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, Associée à un possible ancrage mécanique, la fusion locale du métal permet une amélioration de la cohésion de l'alliage AZ91 fritté, mise en évidence par le changement de mode de rupture des échantillons ; passant d'un affaissement en cône, typique des matériaux granulaires, à une rupture par cisaillement, semblable à celle des alliages AZ91 de coulée. Outre le changement de mode rupture, l'amélioration de la cohésion a été visible par l'augmentation simultanée de la capacité au durcissement Hc et de la déformation ?UCS avec l'ajout de SiC. Au-delà de 5%m, la déformation ?UCS diminue progressivement avec la fraction de particules de SiC. Ceci est dû à la densification incomplète du composite, à la taille et au nombre d'agglomérats de SiC qui deviennent critiques et contribuent à fragiliser le matériau. Ainsi, le taux de 5%m de SiC permet d'aboutir à des propriétés en compression quasi-statique optimales, devenue importante, de petits grains ?-Mg issus de la fusion locale de l'alliage

, Leur diminution a été supposée d'une part due à la prédominance des phénomènes d'adoucissement thermique (causé par l'échauffement adiabatique) et de vieillissement dynamique (induit par les solutés) se produisant dans l'alliage fritté à 500°C, devant l'activation des systèmes de glissement non basaux. D'autre part, en comparaison des composites HP-SiC du Chapitre 4 frittés sous 230 MPa, les liaisons mécaniques AZ91-SiC demeureraient plus faibles dans les composites frittés ici sous 60 MPa, amenuisant le phénomène d'ancrage mécanique. En effet, observée en compression quasi-statique avec l'ajout de particules SiC, l'amélioration de la cohésion n'a pas été perçue en compression dynamique. Les composites ont montré une rupture prononcée par fragmentation et des déformations ?UCS similaires à celle de l'alliage fritté. Il est ainsi apparu que les composites, étudiés dans cette partie, ont la même ductilité en dynamique que l'alliage fritté qui les compose. Autrement dit, il a été permis d'accroître les propriétés YCS, UCS et Ea c de l'alliage en dynamique avec l, En compression dynamique, les composites ont montré des tendances proches de celles de l'alliage AZ91 fritté qui les compose en terme de sensibilité à la vitesse de déformation

. Comparativement, avec des propriétés en compression quasi-statique optimales et une amélioration importante des propriétés en compression dynamique de l'alliage AZ91, le taux de 5%m de SiC apparaît le plus intéressant pour renforcer l'alliage AZ91 tout en limitant l'augmentation de sa densité et en améliorant sa

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