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Journal of Materials Engineering and Performance

Published in:

13-10-2015

Effect of Pre-aging on Stress Corrosion Cracking of Spray-formed 7075 Alloy in Retrogression and Re-aging

Authors: Rui-ming Su, Ying-dong Qu, Jun-hua You, Rong- de Li

Published in: Journal of Materials Engineering and Performance | Issue 11/2015

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Abstract

The effects of pre-aging in retrogression and re-aging (RRA) treatment on microstructure, mechanical properties, and stress corrosion cracking (SCC) behavior of spray-formed 7075 aluminum alloy were investigated by tensile test, slow strain rate test, and transmission electron microscope. The results show that the under aging (120 °C for 16 h) as the pre-aging in RRA treatment can vastly improve the mechanical properties and the SCC resistance of the alloy, compared with early aging (120 °C for 8 h), peak aging (120 °C for 24 h), and over aging (120 °C for 32 h) treatments, the ultimate tensile strength of the alloy is 782 MPa, which is higher than that for peak aging or conventional RRA treatment; and the SCC resistance of the alloy is also excellent after RRA with under aging as pre-aging.

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Title: Effect of Pre-aging on Stress Corrosion Cracking of Spray-formed 7075 Alloy in Retrogression and Re-aging
Authors: Rui-ming Su
Ying-dong Qu
Jun-hua You
Rong- de Li
Publication date: 13-10-2015
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 11/2015
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-015-1728-2

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