张力文,边天军,龚小涛,崔英帼

• 1:西安航空职业技术学院航空制造工程中心

摘要(Abstract)：

采用蠕变时效实验和透射电镜(TEM)分析研究了时效温度(150～190℃)、加载应力(200～300 MPa)和冷却方式(空冷、炉冷)等工艺参数对2195铝锂合金蠕变变形和力学性能的影响，并分析了合金力学性能的强化机理。结果表明：合金的蠕变应变随时效温度和加载应力的增大而增大，蠕变速率在升温阶段随温度的升高而增大，在保温阶段逐渐减小，并进入稳态蠕变阶段，蠕变速率降到一定值后基本保持不变；且加载应力越大，蠕变增加越剧烈，合金对蠕变敏感度增大；合金强度随时效温度和加载应力的增加而增大，而伸长率呈相反趋势；随炉冷却方式下，合金的强度和伸长率略大于空冷；在180℃和250 MPa条件下时效8 h后合金具有较强力学性能的原因是合金内部析出了大量阻碍变形过程中位错运动的T_1强化相和少量θ′相。

关键词(KeyWords)： 铝锂合金;蠕变;时效

Abstract:

Keywords:

基金项目(Foundation): 西安航空职业技术学院2024年度校级重点项目(24XHZD-02);; 陕西高校青年创新团队“航空关键结构件精确控形控性技术应用创新团队”

作者(Author): 张力文,边天军,龚小涛,崔英帼

DOI: 10.13289/j.issn.1009-6264.2024-0585

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