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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 microstructure and properties of Al-Zn-Mg-Cu alloys containing trace amounts of Ag were studied by means of normal temperature mechanical tests and transmission electron microscopy. The results show that the tensile strength of non-silver alloy and silver-containing alloy specimens decreases by 20.8% and 14.4%, respectively, due to the decrease of quenching rate under air quenching compared with that of water quenching at 20 ℃. Transmission electron microscopy showed that under air quenching conditions, the precipitated intragranular coarse η phase during the quenching of the alloy was the main reason for the decrease of the mechanical properties of the alloy. The results show that the combination of Ag and vacancies can inhibit the atom diffusion and the formation of coarse η phase in the quenching process and reduce the strength loss caused by the quenching rate of the alloy.