Effect of solution time on microstructure and mechanical properties of 2219 aluminum alloy

doi:10.13251/j.issn.0254-6051.2023.07.026

Abstract

Abstract: Effect of solution time on microstructure and mechanical properties of 2219 aluminum alloy was studied by means of mechanical properties testing, scanning electron microscope (SEM), differential scanning calorimetry (DSC) and XRD analysis. The results show that, when the solution time is less than 1.5 h at 535 ℃, the primary phases dissolve in matrix and improve the supersaturation of the matrix with the solution time increasing, which is conducive to the improvement of mechanical properties of the alloy. When the solution time exceeds 2 h, the Cu-rich phases undergo segregation and grow up, resulting in the decrease of mechanical properties, especially elongation of the alloy. Therefore, the suitable solution treatment time of the alloy is 1.5 h at 535 ℃. After peak aging at 175 ℃ for 18 h, the ultimate tensile strength, yield strength and elongation of the aluminum alloy are 393.5 MPa、305.9 MPa and 8.7%, respectively.

Key words: 2219 aluminum alloy, solution time, mechanical properties, microstructure

CLC Number:

TG146

Wang Huimin, Li Yanguang, Wu Jingyi. Effect of solution time on microstructure and mechanical properties of 2219 aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(7): 152-156.

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