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通过显微硬度测试、力学性能测试和透射电镜观察等手段,研究了不同预变形程度对2099合金显微组织和力学性能的影响。结果表明,随着预变形程度增大,合金时效进程显著加快,合金峰时效态的强度显著提高;析出相更为细小弥散地分布于基体中,较为粗大的晶界析出相趋于不连续化、点链化;时效强化相经历了由T_1相、δ′相和θ′相三相共存到以T_1相为主要强化相的变化过程,表明预变形对时效过程中析出相的大小、类型、分布有重要影响,在促进T_1相析出的同时,也消耗了δ′相和θ′相。
The effect of different pre-deformation degree on the microstructure and mechanical properties of 2099 alloy was studied by means of microhardness test, mechanical property test and transmission electron microscope observation. The results show that with the increase of the degree of pre-deformation, the aging process significantly accelerates and the peak strength of the alloy increases significantly. The precipitates are more finely dispersed and dispersed in the matrix. The coarser grain boundaries tend to be discontinuous , And point chain. The aging strengthened phase experienced the process of coexistence of T 1 phase, δ ’phase and θ’ phase to T 1 phase as the main strengthening phase, indicating that the pre-deformation of precipitation phase size, type, Distribution has an important impact, in promoting the T_1 phase precipitation at the same time, also consumed δ ’phase and θ’ phase.