Numéro
J. Phys. Colloques
Volume 48, Numéro C3, Septembre 1987
4th International Aluminium Lithium Conference
Page(s) C3-407 - C3-413
DOI https://doi.org/10.1051/jphyscol:1987346
4th International Aluminium Lithium Conference

J. Phys. Colloques 48 (1987) C3-407-C3-413

DOI: 10.1051/jphyscol:1987346

COPRECIPITATION HARDENING IN Al-Li-Cu-Mg ALLOYS

P. SAINFORT et B. DUBOST

Cégédur-Péchiney, Centre de Recherche et Développement, B.P. 27, F-38340 Voreppe, France


Abstract
The structural features of the matrix precipitates families governing the strength of Al-Li-Cu-Mg(-Zr) alloys within a wide composition range are discussed. The specific effects of alloying and heat treating on matrix coprecipitation of δ', GPB zones, S', S, T' or θ', T1, and T2 and the dependence of the solid solution decomposition sequence on cold working between quenching and ageing are illustrated by transmission electron microscopy results. Conventional artificial ageing treatments and selective reversion heat treatments, performed on both laboratory and commercial alloys, allow to evaluate the intrinsic contributions of matrix precipitates on complex coprecipitation hardening in industrial alloys.