Mechanical Property and Intergranular Corrosion Sensitivity of Al-2.7Cu-1.7Li-0.3Mg Alloy with Small Zn Addition

Jin Feng Li; Long Xu; Xi Yao; Zi Qiao Zheng

doi:10.4028/www.scientific.net/MSF.794-796.211

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HomeMaterials Science ForumMaterials Science Forum Vols. 794-796Mechanical Property and Intergranular Corrosion...

Mechanical Property and Intergranular Corrosion Sensitivity of Al-2.7Cu-1.7Li-0.3Mg Alloy with Small Zn Addition

Abstract:

The influence of aging (T6 at 150°C and175°C, T8 at 150°C) and 0.72% Zn addition on the mechanical properties, microstructures and intergranular corrosion (IGC) behavior of Al-2.7Cu-1.7Li-0.3Mg alloys was investigated. With 0.72% Zn addition, the strength of the Al-Li alloy was increased. As the aging time was extended, the corrosion type of the studied Al-Li alloys was changed in the following order: pitting, local IGC, general IGC, local IGC and pitting again. For the T6 temper, as the aging temperature was elevated from 150°C to 175°C, the aging time period for IGC appearance was shortened. The pre-deformation before aging (T8 temper) also greatly shorten the aging time period for IGC. Meanwhile, the addition of 0.72% Zn decreased the IGC sensitivity and shortened the aging time period for IGC.

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Periodical:

Materials Science Forum (Volumes 794-796)

Pages:

211-216

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.794-796.211

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Online since:

June 2014

Authors:

Jin Feng Li*, Long Xu, Xi Yao, Zi Qiao Zheng

Keywords:

Aging Temper, Al-Cu-Li-Mg Alloys, Intergranular Corrosion (IGC), Zn Addition

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