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Superplasticity and superplastic forming ability of a Zr-Ti-Ni-Cu-Be bulk metallic glass in the supercooled liquid region |
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| Authors: | G Wang J Shen JF Sun J Zou ZH Stachurski |
| Institution: | a School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China b Department of Engineering, FEIT, Australian National University, ACT 0200, Australia c School of Engineering and Center for Microscopy and Microanalysis, University of Queensland, QLD 4066, Australia d Metals and Ceramic Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6115, USA |
| Abstract: | The superplastic deformation behavior and superplastic forming ability of the Zr41.25Ti13.75Ni10Cu12.5Be22.5 (at.%) bulk metallic glass (BMG) in the supercooled liquid region were investigated. The isothermal tensile results indicate that the BMG exhibits a Newtonian behavior at low strain rates but a non-Newtonian behavior at high-strain rates in the initial deformation stage. The maximum elongation reaches as high as 1624% at 656 K, and nanocrystallization was found to occur during the deformation process. Based on the analysis on tensile deformation, a gear-like micropart is successfully die-forged via a superplastic forging process, demonstrating that the BMG has excellent workability in the supercooled liquid region. |
| Keywords: | B180 F180 N102 P270 V120 |
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