Strength and Toughness of 1.1wt% Li-Containing Al-Zn-Mg-Cu Alloys

Abstract:

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The effect of ageing processes on the toughness and the yield strength of the Li-containing Al-Zn-Mg-Cu alloys (Al-5.6%Zn-1.9%Mg-1.6%Cu-1.1%Li-0.24Cr) was investigated. The microstructure was observed by transmission electron microscopy, tensile test was performed at a rate of 1mm·s-1, fracture toughness was experimentally determined by the impact test, and the fracture modes had been assessed by image analysis of scanning electron microscopy micrographs. The strength of the Li-containing Al-Zn-Mg-Cu alloys treated at 120 °C is not more than 430MPa, which is very lower than that of 7075 alloys. The strength is comparable to that of 7075–T6 alloys after double-ageing or multi-ageing, however its ductility is lower than that of 7075-T6 alloys. The single-aged Li-containing alloys have high toughness. The multi-aged alloys become brittle. The fracture surface for the Li-containing Al-Zn-Mg-Cu alloys is intergranular, since the intergranular precipitation weakness the grain boundaries.

Info:

Periodical:

Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie

Pages:

392-395

DOI:

10.4028/www.scientific.net/KEM.353-358.392

Citation:

Z. K. Zhao et al., "Strength and Toughness of 1.1wt% Li-Containing Al-Zn-Mg-Cu Alloys", Key Engineering Materials, Vols. 353-358, pp. 392-395, 2007

Online since:

September 2007

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Price:

$35.00

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