Dynamics of shear localization and stress relaxation in amorphous Cu50Ti50

Dynamic heterogeneities in metallic glasses are investigated for the model glass Cu50Ti50 with the help of classical molecular dynamics computer simulations. By rapid quenching from melt at various cooling rates (spanning five orders of magnitude), differently relaxed amorphous cells are prepared. D...

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Bibliographic Details
Published in:Acta materialia 2009-03, Vol.57 (5), p.1437-1441
Main Authors: NEUDECKER, M, MAYR, S. G
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Metals. Metallurgy
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Summary:Dynamic heterogeneities in metallic glasses are investigated for the model glass Cu50Ti50 with the help of classical molecular dynamics computer simulations. By rapid quenching from melt at various cooling rates (spanning five orders of magnitude), differently relaxed amorphous cells are prepared. During subsequent shearing at, we observe a series of highly localized shear events, termed shear transformation zones (STZs). Detailed analysis focuses on the dynamics of STZ formation and the correlation with local properties. We identify a local mechanical stress bias as the physical origin of STZ formation during low-temperature shear deformation.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2008.11.032