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<p>The 2A97 Al-Li alloy has been used in some key structural parts of aircraft to achieve lightweight. However, coordinating control of the forming performance and the forming accuracy is difficult. The above problems can be solved by the hot forming with synchronous quenching (HFSQ) process. The HFSQ process is simultaneously carried out hot forming and quenching in the mold; then, the forming part is pressed for some time. And the forming accuracy of the HFSQ part is predicted through the finite element simulation. The accuracies of formed parts of the cold forming, the new quenching forming, and the HFSQ are compared. Through the comparison of the finite element simulation and the test results, it is proved that the HFSQ process is the best. The flatness of the formed part is 0.1248, the maximum size deviation between the long and the short bend distances is 0.14&#xa0;mm, and the angling error is within the range of ± 0.7°. The tensile strength and the yield strength of the undeformed and deformed portions of the HFSQ parts are higher than those of the original alloy. The microstructures and the precipitates of the HFSQ part are characterized. The average diameter of the microstructure of the original alloy is 28.54&#xa0;μm. The average diameters of the undeformed and deformed parts of the HFSQ parts are 22.59&#xa0;μm and 24.86&#xa0;μm, respectively. And the grain sizes are refined. The phases of the T<sub>1</sub> and the δ' are mainly strengthening phases in the undeformed zone. And the T<sub>1</sub> phases are fine needle-like in the deformation zone. The forming quality and the accuracy of the 2A97 Al-Li alloy are significantly improved by the HFSQ process. Therefore, coordinating control of the forming precision and the performance of the 2A97 Al-Li alloy has been achieved through the HFSQ process.</p>

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Effect of the Hot Forming with the Synchronous Quenching Process on Forming Accuracy and Microstructure of the 2A97 Al-Li Alloy

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Peng Zhang,
  • Anqiang Zhu,
  • Yuchuan Lei,
  • Zhiteng Zhang,
  • Qingpeng Ding,
  • Huiting Wang,
  • Benqi Jiao

摘要

The 2A97 Al-Li alloy has been used in some key structural parts of aircraft to achieve lightweight. However, coordinating control of the forming performance and the forming accuracy is difficult. The above problems can be solved by the hot forming with synchronous quenching (HFSQ) process. The HFSQ process is simultaneously carried out hot forming and quenching in the mold; then, the forming part is pressed for some time. And the forming accuracy of the HFSQ part is predicted through the finite element simulation. The accuracies of formed parts of the cold forming, the new quenching forming, and the HFSQ are compared. Through the comparison of the finite element simulation and the test results, it is proved that the HFSQ process is the best. The flatness of the formed part is 0.1248, the maximum size deviation between the long and the short bend distances is 0.14 mm, and the angling error is within the range of ± 0.7°. The tensile strength and the yield strength of the undeformed and deformed portions of the HFSQ parts are higher than those of the original alloy. The microstructures and the precipitates of the HFSQ part are characterized. The average diameter of the microstructure of the original alloy is 28.54 μm. The average diameters of the undeformed and deformed parts of the HFSQ parts are 22.59 μm and 24.86 μm, respectively. And the grain sizes are refined. The phases of the T1 and the δ' are mainly strengthening phases in the undeformed zone. And the T1 phases are fine needle-like in the deformation zone. The forming quality and the accuracy of the 2A97 Al-Li alloy are significantly improved by the HFSQ process. Therefore, coordinating control of the forming precision and the performance of the 2A97 Al-Li alloy has been achieved through the HFSQ process.