The internal oxidation of Cu-Si alloys has been investigated with particular attention to the kinetics of formation of the precipitated oxide. Experiments were performed on oopper alloys containing 0.067!, 0.15i and 0.27, wt. y0 Si at 928,998 and 1073°K. Measurements included diffusion coefficients of oxygen m copper and number, size and size distribution of oxide particles for various penetration depths of the oxidation front. The results were analyzed on the basis of previously formulated mechanisms for internal oxidation and the Becker-Diiring nucleation theory and, on this basis, estimates of supersaturation at the instant of nucleation and of the surface energy between the copper matrix and the precipitated SiO, phase were made.
OXYDATION INTERNE DES ALLIAGES
Cu-Si On Btudie l'oxydation interne des alliages Cu-Si en s'interessant particuli&rement 8. la cinetique de formation du precipite d'oxyde.
Les experiences sont faites sur des alliages de cuivre contenant, en poids, 0,067,, 0,15,, et 0,27,% Si a 928, 998 et 1073°K. On mesure: les coefficients de diffusion de l'oxygene dans le cuivre ainsi que le nombre, la taille et la distribution des tailles des particules d'oxyde, pour diverses profondeurs de penetration du front d'oxydation.