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63Cu NMR investigation of effect of small additions of Sn to Al-1.7 at.%Cu in promoting accelerated phase transformations on aging
journal contribution
posted on 2005-08-01, 00:00 authored by T Bastow, L Bourgeois, Maria ForsythMaria ForsythVery recently 63Cu NMR has been shown to be extremely sensitive in detecting and differentiating between the precipitate phases that form in Al-Cu alloys during heat treatment. This technique is now used to quantify the effectiveness of small additions of Sn to the alloy Al-1.7 at.% Cu in promoting the rapid nucleation and growth of the θ'-phase precipitate. Two parallel series of 63Cu NMR spectra were recorded for Al-1.7 at.% Cu and Al-1.7 at.% Cu-0.01 at.% Sn: (i) aged at 130° C to observe the comparative rate of phase evolution and (ii) aged at 200° C to observe the rate of growth of θ'-phase and to compare with the Vickers hardness of the alloys aged at 200° C for similar periods. Evidence is presented that a metastable precursor phase to θ' (labelled TPHM2757math001) is formed in Al-Cu-Sn which transforms to θ' on further aging.
History
Journal
Philosophical magazineVolume
85Issue
24Pagination
2757 - 2766Publisher
Taylor & Francis Ltd.Location
London, EnglandPublisher DOI
ISSN
1478-6443eISSN
1478-6435Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2005, Taylor & FrancisUsage metrics
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