Effects of boron on the microstructure and thermal stability of directionally solidified NiAl–Mo eutectic / A. Gali in Acta materialia, Vol. 58 N° 2 (Janvier 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 421-428 Titre : Effects of boron on the microstructure and thermal stability of directionally solidified NiAl–Mo eutectic Type de document : texte imprimé Auteurs : A. Gali, Auteur ; H. Bei, Auteur ; E.P. George, Auteur Article en page(s) : pp. 421-428 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Interfaces Segregation Directional solidification Coarsening Composites Index. décimale : 669 Métallurgie Résumé : Microalloying with 0.01 at.% B decreases the range of growth speeds over which a well-aligned fibrous eutectic microstructure can be obtained in directionally solidified NiAl–Mo. Compared to the undoped alloy, the size/spacing of the Mo fibers is larger, and the fiber density smaller, in the B-doped alloy. Annealing at 1400 °C coarsens the fibers by a mechanism involving fault migration and annihilation driven by diffusion along the fiber–matrix interface. The coarsening kinetics, given by the decrease in Mo fiber density with time, is exponential, and microalloying with B decreases the coarsening rate. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Effects of boron on the microstructure and thermal stability of directionally solidified NiAl–Mo eutectic [texte imprimé] / A. Gali, Auteur ; H. Bei, Auteur ; E.P. George, Auteur . - pp. 421-428. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 421-428 Mots-clés : Interfaces Segregation Directional solidification Coarsening Composites Index. décimale : 669 Métallurgie Résumé : Microalloying with 0.01 at.% B decreases the range of growth speeds over which a well-aligned fibrous eutectic microstructure can be obtained in directionally solidified NiAl–Mo. Compared to the undoped alloy, the size/spacing of the Mo fibers is larger, and the fiber density smaller, in the B-doped alloy. Annealing at 1400 °C coarsens the fibers by a mechanism involving fault migration and annihilation driven by diffusion along the fiber–matrix interface. The coarsening kinetics, given by the decrease in Mo fiber density with time, is exponential, and microalloying with B decreases the coarsening rate. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]

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