期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 678, 期 -, 页码 410-420出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.03.305
关键词
Metallic glasses; Molecular dynamics simulations; Mechanical behavior; Non-localized deformation
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
- U.S. Army Research Office [W911NF-13-1-0438]
- National Science Foundation [CMMI-1100080]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1100080] Funding Source: National Science Foundation
metallic glasses (MGs), plastic deformation at room temperature is dominated by highly localized shear bands. Here we report the non-localized deformation under tension in CueZr multi-layer MGs with a pure amorphous structure using large-scale atomistic simulations. It is demonstrated that amorphous samples with high layer numbers, composed of Cu64Zr36 and Cu40Zr60, or Cu64Zr36 and Cu50Zr50, present obviously non-localized deformation behavior. We reveal that the deformation behavior of the multi-layer-structured MG films is related but not determined by the deformation behavior of the composed individual layers. The criterion for the deformation mode change for MGs with a pure amorphous structure, in generally, was suggested, i.e., the competition between the elastic-energy density stored and the energy density needed for forming one mature shear band in MGs. Our results provide a promising strategy for designing tensile ductile MGs with a pure amorphous structure at room temperature. (C) 2016 Elsevier B.V. All rights reserved.
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