Effect of single-stage solution temperature on microstructure evolution of spray deposited 2195 Al-Li alloy

doi:10.13251/j.issn.0254-6051.2024.06.010

Abstract

Abstract: Effect of single-stage solution temperature on the second-phase particles, grain size, low-angle grain boundaries, recrystallization fraction and residual stress of spray-deposited 2195 aluminum-lithium alloy was quantitatively analyzed by means of scanning electron microscopy (SEM) and the accompanying electron backscatter diffraction (EBSD) analyzer. The mechanical properties of the alloy were tested using an electronic universal testing machine. The results show that after solution treatment at 510 ℃ for 40 min, the average grain size is increased from 4.57 μm in as-extruded to 13.96 μm, the proportion of low-angle grain boundaries is decreased from 73.1% (as-extruded) to 52.1%, the proportion of second-phase particles is decreased from 9.4% (as-extruded) to 0.73%, and the residual stress is decreased significantly. Meanwhile the recrystallization and subgrain fractions are increased from 31.4% and 22.2% to 41.8% and 53.6% respectively, the proportion of deformed grains is decreased from 46.4% to 4.6%, the hardness reaches 101.5 HV, and the tensile strength reaches 441.6 MPa. With the increase of solution treatment temperature, the microstructure of the alloy changes significantly, and the mechanical properties show a trend of first increasing and then decreasing.

Key words: Al-Li alloy, solution treatment, second phase, recrystallization, low angle grain boundary

CLC Number:

TG156.1

Sun Shuli, Hou Xiaohu, Guo Wenxia, Zhang Jing, Wang Chao, Zhao Xueping, Cao Yu. Effect of single-stage solution temperature on microstructure evolution of spray deposited 2195 Al-Li alloy[J]. Heat Treatment of Metals, 2024, 49(6): 62-68.

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