Abstract
Etude experimentale de l'influence de 0,1% at. de Y, Ce, La, et Ca sur la ductilite de l'alliage soumis a des essais de traction entre 573 et 1073 K. On note une augmentation de la ductilite a 973 K et 673 K. Analyse fractographique des surfaces de rupture permettant d'expliquer la cause de cette augmentation. En conclusion, a 673 K, les resultats obtenus sont attribues a une croissance de la resistance des joints de grains due a une reduction de la segregation de soufre aux joints de grains
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