摘要
采用常温拉伸力学性能测试和透射电镜(TEM)观察,研究新型Al-Zn-Mg-Cu铝合金7D04的热稳定性。结果表明:7D04-T7451合金的组织和性能在不高于125℃时可长时间保持稳定;当温度高于150℃时,板材的强度随着稳定化处理时间的延长持续下降;稳定化处理温度越高强度下降的幅度越大。稳定化温度175℃处理500h后,屈服强度和抗拉强度仅为286MPa和385MPa,与未稳定化处理相比分别降低38%和26%。7D04-T7451铝合金在稳定化处理过程中强度下降的内在原因是由于η′和η相的粗化。
Thermal stability of new style Al-Zn-Mg-Cu aluminum alloy 7D04 was investigated by room temperature mechanical tensile test and TEM analysis.The results show that the microstructures and mechanical properties of 7D04-T7451 keep stable for a long time at 125℃ or below.When the thermal exposure temperature is higher than 150℃,the strength decreases with the increasing of thermal exposure time.The higher thermal exposure temperature,the larger strength drops.When the alloy is exposed at 175℃for 500 h,the yield strength and the tensile strength are 286 MPa and 385 MPa,drop38% and 26%respectively.The main mechanism of the strength of 7D04-T7451 aluminum alloy decrease during thermal exposure processing is the coarsening ofη′phase andηphase.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2015年第4期13-18,共6页
Journal of Materials Engineering
关键词
7D04铝合金
热稳定性
微观组织
力学性能
7D04aluminum alloy
thermal stability
microstructure
mechanical property
