Journal
MATERIALS CHARACTERIZATION
Volume 178, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2021.111203
Keywords
Spray forming; 7055 aluminum alloy; Adiabatic heating; Misorientation; EBSD
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Funding
- China Postdoctoral Science Foundation [2019M661738]
- Natural Science Research of Jiangsu Higher Education Institutions of China [19KJB430001]
- National Natural Science Foundation of China [51971206]
- Jiangsu Provincial Key Research and Development Program [BE2017127]
- Defense Industrial Technology Development Program [JCKY2017205B032]
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In this study, the hot workability of a spray formed 7055 aluminum alloy was investigated using advanced Gleeble thermo-mechanical simulation technology and EBSD technology. It was found that with increasing deformation parameters, the grains become finer and the distribution of crystal orientation becomes more homogeneous. Additionally, both Continuous Dynamic Recrystallization (CDRX) and Discontinuous Dynamic Recrystallization (DDRX) mechanisms coexist during hot deformation.
In this work, the hot workability of a spray formed 7055 aluminum alloy was successfully investigated through advanced Gleeble thermo-mechanical simulation technology, and the EBSD technology was adopted to analyze the evolution of deformation microstructure comprehensively. From the results, the occurrence of the adiabatic heating phenomenon is confirmed, and an abnormal stress drop caused by which is then corrected by the extrapolation method. Moreover, it is noteworthy that with rising deformation parameters (including deformation temperature T from 350 degrees C to 450 degrees C, strain rate epsilon from 1 s-1 to 20 s-1 and true strain epsilon from 0.1 to 0.8), the grains become finer, and the distributions of crystal orientation tend to be more homogeneous. Besides, it is found that both the Continuous Dynamic Recrystallization (CDRX) and Discontinuous Dynamic Recrystallization (DDRX) mechanisms coexist during hot deformation. Moreover, the increase of the three deformation parameters enlarges the misorientation angle inside the grains, which facilitates the DRX progress.
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