中文摘要：

用显微硬度计、电子拉伸试验机、扫描电子显微镜（SEM）、能谱（EDS）等手段,对不同时间固溶处理的7003铝合金时效前后的显微组织与性能进行了研究。结果表明,随着固溶时间的延长,第二相先溶解后又有新的析出并长大,第二相的强化效果先是降低后又增强,从而其强度和硬度先降低后增强;时效后的强度和硬度明显高于时效前,且743K×70min固溶的合金经过393K×50h时效后,其硬度、抗拉强度、屈服强度和伸长率分别达到118HV0.1、347.0MPa、286.1MPa和15.5%。

英文摘要：

The microstructure and properties of 7003 aluminum alloy with and without ageing for different solid solution time were investigated respectively by means of microhardness tester, electronic tensile machine,optieal microscope（ OM ）, scanning electron microscopy（ SEM ）and energy dispersive X-ray spectrometer（EDS）. The results show that the solid solubility of the second-phase increases with increase of solid solution time, and then new second-phases separate out and grow, hence the strengthening of the second phases decreases firstly and then increases. Therefore, the strength and microhardness of 7003 aluminum alloy decrease firstly and then increase. The strength and microhardness of the aged 7003 aluminum alloy are evidently higher than those of the one without ageing,and the samples solutioned at 743 K for 70 rain and then aged at 393 K for 50 h are of the highest strength and microhardness. Its microhardness,tensile strength ,yield strength and elongation are 118 HVO. 1,347. 0 MPa,286. 1 MPa,15.5% ,respectively.