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采用维氏(HV)硬度测试、力学性能测试、透射电镜(TEM)观察等技术手段,研究了双级时效工艺对2099合金组织性能的影响。结果显示,双级时效处理能够显著改善2099合金的综合力学性能指标,合金屈服强度和抗拉强度的增幅分别达144 MPa和98 MPa,而塑性降低0.6%。终时效温度由146℃升高到170℃,达到峰时效态的时间缩短24 h,综合强塑性指标波动较小。时效过程中析出相的演化规律为:预时效态,基体析出相以δ’相为主,T1相较少;峰时效态,以T1相为主,δ’相次之,θ’相很少;过时效态,T1相和δ’相略有粗化,且δ’相数量减少。
The effects of two-stage aging process on the microstructure and properties of 2099 alloy were studied by Vickers (HV) hardness test, mechanical property test and transmission electron microscopy (TEM) observation. The results show that the two-stage aging treatment can significantly improve the mechanical properties of 2099 alloy. The yield strength and tensile strength of the alloys increase by 144 MPa and 98 MPa, respectively, while the ductility decreases by 0.6%. The final aging temperature increased from 146 ℃ to 170 ℃, the time to reach the peak-aging state was shortened by 24 h, and the comprehensive strong plasticity index fluctuated less. The evolution of the precipitated phase during the aging process is: the pre-aging effect, while the matrix precipitates are dominated by the δ ’phase and the T1 phase is less; the peak aging is dominated by the T1 phase, followed by the δ’ phase and the θ ’phase is less In the over-aged condition, the T1 and δ phases are slightly roughened and the δ’-phase decreases.