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Open AccessArticle

Effects of Deformation Parameters on Microstructural Evolution of 2219 Aluminum Alloy during Intermediate Thermo-Mechanical Treatment Process

by Lei Liu 1, Yunxin Wu 2,* and Hai Gong 2
1
Light Alloy Research Institute, Central South University, Changsha 410083, China
2
State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1496; https://doi.org/10.3390/ma11091496
Received: 30 July 2018 / Revised: 14 August 2018 / Accepted: 15 August 2018 / Published: 22 August 2018
(This article belongs to the Special Issue Additive Manufacturing: Alloy Design and Process Innovations)
To explore the effective way of grain refinement for 2219 aluminum alloy, the approach of ‘thermal compression tests + solid solution treatment experiments’ was applied to simulate the process of intermediate thermo-mechanical treatment. The effects of deformation parameters (i.e., temperature, strain, and strain rate) on microstructural evolution were also studied. The results show that the main softening mechanism of 2219 aluminum alloy during warm deformation process is dynamic recovery, during which the distribution of CuAl2 phase changes and the substructure content increases. Moreover, the storage energy is found to be decreased with the increase in temperature and/or the decrease in strain rate. In addition, complete static recrystallization occurs and substructures almost disappear during the solid solution treatment process. The average grain size obtained decreases with the decrease in deforming temperature, the increase in strain rate, and/or the increase in strain. The grain refinement mechanism is related to the amount of storage energy and the distribution of precipitated particles in the whole process of intermediate thermal-mechanical treatment. The previously existing dispersed fine precipitates are all redissolved into the matrix, however, the remaining precipitates exist mainly by the form of polymerization. View Full-Text
Keywords: 2219 aluminum alloy; intermediate thermo-mechanical treatment; storage energy; CuAl2 phase; grain refinement 2219 aluminum alloy; intermediate thermo-mechanical treatment; storage energy; CuAl2 phase; grain refinement
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Liu, L.; Wu, Y.; Gong, H. Effects of Deformation Parameters on Microstructural Evolution of 2219 Aluminum Alloy during Intermediate Thermo-Mechanical Treatment Process. Materials 2018, 11, 1496.

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