Effect of Zinc Content on the Ageing behavior of Al-Zn-Mg-Cu-Li alloys
In this paper, Al-5.6Zn-2.8Mg-1.6Cu-0.24Cr-1.1Li, Al-8.0Zn-2.4Mg-2.4Cu-1.1Li-0.18Zr and Al-11.8Zn-2.9Mg-2.8Cu-1.1Li-0.24Zr (in wt％) alloys were artificially aged at 80,100,120,140 and 160℃ for different time, respectively. The ageing process, microstructure and hardness of different alloys are investigated by Vickers hardness and transmission electron microscopy (TEM). With the increment of zinc content, addition of Li to Al-Zn-Mg-Cu alloy containing high alloying elements has little effect on the nucleation of precipitates, but the growth of precipitates has been inhibited. Very fine precipitates with high density are formed during ageing due to the existence of high alloying elements, which result in highly strengthening alloy. As the alloying content is too high to exceed the solution saturation of matrix, coarse second phases are formed in grain boundary.
zinc content Al-Zn-Mg-Cu-Li Alloys ageing processes hardness precipitation
ZHAO Zhongkui SUN Qingzhou ZHANG Puqing WANG Xuejiu CHEN Changqi
Materials Science and Engineering School, Shandong Jianzhu University, Jinan 250101 P.R.China Logistics department, Shandong Jianzhu University, Jinan 250101 P.R.China Material Science and Engineering school, Beijing University of Aeronautics and Astronautics, Beijing
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）