摘要
采用洛氏硬度计(HRB)、透射电镜(TEM)、高分辨透射电镜(HRTEM)以及电子拉伸试验机等技术,对7003铝合金的时效行为、力学性能、显微组织、抗应力腐蚀性能等进行了系统的研究。结果表明,7003铝合金时效后的硬度、强度都出现时效双峰的现象,合金两个时效峰的硬度和强度差不多;但在393 K的长期时效制度下,时效第二峰时合金的强度、硬度、塑性、韧性、抗应力腐蚀性能都较第一时效峰的高;对应第一个峰值,合金的主要强化相是GP区;对应第二峰值,其主要强化相为η′(MgZn2)相。这两种相都能阻碍位错运动,对合金起到很好的强化作用。
The aging behavior,mechanical properties,microstructure and the stress corrosion resistance of 7003 aluminum alloy have been studied by means of Rockwell hardness tester（HRB）,transmission electron microscope（TEM）,high resolution transmission electron microscope（HRTEM） and electronic tensile strength stretcher.The results show that there are both hardness and strength double peaks appeared in the aged 7003 aluminum alloy.But there is not much different between the first peak and the second peak values.However,after long-term aging at 393 K,the strength,hardness,plasticity,toughness and the stress corrosion resistance of the second peak are higher than that of the first peak;the strengthening phase of the second peak is GP phase and the strengthening phase of the first peak isη＇（MgZn2） phase.All these two phases can impede the dislocation movement.So the played a very important role of strengthening the alloy.
出处
《轻合金加工技术》
CAS
北大核心
2011年第1期52-57,共6页
Light Alloy Fabrication Technology
基金
国家自然科学资助基金项目(50771093)
关键词
7003铝合金
时效双峰
析出相
7003 aluminum alloy
double-peaking aging
precipitated phase
