期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 639, 期 -, 页码 131-138出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.03.158
关键词
Composite materials; Metallic glasses; Mechanical properties; Strain
资金
- Natural Science Basic Research Plan in Shaanxi Province of China [2014JM6234]
- Fundamental Research Fund of Northwestern Polytechnical University [JC20120203]
- Specialized Research Fund for the Doctoral Program of Higher Education [20136102120007]
- Program of Introducing Talents of Discipline to Universities [B08040]
- National Science Foundations [DMR-0909037, CMMI-0900271, CMMI-1100080]
- Department of Energy (DOE)
- NPU
- Chinese Scholarship Council (CSC)
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1100080] Funding Source: National Science Foundation
The deformation behavior of in-situ Ti48Zr20Nb12Cu5Be15 bulk-metallic-glass (BMG) composites was investigated upon dynamic deformation. The present BMG composite exhibits good dynamic mechanical properties, combining high fracture strength (1850 MPa) with remarkable plasticity (>10%) at the strain rate of 1.3 x 10(3) s(-1). Ductile to brittle transition occurs with the increase of strain rates, which can be ascribed to the deteriorated ability of dendrites to impede the propagation of shear bands at higher strain rates. An obvious positive to negative transition on strain rate dependence of flow stresses can be observed with the increasing strain rates. Detailed analysis reveals that the variation from the dendrite- dominated mechanism associated with dislocation movement to the matrix-dominated fracture related to thermal softening is responsible for the present transition. The constitutive equations based on their deformation mechanisms are established for describing the present transition. (C) 2015 Elsevier B. V. All rights reserved.
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