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<p>In this study, the distribution arrangements and the particle strengthening of T<sub>1</sub> precipitates in an Al-Cu-Li alloy after pre-deforming and aging are studied. The alloys were tested microhardness and room temperature tensile strength to study the mechanical properties, combining scanning electron microscopy (SEM), electron backscattering diffraction (EBSD), and transmission electron microscopy (TEM) to characterize the evolution of the microstructure under different pre-deformation amounts. The key enhanced precipitates of the Al-Cu-Li alloy are T<sub>1</sub> precipitates after pre-deformation. The average diameter of T<sub>1</sub> precipitates gradually decreases, and the average thickness of the T<sub>1</sub> precipitates decreases first and then increases with the pre-deformation level. After pre-deformation by 12%, the alloys attain the highest strength, with the yield strength and tensile strength reaching 522&#xa0;MPa and 565&#xa0;MPa, respectively.</p>

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Investigation on Microstructure and Mechanical Properties of Al-Cu-Li Alloys by Pre-deformation and Aging

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Ting Yao,
  • Zhongwei Chen,
  • Zhentong Guo,
  • Haolan Zhang,
  • Zhonghua Guo

摘要

In this study, the distribution arrangements and the particle strengthening of T1 precipitates in an Al-Cu-Li alloy after pre-deforming and aging are studied. The alloys were tested microhardness and room temperature tensile strength to study the mechanical properties, combining scanning electron microscopy (SEM), electron backscattering diffraction (EBSD), and transmission electron microscopy (TEM) to characterize the evolution of the microstructure under different pre-deformation amounts. The key enhanced precipitates of the Al-Cu-Li alloy are T1 precipitates after pre-deformation. The average diameter of T1 precipitates gradually decreases, and the average thickness of the T1 precipitates decreases first and then increases with the pre-deformation level. After pre-deformation by 12%, the alloys attain the highest strength, with the yield strength and tensile strength reaching 522 MPa and 565 MPa, respectively.