期刊
INTERMETALLICS
卷 30, 期 -, 页码 65-71出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2012.03.036
关键词
Glasses; metallic; Mechanical properties at ambient temperature; Elastic properties; Mechanical testing
资金
- National High Technology and Development Program of China (863 Program) [2007AA03Z520]
- National Nature Science Foundation of China [50871006]
- Research Grants Council of the Hong Kong Government [B-Q08V]
The initial elastic deformation of bulk metallic glasses (BMGs) with various casting diameters and annealing conditions was investigated by nanoindentation test with a spherical indenter. It was found that with the increasing of the glassy rod diameter and the annealing temperature, the onset slope of nanoindentation plot remarkably increased. The BMGs with various casting diameters and annealing temperatures are of different atomic configuration due to their different cooling rate during casting and different structural relaxation processes during annealing, respectively, indicating that the onset slope of nanoindentation plot is strangely dependent on the atomic configuration. Therefore, the onset slope of nanoindentation plot may serve as an indicator of the initial deformation behavior of BMGs. The structual origin of the initial elastic deformation was discussed in terms of short order nature in glasses and the distribution of free volume. (C) 2012 Elsevier Ltd. All rights reserved.
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