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A new thermo-mechanical procedure for improving the ductility and toughness of AlZnMgCu alloys in the transverse directions

Authors
Journal
Materials Science and Engineering
0025-5416
Publisher
Elsevier
Publication Date
Volume
14
Issue
1
Identifiers
DOI: 10.1016/0025-5416(74)90120-7

Abstract

Abstract A thermo-mechanical processing technique for reducing the transverse effect of high strength Al alloys is described. The technique, called Intermediate Thermo-Mechanical Treatment (ITMT) was applied to a high purity AlZnMgCu, 7075 type alloy. ITMT is based on the combination of warm deformation and heat treatments, and involves the recrystallization of the ingot in small equiaxed grains, in an intermediate stage of the working. As a result of the present processing, the alloy exhibits better ductility, toughness and stress corrosion properties, for a given strength, than have conventionally processed materials, mainly in the transverse directions. Moreover, it has been found that the combination of ITMT and FTMT (Final Thermo-Mechanical Treatment) results in wrought products characterized by exceptionally high properties.

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