一种含少量Zn、Mn的Al-Cu-Li-Mg-Zr合金的力学性能及微观组织  

Mechanical Properties and Microstructure of an Al-Cu-Li-Mg-Zr Alloy Containing Small Zn and Mn

作　　者：陈文敬[1] 任文达[1] 陈永来[2] 李劲风[1] 郑子樵[1] 赵旭山[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]航天材料及工艺研究所,北京100076

出　　处：《中国材料科技与设备》2007年第1期106-109,共4页Chinese Materials Science Technology & Equipment

基　　金：国家十五重点攻关项目（MKPT-01-130（2D））

摘　　要：设计了一种含少量Zn、Mn的Al-Cu-Li-Mg-Zr合金，并研究了其拉伸性能及微观组织。结果表明：该合金的主要析出相为6（Al5Cu6Mg2）相、T1（A12CuLi）相及θ′（A12Cu）相。160℃／18h时效时，随固溶温度升高，θ′相减少，6相和T1相含量增加，合金强度提高。530℃／1h固溶后，随时效温度升至175℃时，6相及T1相增加，合金强度增大；时效温度进一步升高至190℃，T1相减少，合金强度降低，且随时效温度升高，合金塑性降低，其断裂方式由韧性断裂逐渐转变为复合断裂。An Al - Cu - Li - Mg - Zr alloy containing small Zn and Mn was designed and its mechanical properties and microstructures were studied. It is found that the main precipitates of the alloy are 6 （Al5Cu6 Mg2）, T1 （Al2CuLi） and θ′ （Al2Cu）. As the alloy is aged at 160℃ for 18h, θ′ is decreased , and the amount of T1 and θ′is gone up with the temperature for solution treatment, resulting in a raise of strength. After solution treatment at 530℃ for lh, as the aging temperature is elevated to 175℃ , the amount of T1 and θ′is raised, leading to the increase of strength. While, as the aging temperature is further up to 190℃, the strength of the alloy is decreased due to the small amount of T1 precipitate . Meanwhile, the elongation of the alloy is fallen and the fracture form is changed from toughness fracture to combined rupture with aging temperature climbing up.

关 键 词：铝锂合金 力学性能 微观组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]