淬火介质及微量Ag对Al-Zn-Mg-Cu合金组织性能的影响  

Effect of quenching medium and small addition of Ag on microstructure and properties of Al-Zn-Mg-Cu alloy

作　　者：吕青[1] 刘志义[1] 段水亮[1] 李尧[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《材料热处理学报》2009年第5期92-95,共4页Transactions of Materials and Heat Treatment

基　　金：国家"973"重点基础研究发展项目(2005CB623705-04)

摘　　要：通过常温力学性能测试和透射电镜对含微量Ag的Al-Zn-Mg-Cu合金的组织性能进行了研究。结果表明,相对于20℃水淬,在空气淬火条件下由于淬火速率的降低,不含银合金和含银合金试样的抗拉强度降幅分别为20.8%和14.4%。透射电镜观察表明,空气淬火条件下,合金在淬火过程中析出的晶内粗大η相是导致合金力学性能下降的主要原因。研究表明,Ag与空位较高的结合能抑制了淬火过程中原子的扩散及晶内粗大η相的形成,减小了合金因淬火速率下降而造成的强度损失。The mechanical properties and microstructure of Al-Zn-Mg-Cu alloy with and without addition of Ag were investigated by means of tensile test and transmission electron microscopy. The results show that tensile strength of the silver-free alloy and the silver-containing alloy quenched in water decreases by 20.8 % and 14.4% , respectively, compared with that of the alloys quenched in air. TEM results indicate that coarse η phase formed in grains during air-quenching is responsible for the reduction of tensile strength of the test alloy. It is suggested that Ag retards atom diffusion and formation of coarse η particals, and therefore addition of Ag reduces the loss of strength of the test alloy.

关 键 词：AL-ZN-MG-CU合金 淬火介质 淬火速率 AG 

分 类 号：TG146.2[一般工业技术—材料科学与工程]