Effects of pores on shear bands in metallic glasses : a molecular dynamics study

Jiangting Wang; Peter D. Hodgson; Jingde Zhang; Wenyi Yan; Chunhui Yang

doi:10.1016/j.commatsci.2010.08.001

Effects of pores on shear bands in metallic glasses : a molecular dynamics study

Jiangting Wang, Peter D. Hodgson, Jingde Zhang, Wenyi Yan, Chunhui Yang

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

50 Citations (Scopus)

Abstract

The effects of nanoscale pores on the strength and ductility of porous Cu46Zr54 metallic glasses during nanoindentation and uniaxial compression tests are modelled and investigated using molecular dynamics (MD) simulations. In the MD simulations, atomistic amorphous samples were digitally prepared through fast quenching from the liquid states of copper and zirconium alloy. In both of the nanoindentation and uniaxial compression simulations, shear transformation zones and shear bands are observed through the local deviatoric shear strains in the samples. The results show that the existence of pores causes strain concentrations and greatly promotes the initialization and propagation of shear bands. Importantly, only pores reaching critical size can effectively facilitate the formation of multiple shear bands. It is also observed that hardening occurs through pore annihilation and the shear band stops in porous metallic glasses.

Original language	English
Pages (from-to)	211-217
Number of pages	7
Journal	Computational Materials Science
Volume	50
Issue number	1
DOIs	https://doi.org/10.1016/j.commatsci.2010.08.001
Publication status	Published - 2010

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title = "Effects of pores on shear bands in metallic glasses : a molecular dynamics study",

abstract = "The effects of nanoscale pores on the strength and ductility of porous Cu46Zr54 metallic glasses during nanoindentation and uniaxial compression tests are modelled and investigated using molecular dynamics (MD) simulations. In the MD simulations, atomistic amorphous samples were digitally prepared through fast quenching from the liquid states of copper and zirconium alloy. In both of the nanoindentation and uniaxial compression simulations, shear transformation zones and shear bands are observed through the local deviatoric shear strains in the samples. The results show that the existence of pores causes strain concentrations and greatly promotes the initialization and propagation of shear bands. Importantly, only pores reaching critical size can effectively facilitate the formation of multiple shear bands. It is also observed that hardening occurs through pore annihilation and the shear band stops in porous metallic glasses.",

author = "Jiangting Wang and Hodgson, {Peter D.} and Jingde Zhang and Wenyi Yan and Chunhui Yang",

year = "2010",

doi = "10.1016/j.commatsci.2010.08.001",

language = "English",

volume = "50",

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journal = "Computational Materials Science",

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TY - JOUR

T1 - Effects of pores on shear bands in metallic glasses : a molecular dynamics study

AU - Wang, Jiangting

AU - Hodgson, Peter D.

AU - Zhang, Jingde

AU - Yan, Wenyi

AU - Yang, Chunhui

PY - 2010

Y1 - 2010

N2 - The effects of nanoscale pores on the strength and ductility of porous Cu46Zr54 metallic glasses during nanoindentation and uniaxial compression tests are modelled and investigated using molecular dynamics (MD) simulations. In the MD simulations, atomistic amorphous samples were digitally prepared through fast quenching from the liquid states of copper and zirconium alloy. In both of the nanoindentation and uniaxial compression simulations, shear transformation zones and shear bands are observed through the local deviatoric shear strains in the samples. The results show that the existence of pores causes strain concentrations and greatly promotes the initialization and propagation of shear bands. Importantly, only pores reaching critical size can effectively facilitate the formation of multiple shear bands. It is also observed that hardening occurs through pore annihilation and the shear band stops in porous metallic glasses.

AB - The effects of nanoscale pores on the strength and ductility of porous Cu46Zr54 metallic glasses during nanoindentation and uniaxial compression tests are modelled and investigated using molecular dynamics (MD) simulations. In the MD simulations, atomistic amorphous samples were digitally prepared through fast quenching from the liquid states of copper and zirconium alloy. In both of the nanoindentation and uniaxial compression simulations, shear transformation zones and shear bands are observed through the local deviatoric shear strains in the samples. The results show that the existence of pores causes strain concentrations and greatly promotes the initialization and propagation of shear bands. Importantly, only pores reaching critical size can effectively facilitate the formation of multiple shear bands. It is also observed that hardening occurs through pore annihilation and the shear band stops in porous metallic glasses.

UR - http://handle.uws.edu.au:8081/1959.7/557415

U2 - 10.1016/j.commatsci.2010.08.001

DO - 10.1016/j.commatsci.2010.08.001

M3 - Article

SN - 0927-0256

VL - 50

SP - 211

EP - 217

JO - Computational Materials Science

JF - Computational Materials Science

IS - 1

ER -

Effects of pores on shear bands in metallic glasses : a molecular dynamics study

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