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Study of mechanical deformation in bulk metallic glass through instrumented indentation

Vaidyanathan, R. and Dao, M. and Ravichandran, G. and Suresh, S. (2001) Study of mechanical deformation in bulk metallic glass through instrumented indentation. Acta Materialia, 49 (18). pp. 3781-3789. ISSN 1359-6454. doi:10.1016/S1359-6454(01)00263-4.

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Instrumented sharp indentation experiments at the nano- and micro-length scales were carried out in an attempt to quantify the deformation characteristics of Vitreloy 1 bulk metallic glass. The experiments were accompanied by detailed three-dimensional finite element simulations of instrumented indentation to formulate an overall constitutive response. By matching the experimentally observed continuous indentation results with the finite element predictions, a general Mohr–Coulomb type constitutive description was extracted to capture the dependence of multiaxial deformation on both shear stresses and normal stresses. This constitutive response is able to provide accurate predictions of the evolution of shear bands seen in uniaxial compression tests. Constrained deformation of the material around the indenter results in incomplete circular patterns of shear bands whose location, shape and size are also captured well by the numerical simulations. The analysis is also able to predict the extent of material pile-up observed around the indenter. The surface deformation features are also consistent with mechanisms such as localized shear flow, serrated yielding and adiabatic heating, which are observed during macroscopic mechanical tests.

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URLURL TypeDescription DOIArticle
Ravichandran, G.0000-0002-2912-0001
Additional Information:© 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. Received 14 March 2001; accepted 5 July 2001. The authors are grateful to T.-G. Nieh, B.W. Choi, K.J. Van Vliet, J. Smith and A. Gouldstone for valuable experimental assistance, and to W.L. Johnson and J. Lu for providing the specimens. Useful discussions with F. Spaepen are also gratefully acknowledged. GR would like to thank the Army Research Office and the NSF MRSEC program for the support of his research in bulk metallic glasses (BMG).
Funding AgencyGrant Number
Army Research Office (ARO)UNSPECIFIED
Subject Keywords:Amorphous metals; Bulk metallic glasses; Indentation; Nanoindentation; Finite element method
Issue or Number:18
Record Number:CaltechAUTHORS:20150227-132131666
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Official Citation:R. Vaidyanathan, M. Dao, G. Ravichandran, S. Suresh, Study of mechanical deformation in bulk metallic glass through instrumented indentation, Acta Materialia, Volume 49, Issue 18, 26 October 2001, Pages 3781-3789, ISSN 1359-6454, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55340
Deposited By: Cheryl Gause
Deposited On:03 Mar 2015 00:45
Last Modified:10 Nov 2021 20:45

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