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Dynamics of shear localization and stress relaxation in amorphous Cu50Ti50
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Dynamics of shear localization and stress relaxation in amorphous Cu50Ti50 M. Neudecker, a, and S.G. Mayra, aI. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany Received 24 October 2008; revised 17 November 2008; accepted 18 November 2008. Available online 30 December 2008. Abstract 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. Keywords: MD-simulations; Metallic glasses; Deformation inhomogeneities; Low-temperature deformation http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TW8-4V8D8T3-3-9&_cdi=5556&_user=2307902&_orig=browse&_coverDate=12%2F30%2F2008&_sk=999999999&view=c&wchp=dGLbVlz-zSkzk&md5=242e2f4be77fc099ec8e8ac8f62664db&ie=/sdarticle.pdf |
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