F. Sur-la, A -sur la réflexion 200 alors qu'on discerne plus difficilement (intensité plus faible) deux franges noires -distribution spatiale A'/B'/A'-sur la réflexion 220. Les valeurs desépaisseurs desépaisseurs calculées sont approximativement 40, 143 et 247 µm pour les trois premiers maxima de la réflexion 200 et 51 et 185 µm pour les deux premiers maxima de la réflexion 220. Ces valeurs sont en accord avec les dimensions de l'´ echantillon

L. Fig, 8.7 montre une vue en projection de la dendrite le long de son axe de croissance, la Fig

. Fig, 6 ? Al-7.0wt%Si. Positions des sections virtuelles choisies pour la reconstruction des sections transverses de la dendrite

. Dans-le-cas-de-l, alliage Al-3.5wt%Ni, deux dendrites (d1 et d2) ontétéétudiéesontétéontétéétudiées. Nous allons montrer que -bien qu'appartenantàappartenantà la même microstructure -ces dendrites illustrent deux types de croissance différents : croissance dans un environnement " confiné " et croissance " libre

. Al-3, 5wt%Ni-d1 Six sections transverses (Fig. 8.9) ontétéontété reconstruitesàreconstruitesà partir des positions et intensités des franges noires/blanches et des valeurs calculées pour lesépaisseurslesépaisseurs

. Cependant, est pas isolée et sa croissance est visiblement confinée par les dendrites voisines (Fig. 8.3) Ce " confinement " est probablementàprobablementà l'origine de la légère asymétrie observée dans le plan de l'´ echantillon. La symétrie miroir par rapport au plan (100) n'´ etant plus concevable

. Comme-la-dendrite-est-un-objet-fini, dérivée, 3. valeur absolue et 4. intégrale) dans le sens opposé (i.e. en partant de l'autre bord de la dendrite) pour finalement considérer le minimum des deux intégrales obtenues, on effectue les mêmes opérations

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