS:85055753264

SN - 0925-8388

VL - 776

SP - 460

EP - 468

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Voronoi volume recovery during plastic deformation in deep-notched metallic glasses

Abstract

Keywords

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