Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-29T07:42:47.006Z Has data issue: false hasContentIssue false
  • English
  • Français

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:
[email protected], Stanford University, Department of Bioengineering, Palo Alto, California, United States
Ming Dao
Affiliation:
[email protected], Massachusetts Institute of Technology, Department of Material Science and Engineering, Cambridge, Massachusetts, United States
Upadrasta Ramamurty
Affiliation:
[email protected], Indian Institute of Science, Department of Materials Engineering, Bangalore, Karnataka, India
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Schuh, C.A., Hufnagel, T.C, and Ramamurty, U., Acta Mat. 55 (12), 4067–4109 (2007).Google Scholar
2 Ashby, M. and Greer, A., Scripta Mat. 54 (3), 321–326 (2006).Google Scholar
3 Vaidyanathan, R., Dao, M., Ravichandran, G., Suresh, S., Acta Mat. 49 (18), 3781–3789 (2001)Google Scholar
4 Giannakoulos, A.E and Suresh, S., Scripta Mat. 40 (10), 1191–1198 (1999).Google Scholar
5 Keryvin, V., Crosnierl, R., Laniel, R., Hoang, V.H., and Sangleboeuf, J.C.. J. Phys. D: Applied Phys. 41, (2008).Google Scholar
6 Prasad, A., Raghavan, R., Bellemare, S., Dao, M., Suresh, S., and Ramamurty, U. (under progress journal article).Google Scholar
7 Anand, L. and Su, C., Journal of the Mechanics and Physics of Solids, 53, 1362–1396 (2005).Google Scholar