Hot deformation behavior of high Ti 6061 Al alloy
(Key Laboratory of Advanced Forging & Stamping Technology and Science,
Ministry of Education, Yanshan University, Qinhuangdao 066004, China)
Ministry of Education, Yanshan University, Qinhuangdao 066004, China)
Abstract: The hot deformation behavior of a high Ti 6061 aluminum alloy in the temperature range from 350 to 510 °C and strain rate range from 0.001 to 10 s-1 was investigated using stress-strain curve analysis, processing map, transmission electron microscopy and electron backscatter diffraction analysis. The results show that the peak stress decreases with increasing deformation temperatures and decreasing strain rate. The average deformation activation energy is 185 kJ/mol in the parameter range investigated. The flow stress model was constructed. The main softening mechanism is dynamic recovery. The processing map was obtained using dynamic material model, and the suggested processing window is 400-440 °C and 0.001-0.1 s-1.
Key words: 6061 Al alloy; hot deformation; dynamic recovery; hot processing map; dislocation