Journal
MATERIALS
Volume 11, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/ma11081443
Keywords
2219 aluminum alloy; constitutive model; microstructural evolution; continuous dynamic recrystallization; hot deformation
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Funding
- National Natural Science Foundation of China [51405520, U1637601, 51327902]
- Fundamental Research Funds for the Central Universities of Central South University [502221801]
- Project of State Key Laboratory of High Performance Complex Manufacturing, Central South University [ZZYJKT2017-06]
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The isothermal compression tests of the 2219 Al alloy were conducted at the temperature and the strain rate ranges of 623-773 K and 0.01-10 s(-1), respectively, and the deformed microstructures were observed. The flow curves of the 2219 Al alloy obtained show that flow stress decreases with the increase in temperature and/or the decrease in strain rate. The physically based constitutive model is applied to describe the flow behavior during hot deformation. In this model, Young's modulus and lattice diffusion coefficient are temperature-dependent, and the creep exponent is regarded as a variable. The predicted values calculated by the constitutive model are in good agreement with the experimental results. In addition, it is confirmed that the main softening mechanism of the 2219 Al alloy during hot deformation is dynamic recovery and incomplete continuous dynamic recrystallization (CDRX) by the analysis of electron backscattered diffraction (EBSD) micrographs. Moreover, CDRX can readily occur under the condition of high temperatures, low strain rates, and large strains. Meanwhile, the recrystallization grain size will also be larger.
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