The effect of pre-ageing temperature and retrogression heating rate on the strength and corrosion behaviour of AA7150

Daokui Xu, Nick Birbilis, Paul Rometsch

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Abstract

The effects of processing condition variations in the retrogression and re-ageing (RRA) treatment of AA7150 have been investigated. The results reveal that the corrosion resistance and strength of RRA-treated samples are sensitive to the pre-ageing temperature and retrogression heating rate. With an intermediate pre-ageing temperature of 60 °C and a slow retrogression heating rate of 5 °C/min, RRA-treated samples can be tailored towards a good combination of both corrosion resistance and strength, owing to a smaller potential difference between grain-boundary precipitates and the matrix, and a larger volume fraction of strengthening precipitates in the matrix.
Original languageEnglish
Pages (from-to)17 - 25
Number of pages9
JournalCorrosion Science
Volume54
DOIs
Publication statusPublished - 2012

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