Hot deformation behavior of AA7085 aluminum alloy during isothermal compression at elevated temperature

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• 作者：Wenyi Liu ; Huan Zhao ; Dan Li ; Zhiqing Zhang ; Guangjie Huang ; Qing Liu
• 关键词：AA7085 aluminum alloy ; Hot deformation ; Constitutive equation ; Softening mechanism ; Dynamic recrystallization
• 刊名：Materials Science and Engineering: A
• 出版年：24 February, 2014
• 年：2014
• 卷：596
• 期：Complete
• 页码：176-182
• 全文大小：2139 K

文摘

The isothermal deformation compression tests of AA7085 aluminum alloy were performed on Gleeble-1500 system in the temperature range from 250 掳C to 450 掳C and at strain rate range from 0.01 s^鈭? to 10 s^鈭?. The microstructure of samples was observed using optical microscopy (OM) and transmission electron microscopy (TEM) techniques. The results show that the peak stress levels decreased with the increase of deformation temperatures or the decrease of strain rate, which can be represented by the Zener-Hollomon parameter in the exponent-type equation with the hot deformation activation energy of 249.11 KJ/mol. Dynamic recrystallization more obviously occurred in the sample with higher Z value than in the sample with lower Z value. Dynamic recrystallization is sensitively dependent on the deformation temperature.