Strain rate-dependent shear band behavior in bulk metallic glasses

M.Q. Jiang; L.H. Dai

doi:doi:10.1051/dymat/2009139

All issues

Volume 2 (2009)

10.1051/dymat/2009139

Abstract

Issue		DYMAT 2009 Volume 2, 2009 DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading


Page(s)		993 - 998
Section		Micro-Structural Effects
DOI		https://doi.org/10.1051/dymat/2009139
Published online		15 September 2009

DYMAT 2009 (2009) 993-998
DOI: 10.1051/dymat/2009139

Strain rate-dependent shear band behavior in bulk metallic glasses

M.Q. Jiang and L.H. Dai

State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, PR China

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Published online: 15 September 2009

Abstract
In this article, we review our recent advances in understanding the deformation behavior of a typical tough Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 (Vit 1) bulk metallic glass (BMG), as a model material, under various loading modes and strain rates, focusing particularly on the rate-dependence and formation mechanism of shear-banding. Dynamic and quasi-static mechanical experiments, including plate shear, shear punch and spherical indentation, and continuum as well as atomistic modeling on shear-banding are discussed. The results demonstrate that higher strain rate slows down the annihilation process of free volume, but promotes the free-volume coalescence, which is responsible for the rate-dependent shear banding. The physical origin of shear bands, that is the free volume softening underpinned by irreversible rearrangements of atoms, is unveiled. Finally, some concluding remarks are given.