Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 376, Issue -, Pages 145-151Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2013.05.036
Keywords
Bulk metallic glasses; Crystallization; High-temperature deformation; Process map; Warm extrusion
Funding
- Fundamental R&D Program for Core Technology of Materials [M-2009-01-0014]
- Ministry of Knowledge Economy, South Korea
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Crystallization and plastic deformation of a Cu49Zr45Al6 ternary bulk metallic glass were investigated within a supercooled liquid region. In isochronal annealing processes, effective activation energies for the primary crystallization of Cu49Zr45Al6 ternary bulk metallic glass were calculated to be over 367 kJ/mol, which is quite high compared with other Cu-Zr-based bulk metallic glasses. Based on isothermal transformation kinetics described by the Johnson-Mehl-Avrami model, Avrami exponent (n) was calculated to be between 2.52 and 3.50, indicating that crystallization mechanism showed a diffusion-controlled growth with increasing nucleation rate. The appropriate working temperature-strain rate combination for feasible solid-to-solid forming without in situ crystallization was deduced by constructing a process map superimposed on a time-temperature transformation curve, thereby indicating phase crystallization. Furthermore, the actual solid-to-solid formability around this processing window was confirmed by overlapping the laboratory-scale extrusion ability. (C) 2013 Elsevier B.V. All rights reserved.
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