Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 492, Issue -, Pages 140-145Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2018.04.026
Keywords
Rheological behavior; Processing map; The supercooled liquid region; High temperature compression; Hot processing
Funding
- National Natural Science Foundation of China [51661016, 51571105, 51551101, 51661017, 51661015]
- Wenzhou public welfare science and technology project [G20170019]
- Natural Science Foundation of Gansu Province [145RJZA090, 16061JZA050]
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In this paper, the rheological behavior and thermoplastic deformation of Zr61.88Cu18Ni10.12Al10 bulk metallic glasses (BMGs) in the supercooled liquid region (SCLR) were studied by high temperature compression tests and a processing map was constructed. The results indicated that the flow stress of present alloy in the SCLR is very sensitive to temperature and strain-rate. The flow stress decreases with increasing temperature and decreasing strain-rate. The viscosity coefficient of the present alloy ranges from 10(11) Pa.s to 10(9) Pa.s and decreases with increasing temperature and strain-rate. When the strain-rate is greater than 5 x 10(-3) s(-1), the Zr61.88Cu18Ni10.12Al10 alloy undergoes a transition from Newtonian fluid to non-Newtonian fluid. The surface profile exhibited a similar shape of the letter 'N' after high temperature compression in the deeply SCLR. The optimum hot processing region of Zr61.88Cu18Ni10.12Al10 alloy is 688 K-708 K with a low strain-rate and 708 K-723 K with a high strain-rate.
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