ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 27    No. 2    February 2017

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Hot deformation behavior of Al-9.0Mg-0.5Mn-0.1Ti alloy based on processing maps
Cai-he FAN1,2, Ying-biao PENG1, Hai-tang YANG1, Wei ZHOU1, Hong-ge YAN2,3
(1. College of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou 412007, China;
2. Hunan Provincial Key Laboratory of Spray Deposition Technology and Application, Hunan University, Changsha 410082, China;
3. College of Materials Science and Engineering, Hunan University, Changsha 410082, China
)
Abstract: Hot deformation behavior of extrusion preform of the spray-formed Al-9.0Mg-0.5Mn-0.1Ti alloy was studied using hot compression tests over deformation temperature range of 300-450 °C and strain rate range of 0.01-10 s1. On the basis of experiments and dynamic material model, 2D processing maps and 3D power dissipation maps were developed for identification of exact instability regions and optimization of hot processing parameters. The experimental results indicated that the efficiency factor of energy dissipate (η) lowered to the minimum value when the deformation conditions located at the strain of 0.4, temperature of 300 °C and strain rate of 1 s-1. The softening mechanism was dynamic recovery, the grain shape was mainly flat, and the portion of high angle grain boundary (>15°) was 34%. While increasing the deformation temperature to 400 °C and decreasing the strain rate to 0.1 s-1, a maximum value of η was obtained. It can be found that the main softening mechanism was dynamic recrystallization, the structures were completely recrystallized, and the portion of high angle grain boundary accounted for 86.5%. According to 2D processing maps and 3D power dissipation maps, the optimum processing conditions for the extrusion preform of the spray-formed Al-9.0Mg-0.5Mn-0.1Ti alloy were in the deformation temperature range of 340-450 °C and the strain rate range of 0.01-0.1 s-1 with the power dissipation efficiency range of 38%-43%.
Key words: spray forming; Al-9.0Mg-0.5Mn-0.1Ti alloy; hot compressing deformation; processing map; dynamic recrystallization
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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