J. Phys. Colloques
Volume 48, Number C3, Septembre 19874th International Aluminium Lithium Conference
|Page(s)||C3-239 - C3-249|
J. Phys. Colloques 48 (1987) C3-239-C3-249
DEVELOPMENT OF SUPERPLASTIC 8090 AND 8091 SHEETR. GRIMES1, W.S. MILLER1 et R.G. BUTLER2
1 British Alcan Aluminium plc, c/o Alcan International Limited, Southam Road, Banbury, GB-Oxon OX16 7SP, Great-Britain
2 Superform Metals Limited, P.O. Box 150, GB-Worcester WR3 8TR, Great-Britain
The paper considers the superplastic forming of the alloys Lital 8090 and Lital 8091 after processing by a route designed to confer superplastic properties. Examples of the components that can be fabricated by superplastic forming are shown and the properties that can be achieved in such components after different heat treatment procedures are given. Lital 8091 possesses somewhat better forming characteristics and is capable of achieving appreciably higher strengths in the formed product. However, the alloy is relatively quench sensitive and reasonably rapid cooling is necessary to achieve the maximum properties. Lital 8090 has somewhat reduced forming capabilities and can only achieve lower strength. However, it is less quench sensitive and near to full strength properties can be achieved by air cooling from the solution treatment temperature.