锻压技术

时效和预变形对2195 铝锂合金组织与性能的影响

英文标题：Influence of aging and pre-deformation on microstructure and properties for 2195 Al-Li alloy

作者：张义俊1 姚国林1 郭晓光2 卢志安2

分类号：TG146. 2

出版年,卷(期):页码：2023,48(1):216-221

摘要：

利用透射电镜、拉伸试验等手段, 研究了时效温度、时效时间和预变形量对2195 铝锂合金显微组织和力学性能的影响, 优化了铝锂合金的时效处理工艺。结果表明: T6 态和T8 态铝锂合金的硬度均会随着时效时间的延长先增加后减小, 经过预变形处理后铝锂合金的峰值硬度对应的时效时间缩短; 随着时效时间的延长, T6 态和T8 态铝锂合金的抗拉强度、屈服强度和断后伸长率的变化趋势相同, 经过预变形处理的T8 态(预变形量5%+175 ℃ /36 h) 铝锂合金的峰值抗拉强度、峰值屈服强度和对应断后伸长率较T6 态(175 ℃ /48h) 铝锂合金分别增加了11. 58%、22. 97%和17. 78%。T6 态和T8 态铝锂合金中均存在颗粒状δ′相、针状θ′相、类球形δ′/ β′复合相和针状T1 相, 且后者的T1 相更加细小、数量更多、分布更加均匀。2195 铝锂合金适宜的时效工艺和预变形量为175 ℃ /36 h+5%。

The influences of aging temperature, aging time and pre-deformation amount on the microstructure and mechanical properties for 2195 Al-Li alloy were studied by transmission electron microscope observation and tensile test, and the aging treatment process of Al-Li alloy was optimized. The results show that with the increasing of aging time, the hardness of Al-Li alloys in T6 and T8 states first increases and then decreases, and the aging time corresponding to the peak hardness of Al-Li alloy is shortened after pre-deformation treatment. With the increasing of aging time, the change trends of tensile strength, yield strength and elongation after fracture of Al-Li alloys in T6 and T8 states are the same, and the peak tensile strength, peak yield strength and corresponding elongation after fracture of Al-Li alloy in T8 state after pre-deformation (pre-deformation amount of 5%+175 ℃ /36 h) are increased by 11. 58%, 22. 97% and 17. 78% respectively compared with Al-Li alloy in T6 states (175 ℃ /48 h). Particle δ′ phase, acicular θ′ phase, quasi spherical δ′/ β′ composite phase and acicular T1 phase are exist in Al-Li alloys in both T6 and T8 states, and T1 phase of the latter is finer, more quantity and more even distribution. The suitable aging process and pre-deformation amount of 2195 Al-Li alloy is 175 ℃ /36 h +5%.

基金项目：

河南省科技攻关项目(192102310244); 机械工程智能化科研创新团队项目(HNACKT-2020-04)

作者简介: 张义俊(1974-), 女, 博士, 副教授 E-mail: yijun7402@ sina. com

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