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采用透射电镜,拉伸性能测试和慢应变拉伸等手段研究时效制度对2099铝锂合金微观组织和力学及应力腐蚀性能的影响。研究采用1组T6(175℃/48 h)制度和2组T8制度对试样进行处理。实验发现,T8状态下试样的抗拉强度均高于T6态。同时T8态中双级时效制度(2.5%预变形,120℃/12 h+150℃/48 h)相比于单级时效制度(2.5%预变形,150℃/48 h)具有更优异的综合性能。对2099合金进行应力腐蚀测试,试样并未发生强度损失现象,然而失效却加速。合金经过T8双级时效后,抗拉强度、屈服强度和延伸率分别为590 MPa、570 MPa,9.3%。
The effects of aging system on the microstructure and mechanical properties and stress corrosion resistance of 2099 Al-Li alloy were investigated by transmission electron microscopy, tensile testing and slow strain drawing. One T6 (175 ℃ / 48 h) system and two T8 systems were used to treat the samples. The experimental results show that the T8 tensile strength of the samples are higher than the T6 state. At the same time, the dual-stage aging system (2.5% pre-deformation, 120 ° C / 12 h + 150 ° C / 48 h) in the T8 state has a more excellent combination than the single-stage aging system performance. Stress-corrosion tests on 2099 alloy did not cause any loss of strength, however, failure accelerated. T8 alloy after two-stage aging, the tensile strength, yield strength and elongation were 590 MPa, 570 MPa, 9.3%.