. La-limite-d, ´ elasticité est très faible comparéè a celle des basses températures (mesures de limite d'´ elasticité de Hanriot sur l'AM1 orienté <001>, pp.490-950

. Mpà-a-650°cminer, existe plus (sauf pour <111> avec une limite d'´ ecoulement supérieure d'environ 30 MPa en traction ) Ceci avait déjàdéjàété constaté pour la limite d'´ elasticitéelasticitéà 0 audeì a de 900°C. Enfin, la présence d'un temps de maintien en traction ne modifie pas la courbe d'´ ecrouissage cyclique. En ce qui concerne les modes de déformation, certains auteurs Poubanne, 1989) ´ evoquent l'homogénéité de la déformationdéformationà 950°C. Ceci est dûdûà l'absence de lignes de glissement visibles, masquées par l'oxydation. Mais des essais sous vide (Hanriot, 1993) ont révélé des bandes de glissement bien nettes, 2% par Shah et Duhl sur le PWA1480 (Shah et Duhl Il appara??tappara??t alors que les orientations <001> et <111> peuvent se déformer de façon homogène ou hétérogène. On constate que les basses vitesses de déformation associées aux fortes contraintes sont un des facteurs responsables de l'hétérogénéité de la déformation, 1984.

. Clément, 1991b) a montré, grâcè a des expériences sur des monocristaux orientés <111>, que le glissement cubique est possible aux basses températures dans la phase ? du CMSX-2 (figure 2.8) On voit bien que le glissement cubique est un phénomène thermiquement activé

.. Oxydation-des-superalliagesàsuperalliagesà-base-de-nickel, 110 4.1.1 Mécanismes d'oxydation surfacique -cas, p.118

. Dans-ce-cas, La fissure cro??tcro??t d'abord vers le bas, puis unedeuxì eme branche tendàtendà appara??treappara??tre en haut (figure 6.39, (b)). La fissuration est diffuse et ce phénomène s'accentue au point de rendre la convergence très lente puis impossible après 54 cycles. Il est donc difficile d'estimer la longueur de fissure. De plus, même si la fissure avaitétéavaitété " mesurable " , la vitesse n'aurait probablement pasétépasété la même que pour le calcul de référence en dépit de l

B. Figure, Influence de la perturbation sur le taux de restitution d'´ energié elastique G (avec la méthode de Parks)

E. F. En-faisant-le-calcul, avec le comportementélastiquecomportementélastique anisotrope de l'AM1àAM1à 950°C. Le passage de G ` a K est fait grâcè a l'´ equation B

E. F. En-faisant-le-calcul, avec le comportementélastiquecomportementélastique anisotrope de l'AM1àAM1à 950°C. Le passage de G ` a K est fait grâcè a l'´ equation B

. En-ce-qui-concerne-la-dépendance-du-facteur-d, intensité des contraintes K ` a l'anisotropie du matériau, on constate que K est plus faible si l'on prend en compte l'anisotropie par rapportà rapportà ce qui est donné par la formule de Strawley. Néanmoins, cette formule décrit très bien K dans le cas isotrope

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