Simulation of low proportion of dynamic recrystallization in 7055 aluminum alloy
(1. International Joint Laboratory for Light Alloys (Ministry of Education), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. Alnan Aluminium Co., Ltd., Nanning 530031, China;
3. Shenyang National Laboratory for Materials Science, Chongqing University, Chongqing 400044, China)
2. Alnan Aluminium Co., Ltd., Nanning 530031, China;
3. Shenyang National Laboratory for Materials Science, Chongqing University, Chongqing 400044, China)
Abstract: The hot deformation and dynamic recrystallization (DRX) behaviors of 7055 aluminum alloy were studied at temperatures of 390-470 °C and strain rates of 0.01-1 s-1. A low DRX fraction between 1% and 13% was observed by using EBSD technique. A modified JMAK-type DRX model was proposed for such low DRX fraction problems. The model was used together with commercial FEM software DEFORM-3D to simulate the hot compression of 7055 aluminum alloy. There was a good agreement between experimental and predicted DRX fractions and grain size with an average absolute relative error (AARE) of 13.7% and 6.3%, respectively. In order to further verify the validity of the proposed model, the model was also used to simulate DRX in industrial hot rolling of 7055 aluminum alloys. The results showed that the distribution of DRX fraction was inhomogeneous, and agreed with experimental observations.
Key words: dynamic recrystallization; JMAK model; DEFORM-3D; 7055 aluminum alloy; hot compression