Effects of microscopic boundary conditions on the deformation behavior of small-volume metallic glasses

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Although large-volume metallic glasses (MGs) are susceptible to shear localization due to their intrinsically strain-softening response, recent experiments and molecular dynamics simulations have shown that small-volume MGs samples are able to exhibit work hardening response. Here, we seek to address two issues regarding the mechanical response of small-volume MGs at low homologous temperatures from a continuum-based modeling perspective: (1) are MGs capable of exhibiting a work hardening response, and (2) what is the physical mechanism which causes its work hardening response? Along with implementing a recently-developed finite-deformation, strain gradient plasticity-based constitutive model for MGs into a self-developed finite-element code, we study the tensile response of small-volume MG samples of various sizes through finite-element simulations. Our simulations show that small-volume MG samples are capable of exhibiting a work hardening response provided the following conditions are met: (a) the sample size is small enough, and (b) the appropriate microscopic boundary conditions for the free volume are imposed on the sample.

Original languageEnglish
Pages (from-to)4580-4595
Number of pages16
JournalInternational Journal of Solids and Structures
Volume51
Issue number25-26
DOIs
Publication statusPublished - 1 Dec 2014

Fingerprint

Metallic Glasses
Metallic glass
metallic glasses
Boundary conditions
boundary conditions
work hardening
Hardening
Strain hardening
Gradient Plasticity
Strain Softening
Strain Gradient
Finite Deformation
simulation
Free volume
Finite Element Simulation
Constitutive Model
Constitutive models
plastic properties
Molecular Dynamics Simulation
plastic deformation

Keywords

  • Amorphous metals
  • Constitutive model
  • Finite-elements
  • Microscopic boundary conditions
  • Strain gradient plasticity

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Applied Mathematics
  • Modelling and Simulation

Cite this

Effects of microscopic boundary conditions on the deformation behavior of small-volume metallic glasses. / G. Thamburaja, T Prakash; Liu, J.

In: International Journal of Solids and Structures, Vol. 51, No. 25-26, 01.12.2014, p. 4580-4595.

Research output: Contribution to journalArticle

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