摘要
本文研究了淬火后预拉伸(O～5%)对7475铝合金T6、T76、T73三种时效状态拉伸性能、导电率及微观组织的影响。研究表明,预拉伸对T6峰值时效强度影响不大,但使T76、T73二种过时效强度下降,同时使三种时效状态的延伸率降低,导电率升高。电镜观察发现,预拉伸后的过时效组织中析出许多形貌成杆状的粗大η相。经电子衍射分析表明,这是一种具有新的取向关系的η相。其取向关系为: (001)η//(111)α (110)η//(112)α
The influence of Pre-stretching (0.25%) after quenching on tensile properties, conductivities and microstructures of 7475 alloy heat-treated with T6,T76 and T73 tempers has been studied. The results showed that Pre-stretching had little effect on the strength obtained by T6 peak-aging, however, significantly reduced the strength of T76 and T73 over-agings, decreased the ductlities of specimens after all three types of treatments and increased conductivities. The examination of TEM microstructures illustrated that many rod-shaped phases appeared in the overaged structure after Pre-stretching. The analysis of the electron diffraction pattern revealed. that η phase exhibits a new orientation relationship with the matrix:(001)η//(111)α, (110)η//(112)α.
出处
《航空材料学报》
EI
CAS
CSCD
1990年第A09期95-101,共7页
Journal of Aeronautical Materials
