Crack branching instability and directional stability in dynamic fracture of a tough bulk metallic glass |
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| Authors: | M.Q. Jiang J.X. Meng V. Keryvin L.H. Dai |
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| Affiliation: | 1. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China;2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, People’s Republic of China;3. Applied Mechanics Laboratory of the University of Rennes 1, LARMAUR, ERL CNRS 6274, Campus de Beaulieu, 35042 Rennes cedex, France;4. Department of Materials Engineering, LIMATB, EA4250, Université de Bretagne-Sud, Centre de recherche de St Maudé, 56321 Lorient cedex, France |
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| Abstract: | We report the ductile fracture behavior of a tough Zr-based bulk metallic glass (BMG) in the dynamic regime, where a rapid moving crack initiates by a Mode II shearing and then advances through plastic voids growth and linking. A clear fractographic evolution from river-like vein pattern to chevron-like zone where microscopic dimples and voids coexist, followed by crack microbranching pattern, was observed on the dynamic fracture surfaces. A terminal crack velocity of about 0.5 of the Rayleigh wave velocity was determined for the onset of such microbranching instability. Furthermore, the dynamic branched daughter cracks are favored to continue in their original mother crack plane, having “directional stability”. Our findings may increase the understanding of the dynamic fracture of BMGs with both glassy nature and metallic bonding character. |
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