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Effect of Dilatation on the Elasto-Plastic Response of Bulk Metallic Glasses Under Indentation

Published online by Cambridge University Press:  31 January 2011

Anamika Prasad ,
Ming Dao  and
Upadrasta Ramamurty
Anamika Prasad
Affiliation:
anamikaprasad@alum.mit.edu, Stanford University, Department of Bioengineering, Palo Alto, California, United States
Ming Dao
Affiliation:
mingdao@mit.edu, Massachusetts Institute of Technology, Department of Material Science and Engineering, Cambridge, Massachusetts, United States
Upadrasta Ramamurty
Affiliation:
satwiku@gmail.com, Indian Institute of Science, Department of Materials Engineering, Bangalore, Karnataka, India
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Abstract

Elasto-plastic response of bulk metallic glasses (BMGs) follows closely the response of granular materials through pressure dependent (or normal stress) yield locus and shear stress induced material dilatation. On a micro-structural level, material dilatation is responsible for stress softening and formation of localized shear band, however its influence on the macro-scale flow and deformation is largely unknown. In this work, we systematically analyze the effect of material dilatation on the gross indentation response of Zr-based BMG via finite element simulation. The strengthening/softening effect on the load-depth response and corresponding stress-strain profiles are presented in light of differences in elastic-plastic regimes under common indenters. Through comparison with existing experimental results, we draw conclusions regarding selection of suitable dilatation parameters for accurately predicting the gross response of BMGs

Keywords

amorphousnano-indentationstress/strain relationship
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1224: Symposia FF/GG – Mechanical Behavior at Small Scales — Experiments and Modeling , 2009 , 1224-GG04-07
Copyright
Copyright © Materials Research Society 2010

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