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• W2000949689 abstract "The atomistic defect structures of Ni3Al containing C, B and Be atoms were investigated using Debye-Scherrer technique and X-ray diffractometer. It was proposed that the elements of C and B occupy on the interstitial site of the body centered position of the Ll2 structure while the elements of Be substitute on the Al site of the Ll2 structure. Also, it was observed that the additions of C and B atoms into the Ni3Al induced the further ordering of the constituent atoms of Ni and Al. This was more significant at the off-stoichiometric compositions of the Ni3Al. The energetic consideration, involving the nearest neighbor interactions between the constituent atoms, and between the interstitial atom and the constituent atom, was presented in order to explain the further ordering of the constituent atoms. Nous avons étudié, à l'aide de la technique de Debye et Scherrer et du diffractomètre de rayons X, la structure des défauts à l'échelle atomique dans Ni3Al contenant des atomes de carbone, de bore et de béryllium. Nous en concluons que les éléments C et B occupent le site interstitiel (en position centrée) de la structure Ll2 alors que Be se place en substitution sur le site Al de la structure Ll2. En outre, nous observons que l'addition d'atomes de carbone et de bore dans Ni3Al provoque la mise en ordre ultérieure des atomes constituants Ni et Al; ce phénomène est d'autant plus marqué pour les compositions non-stoechiométriques de Ni3Al. Pour expliquer cette misse en ordre ultérieure des atomes constituants, nous présentons l'aspect énergétique oú nous tenons compte des interactions de premiers voisins entre les atomes constituants, et entre l'atome interstitiel et les atomes constituants. Die atomare Struktur von Ni3, Al, welches C-, B- und Be-Atome enthält, wird mit dem Debye-Scherrer-Verfahren und im Röntgendiffraktometer untersucht. Die C- und B-Atome besetzen interstitielle Plätze in der raumzentrierten Lage der Ll2-Struktur, die Be-Atome sitzen substitutionell auf den Al-Plätzen der Ll2-Struktur. Auβerdem wurde gefunden, daβ Zugaben von C- und b-Atomen zum Ni3Al die weitere Ordnungseinstellung der Ni- und AI-Atome förderte. Das war besonders deutlich bei nicht-stöchiometrischen Zusammensetzungen von Ni3Al. Die Förderung der Ordnungseinstellung wird mit energetischen Betrachtungen, die die Wechselwirkung nächster Nachbarn zwischen den Hauptatomen der Legierung und zwischen dem interstitiellen Atom und den Hauptatomen berücksichtigen, erklärt." @default.
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• W2000949689 date "1988-07-01" @default.
• W2000949689 modified "2023-09-29" @default.
• W2000949689 title "Atomistic defect structures of Ni3Al containing C, B and Be" @default.
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• W2000949689 doi "https://doi.org/10.1016/0001-6160(88)90250-7" @default.
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