Effect of Zinc Content on the Ageing Behavior of Al-Zn-Mg-Cu-Li Alloys

Abstract:

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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°C 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.

Info:

Periodical:

Materials Science Forum (Volumes 575-578)

Edited by:

Jitai NIU, Zuyan LIU, Cheng JIN and Guangtao Zhou

Pages:

1093-1096

DOI:

10.4028/www.scientific.net/MSF.575-578.1093

Citation:

Z. K. Zhao et al., "Effect of Zinc Content on the Ageing Behavior of Al-Zn-Mg-Cu-Li Alloys", Materials Science Forum, Vols. 575-578, pp. 1093-1096, 2008

Online since:

April 2008

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$35.00

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