摘要
通过差热分析、金相组织观察、常温拉伸实验及SEM形貌观察等手段,分析了不同固溶工艺对高Zn的Al-10.4%Zn-2.2%Cu-2.4%Mg-(0.10～0.15)%Zr-0.224%Ag合金的微观组织和力学性能的影响。结果表明,采用接近低熔点共晶熔化温度的强化固溶工艺及单级时效处理后,合金的力学性能明显优于单级固溶和低温强化固溶工艺,其抗拉强度达到770MPa以上,而对应的延伸率保持在8%～10%。与国内开发的其他7000系合金相比,该合金显示出超高强度和良好的塑性,这说明合理的固溶工艺可使高合金化的超高强铝合金的强度和塑性达到良好的配合。但是,SEM观察表明,在合金固溶组织中仍残留部分粗大第二相粒子,这必然对合金的综合性能造成不利影响,因此固溶工艺还有待进一步优化。
Based on differential thermal analysis(DTA),metallurgical structure observation.cold tensile test, optical microscope and scanning electron microscope(SEM) observation, analysis is made of the effect of different solid-solution processes on the microstructure and mechanical properties of high-Zn Al-10.4%Zn-2.2%Cu-2.4%Mg-0.1～0.15Zr-0.224%Ag alloy.The results show that the use of intensified solid solution process at almost low-melting-point eutectic fusion temperature and single-stage ageing can result in remarkably better mechanical property than that by single-stage solid solution and low-temperature intensified solid solution with tensile strength>770Mpa and about 8% to 10% elongation.Compared with other domestic 7000-series alloy,it has super-high strength and good plasticity, indicating that proper solid solution process can result in good coordination of the strength and plasticity in the highly-alloyed super-high-strength Al alloy.However,the SEM observation shows that certain number of coarse second phase particles remained in the solution structure,as will bring about negative impact on the overall properties of the alloy . Thus,further optimization is to be done on the solid solution.
出处
《稀有金属与硬质合金》
CAS
CSCD
2004年第2期11-14,共4页
Rare Metals and Cemented Carbides
基金
国家"863"高技术项目(2001AA332030)
关键词
超高强铝合金
力学性能
均匀化
固溶
Super-high-strength aluminum alloy
mechanical property
homogenization
solid solution
