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采用硬度、电导率测试和显微组织观察等手段,研究了二级时效温度对2099铝锂合金硬度、电导率、抗晶间腐蚀和抗剥落腐蚀性能的影响。结果表明:经过121℃×14 h一级时效和不同温度(151、161、171、181、191和201℃)下的48 h二级时效热处理后,硬度值先随二级时效温度的升高而显著增加,在181℃时达到峰值,然后在191℃时开始出现下降趋势,201℃时大幅下降;电导率随二级时效温度变化较小;在二级时效温度为181℃,即峰值硬度时的抗晶间腐蚀性能最差;二级时效温度对抗剥落腐蚀性能影响不大。
The effects of second-stage aging temperature on the hardness, electrical conductivity, intergranular corrosion resistance and anti-spalling corrosion resistance of 2099 Al-Li alloy were investigated by means of hardness, conductivity test and microstructure observation. The results show that after 48 h secondary aging heat treatment at 121 ℃ × 14 h and at different temperatures (151, 161, 171, 181, 191 and 201 ℃), the hardness value first increases with the second aging temperature , And then increased sharply at 181 ℃, then began to decline at 191 ℃, and then decreased sharply at 201 ℃. The conductivity changed little with the second-stage aging temperature. When the second-stage aging temperature was 181 ℃, the peak hardness When the intergranular corrosion resistance of the worst; second aging temperature spalling corrosion resistance has little effect.