Deformation behavior of Zr-based bulk metallic glass and composite in the supercooled liquid region |
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| Authors: | Qi Chen Lin Liu K. C. Chan |
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| Affiliation: | (1) State Key Laboratory of Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China;(2) Department of Industrial and Systems Engineering, Hong Kong Polytechnic University, Hong Kong, China |
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| Abstract: | A Zr-based bulk metallic glass (BMG) with a composition of (Zr75Cu25)78.5Ta4Ni10Al7.5 and a bulk metallic glass matrix composite (BMGC) with a composition of (Zr75Cu25)74.5Ta8Ni10Al7.5 have been prepared by copper-mold casting. The compressive deformation behavior of the BMG and BMGC was investigated in the supercooled region at different temperatures and various strain rates ranging from 8×10−4 s−1 to 8×10−2 s−1. It was found that both the strain rate and test temperature significantly affect the deformation behavior of the two alloys. The deformation follows Newtonian flow at low strain rates but non-Newtonian flow at high strain rates. The deformation mechanism for the two kinds of alloys was discussed in terms of the transition state theory. Supported by the National Natural Science Foundation of China (grant Nos. 50471060 and 50635020) |
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| Keywords: | bulk metallic glass composites supercooled liquid region compressive deformation free volume |
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