期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.194301
关键词
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资金
- Minerva Foundation
- Federal German Ministry for Education and Research
- Israel Science Foundation [712/12]
- Harold Perlman Family Foundation
- William Z. and Eda Bess Novick Young Scientist Fund
- Office of Science, Computational and Technology Research, U.S. Department of Energy [DE-AC02-05CH11231]
Quantitative understanding of the fracture toughness of metallic glasses, including the associated ductile-to-brittle (embrittlement) transitions, is not yet available. Here, we use a simple model of plastic deformation in glasses, coupled to an advanced Eulerian level set formulation for solving complex free-boundary problems, to calculate the fracture toughness of metallic glasses as a function of the degree of structural relaxation corresponding to different annealing times near the glass temperature. Our main result indicates the existence of an elastoplastic crack tip instability for sufficiently relaxed glasses, resulting in a marked drop in the toughness, which we interpret as annealing-induced embrittlement transition similar to experimental observations.
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