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- W1992161909 abstract "MMC with intermetallic matrices (Ni3Al, NiAl) reinforced with continuous Al2O3) fibres were investigated with regard to interfacial reactions during diffusion bonding, by means of TEM, EDS and HRTEM. The specimens were fabricated by hot pressing for 2 h, at 1200–1280°C for the Ni3Al matrix and at 1300-1450°C for the NiAl matrix. Experimental results revealed a diffusion of Ni from the Ni3Al matrix into the fibres during diffusion bonding. As a consequence of the diffusion process a chemical reaction took place at the interfacial area: thin films of about 5–20 nm thickness appeared in some sections of the interface, in which the lattice planes were disordered and porous compared with matrix and fibre; in other sections spinels with compound oxides of Al and Ni or (Ni, Mg)Al2O4 were formed as interfacial reaction products. In contrast to the results on Ni3Al, specimens with NiAl matrix showed good stability during hot pressing: no obvious diffusion of Ni from the matrix into the fibre could be detected, and no interaction products were apparent in the interface. The potential influence of these interfacial behaviours on the properties of the composites will be discussed. Résumé Nous avons étudié les MMC avec des matrices métalliques (Ni3Al, NiAl) renforcées par des fibres d'Al2O3) continues, avec un intérêt particulier pour les réactions interfaciales de liaison par diffusion aux moyens de TEM, EDS et HRTEM. Nous avons fabriqué les spécimens en comprimant respectivement pendant 2 h, les matrices de Ni3Al à 1200–1280°C et les matrices de NiAl à 1300–1450°C. Les résultats expérimentaux ont révélé une diffusion du Ni de la matrice Ni3Al dans les fibres, au cours de la liaison par diffusion. A la suite du processus de diffusion, il s'est produit une réaction chimique dans la région interfaciale: des couches minces d'à peu près 5–20 nm d'épaisseur sont apparus dans quelques unes des sections de l'interface, dans lesquelles le réseau de plans est désordonné et poreux en comparaison avec les matrices et les fibres; dans d'autres sections il s'est formé des spinelles à base d'oxyde d'Al et de Ni ou d'un composé (Ni, Mg) Al2O4, résultant des réactions interfaciales. En contraste avec les résultats sur Ni3Al, les spécimens avec une matrice de NiAl ont montré une bonne stabilité pendant le pressage à chaud: il n'y a pas eu de diffusion apparente dans l'interface. Nous discuterons de l'influence potentielle de ces comportements d'interfaces sur les propriétés des composites." @default.
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- W1992161909 date "1995-07-01" @default.
- W1992161909 modified "2023-09-26" @default.
- W1992161909 title "Interfacial Chemical Stability During Diffusion Bonding of Al203Fibres with Ni3Al and NiAl Matrices" @default.
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- W1992161909 doi "https://doi.org/10.1179/cmq.1995.34.3.231" @default.
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