Effect of precipitation on the warm deformation behavior of AA2024 alloy

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• 作者：G.R. Ebrahimi^a ; ^{r_ebrahimi2000@yahoo.com} ; H.R. Ezatpour^b ; ^{H.R.Ezatpour@gmail.com}
• 关键词：Aluminum alloy ; Warm deformation ; Dynamic precipitation ; Mechanical and microstructure results
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：10 January 2017
• 年：2017
• 卷：681
• 期：Complete
• 页码：10-17
• 全文大小：2186 K
• 卷排序：681

文摘

The warm deformation behavior of precipitation hardening alloys depends on the changes in precipitate morphology. In this research, the kinetics of dynamic precipitation of AA2024 were investigated and compared to static precipitation at temperatures of 200 °C, 230 °C, and 260 °C. Results show that deformation increased the precipitation kinetics rate than that of the static precipitation. Also, the rate of increase in electrical conductivity and hardness of dynamic aging was more than static aging. The dynamic precipitation process considerably increased flow stress value during hot deformation in the supersaturated specimens. The most effective strain-precipitation-hardening was found in the temperature range of 200–230 °C. This effect was dependent on the strain rate while the diffusion mechanism controlled the precipitation process.