期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 317, 期 1-2, 页码 181-186出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-3093(02)01997-X
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The plane strain fracture toughness of a Zr-Ti-Ni-Cu-Be bulk metallic glass was found to be significantly degraded after annealing at 300 degreesC. The fracture morphology was changed from characteristic vein patterns to cleavage-like features with little evidence of plasticity. Positron annihilation spectroscopy results revealed that atomic scale open-volume regions were reduced by annealing. A dynamic mechanical analysis showed that the atomic arrangement process for viscous flow was retarded as a result of annealing. The observed annealing embrittlement is ascribed to the loss of stress relief by viscous flow at the crack tip that results from the anneal-out of open-volume regions (C) 2003 Elsevier Science B.V. All rights reserved.
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