Incipient Plasticity and Shear Band Formation in Bulk Metallic Glass Studied Using Indentation |
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| Authors: | Anantha Puthucode Rajarshi Banerjee Suman Vadlakonda Reza Mirshams Michael J Kaufman |
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| Affiliation: | (1) Department of Materials Science and Engineering, University of North Texas, Denton, Texas, USA;(2) College of Engineering, University of North Texas, Denton, Texas, USA |
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| Abstract: | This study focuses on investigating certain aspects of deformation in bulk metallic glasses (BMGs) based on nanoindentaion
and microindentation studies. Using a Berkovich indenter in nanoindentation, the incipient plasticity or early stages of deformation
have been studied for a typical BMG, Vitreloy 1. From a critical analysis of the load-displacement curves, the initial displacement
burst, often associated with the initiation of shear bands, was found to occur at a value close to the theoretical shear stress
of the material. The deformation behavior below these indents, including the formation of shear bands, has been investigated
by transmission electron microscopy. The evidence suggests structural changes associated with possible expansion of free volume
within the shear bands, especially in the case of deformation under higher loads. Furthermore, while the possibility of nanocrystallization
within the shear bands cannot be ruled out, the experimental results do not conclusively indicate the occurrence of such a
phenomenon.
This article is based on a presentation given in the symposium entitled “Materials Behavior: Far from Equilibrium” as part
of the Golden Jubilee Celebration of Bhabha Atomic Research Centre, which occurred December 15–16, 2006 in Mumbai, India.
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