Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 651, Issue -, Pages 698-707Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.10.113
Keywords
High-entropy alloy; Hot deformation; Microstructure evolution; Dynamic recrystallization
Categories
Funding
- 973 project [2011CB610406]
- National Natural Science Foundation of China [51425402]
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The hot deformation characteristics of dynamic recrystallization (DRX) of the MoNbHfZrTi refractory high-entropy alloy (HEA) was investigated using the isothermal compression tests in the strain rate of 0.001-0.1 s(-1) at the temperature range of 800-1200 degrees C. Scanning electron microscope (SEM) with the electron backscatter diffraction (EBSD) technique was used to study the effect of deformation temperature and strain rate on the stress-strain behavior, microstructure evolution and dynamic recrystallization (DRX) during hot deformation. At 800 degrees C, the stress-strain curve exhibits a work-hardening stage until fracture at the strain rate of 0.1 s(-1) and 0.01 s(-1). Under other deformation conditions, the stress-strain curves exhibit the typical DRX characteristics. On the whole, the stress decreases with the increase of deformation temperature and decrease of the strain rate. The initial dendritic structure gradually disappears and more dynamic recrystallized grains form with the decrease of strain rate and the increase of the deformation temperature. The nucleation mechanism of discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) occurred simultaneously for the MoNbHfZrTi alloy during hot deformation. The effect of CDRX was weakened with the increase of deformation temperature and with the decrease of strain rate. (c) 2015 Elsevier B.V. All rights reserved.
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