期刊
SCRIPTA MATERIALIA
卷 114, 期 -, 页码 93-97出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2015.12.012
关键词
Metallic glass; Molecular dynamic simulation; Mechanical; Behavior; Size effect
类别
资金
- National Key Basic Research Program of China [2012CB825700]
- National Natural Science Foundation of China [51371157, U14321056]
- Natural Science Foundation of Zhejiang Province [Z1110196, Y4110192]
- Fundamental Research Funds for the Central Universities
Molecular dynamics simulations were employed to investigate the specimen thickness-dependent tensile behavior of a series of Cu(x)Z(100-x) (x = 20, 40, 50, 64 and 80 at%) metallic glass (MG) films, with a particular focus on the critical thickness, tc, below which non-localized plastic flow takes place. The simulation results reveal that while the transition occurs in all the alloys examined, t(c) is sensitive to the composition. We rationalize t(c) by postulating that the strain energy stored in the sample at the onset of plastic deformation has to be sufficient for the formation of shear bands. The composition-dependence of t(c) was found to correlate with the average activation energy of the atomic level plastic deformation events. (C) 2015 Elsevier Ltd. All rights reserved.
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