应力作用下2124合金蠕变时效的组织与性能  

Microstructures and properties of 2124 alloy creep ageing under stress

作　　者：湛利华[1] 李炎光[1] 黄明辉[1] 

机构地区：[1]中南大学机电工程学院,高性能复杂制造重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2012年第3期926-931,共6页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展规划(“973”计划)项目(2010CB731700)

摘　　要：通过硬度测试、拉伸测试和透射电镜分析等方法,研究应力分别为0MPa和200MPa对Al-Cu-Mg系2124合金185℃时效后的硬度、强度以及伸长率的影响,阐述应力对2124合金时效后组织与力学性能的影响。研究结果表明:在常规时效和蠕变时效2种时效状态下,200MPa应力作用下的蠕变时效使2124合金的S′析出相分布变得不均匀,合金的强度提高,而塑性降低;在0MPa应力作用下,合金峰时效状态下的抗拉强度、屈服强度和伸长率分别为411.6MPa,270.8MPa,20.20%;在200MPa应力作用下,合金峰值时效状态下的抗拉强度、屈服强度和伸长率分别为441.1MPa,321.0MPa和16.24%,后者的抗拉强度和屈服强度比前的高,但塑性低。The effects of stress on hardness, strength and plastic of 2124 A1-Cu-Mg aluminum alloy aged at 185℃ were investigated using hardness test, tensile test and transmission electron microscopy （TEM）. In addition, TEM images of aged samples under 0 MPa and 200 MPa elaborated the influence of stress on the microstructure and mechanical properties of 2124 aluminum alloy. The results show that for both the aged conditions, creep age under stress of 200 MPa leads to the uneven distribution of S＇ phase. S＇ phase increases the strength of 2124 alloy, but the uneven distribution decreases the elongation. For the peak aged plates trader 0 MPa and 200 MPa, the tensile strength, yield strength and elongation are 411.6 MPa, 270.8 MPa, 20.20% and 441.1 MPa, 321.0 MPa, 16.24%, respectively. Strength of the latter is higher than the former, while the elongation is lower.

关 键 词：2124铝合金 蠕变时效 力学性能 微观组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]