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Grain Refinement and Thermal Stability of 2219 Aluminum Alloy in the Warm Deformation Process
Xianchang Mao,Youping Yi,Shiquan Huang,Wanfu Guo,Hailin He 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
2219 Al alloy is an important material for manufacturing launch vehicles, and its grain structure has a substantial effecton the performance of storage tank transition rings. In this work, warm compression tests (100–350 °C) of 2219 Al alloywere carried out, a grain refinement model of warm deformation was established, and the evolution and thermal stability ofthe static recrystallized grain size D were analyzed. The results showed that static recrystallization is the main mechanismof grain refinement, and that the nucleation rate and grain refining effects were significantly improved by decreasing thedeformation temperatures (T). The established model was found to be accurate, and the predicted and experimental valuesexhibited high degrees of coincidence. When T and the amount of deformation (Δd) were respectively 150 °C and 70%, thevalue of D was reduced from 60 μm to 21 μm. Additionally, when the solution treatment time was increased from 0 to 4 h,there was a slight change in the values of D (high thermal stability) when T was lower than 250 °C and Δd was greater than20%, but they significantly increased when Δd was less than 10%.
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