Strain rate-dependent shear band behavior in bulk metallic glasses |

Issue		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		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

lhdai@lnm.imech.ac.cn

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.

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