Conventional alclad 7XXX sheet is a laminar composite of a heat treatable Al-Zn-Mg-Cu alloy clad with a low strength Al-1 percent Zn alloy which is anodic to the core. This composite is used on commercial aircraft where the cladding provides electrochemical protection from corrosion. Designers of high performance aircraft, however, often specify bare 7XXX sheet because the weight penalty associated with the lower mechanical properties of alclad sheet is unacceptable. In recent years, heat treatable claddings which provide electrochemical protection have been developed for 7075, and 7008 alclad 7075 and 7011 alclad 7075 provide significantly improved mechanical properties. Alloys 7008 and 7011 are not suitable claddings for the recently introduced alloy 7050, however, because the composite could not be recycled to make alloy 7050. Consequently, a new alloy was needed to provide alclad 7050 sheet having a highly desirable combination of high strength, good fatigue characteristics, and high resistance to corrosion.

Subject
New alloys, Corrosion resistant alloys, Magnesium alloys, Fatigue crack growth rate, Mechanical properties, Composites, Heat, Zirconium alloys, Corrosion protection, Fatigue, Alloys, Yield strength, Fatigue strength
© 1975 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).
1975
Association for Materials Protection and Performance (AMPP)
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