Journal
MATERIALS & DESIGN
Volume 122, Issue -, Pages 11-20Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2017.02.088
Keywords
TiAl-based alloy; Dynamic recrystallization; Nucleation mechanism; Numerical model
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Funding
- National Natural Science Foundation of China [51405110]
- China Postdoctoral Science Foundation [2014 M551234]
- Specialized Research Fund for the Doctoral Program of Higher Education [20132302120002]
- Fundamental Research Funds for the Central Universities [HIT. NSRIF. 2014006]
- Heilongjiang Province Postdoctoral Fund [LBH-Z14096]
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An Avrami-type equation was used to investigate the dynamic recrystallization (DRX) behavior of a TiAl-based alloy during hot compression tests. The effects of hot deformation parameters on DRX behavior of samples were determined based on the established dynamic recrystallization kinetics model. The nucleation mechanism of dynamic recrystallization and the microstructure evolution of the deformed samples were studied using electron backscatter diffraction (EBSD). Discontinuous dynamic recrystallization (DDRX) is subsequently identified by obvious nucleation and grain growth. It was indicated that the DRX volume fraction and grain size decrease with the decrease of deformation temperature or the increase of strain rate. The TEM images show that the deformation twinning of gamma-phase is formed during hot deformation which can provide more nucleation sites for DDRX and promote the occurrence of DRX significantly. Furthermore, the determined kinetics model was programmed into finite element codes to investigate the DRX behavior of the TiAl-based alloy during hot deformation. The equivalent strain distribution and DRX volume fraction evolution calculated by simulated approach can well demonstrate the experiment results.(C) 2017 Elsevier Ltd. All rights reserved.
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