Microstructure evolution and mechanical properties of laser melting deposited 2195 aluminum-lithium alloy

doi:10.13251/j.issn.0254-6051.2023.01.010

Abstract

Abstract: 2195 aluminum-lithium alloy was prepared by laser melting deposition (LMD) technology. The optimal process parameters of laser melting deposited 2195 Al-Li alloy were analyzed by single-channel and overlap-track experiments, and the microstructure of the alloy was systematically studied by optical microscope (OM) and other characterization methods. The results show that the optimum deposition process parameters are scanning power of 1400 W, scanning rate of 480 mm/min and scanning spacing of 1.6 mm, and precipitated Al₇Cu₄Li (TB) phase is found to distribute along grain boundary in the alloy 5-layer stacked blocks printed by the optimal process parameters, and then the precipitated phase gradually dissolves into the matrix after solution treatment at 450 ℃ for 2 h. After aging at 155 ℃ for 32 h and water cooling, stable second phase precipitates from unstable supraturated solid solution Al₇Cu₄Li and forming stable aging structure, so that the hardness of the aged specimen is significantly higher than that of the specimen solution treated.

Key words: additive manufacturing, aluminum-lithium alloy, laser melting deposition, process parameter, microstructure

CLC Number:

TG146.21

Gu Hai, Zhang Jie, Sun Jianhua, Wu Guoqing, Sun Zhonggang. Microstructure evolution and mechanical properties of laser melting deposited 2195 aluminum-lithium alloy[J]. Heat Treatment of Metals, 2023, 48(1): 52-59.

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