Transactions of Materials and Heat Treatment

Title：Flow stress behavior and microstructure evolution of Al-Zn-Mg-Cu alloy during hot compression deformation

Authors： WANG Liang LI Hui-qu CHEN Hui-qin LIU Jian-sheng

Unit： Taiyuan University of Science and Technology Beijing Institute of Aeronautical Material

KeyWords： Al-Zn-Mg-Cu alloy hot compression deformation flow stress microstructure

ClassificationCode：TG142.41

year,vol(issue):pagenumber：2010,35(4):133-136

Abstract：

Isothermal compression experiments of Al-Zn-Mg-Cu alloy specimens were carried out on Gleeble-1500 thermal\|mechanical simulator under the conditions of 250-450 ℃ temperature, 0.001-0.1 s^-1 strain rate and 10%-50% deformation. The true stress and true strain curves were obtained, which showed the character of dynamic recovery. The stress exponent and hot deformation activation energy calculated were 4.60 and 186.70 kJ·mol^-1,respectively. Influence of deformation temperature, strain rate and reduction on microstructure evolution were analyzed. And the reasonable process parameters of forging were defined that the temperature interval is 420-450 ℃，strain rate range is 0.01-0.1 ^-1, and the reduction exceeds 30%.

Funds：

国家重点基础研究基金资助项目973（2005CB623705）

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