The recently developed retrogression and reaging (RRA) heat treatments have been applied to redress the trade-off between strength and corrosion resistance in 7000 series aluminum alloys. So far they have been applied to thin and small sample sizes with some success. In this study a modified RRA treated material was found to show significant improvement in both the exfoliation and stress corrosion cracking (SCC) resistances, with only a minimal loss in yield strength compared to its T6 temper. Comparative SEM and TEM analyses of their fracture mode were made. A model has been proposed to explain the differences in their microstructures and marked differences in SCC susceptibilities.

Subject
Crack growth, Corrosion failures, Materials, Microstructure, Precipitates, Dissolution, Corrosion cracking, Stress cracking, Grain boundary, Heat treatment, Stress corrosion cracking, Conductivity, Hydrogen
© 1986 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1986
Association for Materials Protection and Performance (AMPP)
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