期刊
ACTA MATERIALIA
卷 58, 期 20, 页码 6736-6743出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.08.039
关键词
Metallic glasses; Serrated plastic flow; Shear bands; Acoustic emission
The mechanical behavior and the kinetics of shear banding in bulk metallic glasses was investigated at room and liquid nitrogen temperature using the acoustic emission (AE) technique. It was demonstrated that the intensive AE reflecting the activity of strongly localized shear bands at room temperature vanishes at the transition of plastic flow from serrated to non-serrated with a reduction in temperature. The disappearance of AE clearly suggests that the shear band propagation velocity significantly decreases at low temperature, and sliding along the principle shear band is observed at the machine-driven rate. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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