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US 4,381,954 AGranted
Method of increasing the ductility of articles formed from superplastic alloy and article
AssigneeEuropean Atomic Energy Community (Euratom)
InventorsGiovanni Piatti, Giovanni Pellegrini
Life of this patent
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Abstract
A method of increasing the ductility of articles formed from a superplastic alloy, the superplastic alloy consisting of aluminium, from 5 to 10% by weight of calcium and at most 1% by weight of impurities, characterized in that these articles, after their superplastic forming, are heated for at least 30 minutes to a temperature of between 400.degree. C. and 600.degree. C.
Claims5
A method of producing articles formed from a superplastic aluminum base alloy having improved ductility comprising:
- melting together in the absence of oxygen a mixture consisting of 5 to 10% by weight calcium and not more than 1% impurities and the remainder aluminum;
- subjecting the resulting alloy to mechanical treatment at a temperature of at least 270.degree. C.;
- superplastic forming the desired article;
- heating the formed article to a temperature of between 400.degree. C. and 600.degree. C. for at least 30 minutes.
1 more element
Dependencies are inferred from the claim text.