时效时间对2198铝锂合金组织和力学性能的影响  

Effect of Aging Time on Microstructure and Mechanical Properties of 2198 Al-Li Alloy

作　　者：王浩军[1] 史春玲[1] 杨文华[2] 张超[2] 曾卫东[2] 

机构地区：[1]中航工业西安飞机工业集团有限责任公司,陕西西安710089 [2]西北工业大学凝固技术国家重点实验室,陕西西安720072

出　　处：《热加工工艺》2013年第8期187-189,共3页Hot Working Technology

摘　　要：通过力学性能试验、金相显微镜和扫描电镜等分析了时效时间对2198铝锂合金组织和力学性能的影响。结果表明:在相同时效温度条件下,随时效时间的延长,2198铝锂合金的拉拉强度、屈服强度和硬度不断提高,而伸长率略有下降。随时效时间的延长,断口表面的韧窝不断减少,逐渐从韧窝断裂演变成为片层状的准解理断裂。The effects of aging time on the microstmcture and tensile properties of 2198 Al-Li alloy were investigated by tensile test, optical microscope and scanning electron microscope. The results show that the tensile strength increases with aging time increasing, while the tensile elongation decreases slightly. The dimples on the fracture surface decreases continuously with aging time increasing, and the fracture mechanism changes from dimple fracture into laminated quasi-cleavage fracture.

关 键 词：2198铝锂合金 时效处理 组织 性能 

分 类 号：TG156.92[金属学及工艺—热处理]