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Influence of equal-channel angular pressing on precipitation in an Al–Zn–Mg–Cu alloy

✍ Scribed by G. Sha; Y.B. Wang; X.Z. Liao; Z.C. Duan; S.P. Ringer; T.G. Langdon

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
903 KB
Volume
57
Category
Article
ISSN
1359-6454

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✦ Synopsis

Processing by equal-channel angular pressing (ECAP) affects the morphology of g precipitates in an Al-Zn-Mg-Cu (Al-7136) alloy. It is shown by transmission electron microscopy that ECAP changes the orientation of precipitates and this influences the atomic configuration and the interfacial energy at the g/a-Al interfaces. Consequently, g precipitates adopt an isotropic growth mode and evolve into equiaxed particles. A three-dimensional atom probe analysis demonstrates that large g precipitates formed in different numbers of ECAP passes are of similar composition. The coalescence of smaller precipitates, rather than the fragmentation of larger precipitates, dominates the precipitate evolution.

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