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<p>In the present study, aiming to optimize process parameters, the influence of pre-strain and deformation on microstructure evolution and mechanical properties have been studied in detail for aluminum alloy material for dampers. The results show that the increased pre-strain promotes the occurrence of recrystallization and the acceleration of precipitation kinetics. The dislocation density increased with the increasing pre-strain, which is responsible for the high fraction η' phase. The specimen in the condition of 5% pre-strain and 5% deformation amount exhibits the high volume fraction fine η' phase, corresponding to the ultimate tensile strength/yield strength values of 580&#xa0;MPa and 532&#xa0;MPa. Large pre-strain leads to the coarsening of the η' phase and the formation of more equilibrium η phase, which reduces the precipitation strengthening effect and results in a decrease in strength. After the calculation of strengthening mechanism, the specimens in 5% pre-strain and 5% deformation amount and the specimen in 0% pre-strain and<?xm-insertion_mark_start author="e414175" time="20260609T100855+0530"?> <?xm-insertion_mark_end??>10% deformation amount are dominated by precipitation strengthening and dislocation strengthening.</p>

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Effects of Pre-strain and Deformation on Microstructure Evolution and Mechanical Properties of Aluminum Alloys for Dampers during Hot Forming Process

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Xuan Luo,
  • Haixing Meng

摘要

In the present study, aiming to optimize process parameters, the influence of pre-strain and deformation on microstructure evolution and mechanical properties have been studied in detail for aluminum alloy material for dampers. The results show that the increased pre-strain promotes the occurrence of recrystallization and the acceleration of precipitation kinetics. The dislocation density increased with the increasing pre-strain, which is responsible for the high fraction η' phase. The specimen in the condition of 5% pre-strain and 5% deformation amount exhibits the high volume fraction fine η' phase, corresponding to the ultimate tensile strength/yield strength values of 580 MPa and 532 MPa. Large pre-strain leads to the coarsening of the η' phase and the formation of more equilibrium η phase, which reduces the precipitation strengthening effect and results in a decrease in strength. After the calculation of strengthening mechanism, the specimens in 5% pre-strain and 5% deformation amount and the specimen in 0% pre-strain and 10% deformation amount are dominated by precipitation strengthening and dislocation strengthening.