Microstructure and critical strain of dynamic recrystallization of 6082 aluminum alloy in thermal deformation

2018 5th Global Conference on Polymer and Composite Materials

材料科学;化学

Ren, W.W.^1 ; Xu, C.G.^1 ; Chen, X.L.^1 ; Qin, S.X.^1

Beijing Research Institute of Mechanical and Electrical Technology, Beijing

100083, China^1

关键词: 6082 Aluminium alloys;    Average recrystallized grain size;    Deformation temperatures;    Dislocation densities;    High-temperature compression;    Recrystallized grains;    True stress;    true strain curves;    Volume fraction of recrystallization;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/369/1/012022/pdf
DOI  :  10.1088/1757-899X/369/1/012022

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Using high temperature compression experiments, true stress true strain curve of 6082 aluminium alloy were obtained at the temperature 460°C-560°C and the strain rate 0.01 s-1-10 s-1. The effects of deformation temperature and strain rate on the microstructure are investigated; (-∂lnθ/∂) -curves are plotted based on σ- curve. Critical strains of dynamic recrystallization of 6082 aluminium alloy model were obtained. The results showed lower strain rates were beneficial to increase the volume fraction of recrystallization, the average recrystallized grain size was coarse; High strain rates are beneficial to refine average grain size, the volume fraction of dynamic recrystallized grain is less than that by using low strain rates. High temperature reduced the dislocation density and provided less driving force for recrystallization so that coarse grains remained. Dynamic recrystallization critical strain model and thermal experiment results can effectively predict recrystallization critical point of 6082 aluminium alloy during thermal deformation.