期刊
ACTA MATERIALIA
卷 57, 期 3, 页码 881-892出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.10.027
关键词
Bulk metallic glasses; Inhomogeneous deformation; Strain rate sensitivity; Deformation kinetics; Activation volume
资金
- Swiss National Science Foundation [200021-108071, 200020-120258]
- Swiss National Science Foundation (SNF) [200020-120258] Funding Source: Swiss National Science Foundation (SNF)
This study presents results oil the mechanical properties of Zr-based bulk metallic glasses over it wide range of temperatures (77-673 K) and strain rates (3.3 x 10(-5) - 0.2 s(-1)), and provides novel information on the kinetics of inhomogeneous deformation in metallic glasses. The disappearance of serrated flow, i.e. temporal homogenization, below a critical temperature and above a critical strain rate corresponds to a transition of the asymptotic strain rate sensitivity (SRS) from negative to positive values. Based oil thermally activated shear processes a temperature and strain rate dependent deformation model is presented that includes a time-varying state variable which represents the local degree or relaxation in the shear band after a shear event has taken place. The model makes possible a theoretical description of the observed SRS and the spatio-temporal evolution of plastic deformation in metallic glasses. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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