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- W2051219389 abstract "The strengthening of the intermetallic compound Ni3Al by boron addition has been investigated via the rapid solidification technique of melt spinning. Using X-ray diffraction, differential thermal analysis and transmission electron microscopy it is shown that by rapid solidification up to 1.5 at.% boron can be held in solution in the aluminide without formation of boride. The lattice parameter results further show that the boron atoms in solution tend to occupy the interstitial sites, generate large lattice strain, and thereby strengthen the Ni3Al substantially. For example, addition of 1 at.% boron increases the room temperature yield strength of rapidly solidified Ni3Al from ∼480to∼750MPa. This represents a strengthening potency significantly larger than that of substitutional solutes. Nous avonsétudiéle durcissement du composéintermétallique Ni3Al par l'addition de bore, par la technique de solidification rapide sur ronleau du métal fondu. La diffraction de rayons X, l'analyse thermique différentielle et la microscopieélectronique ont permis de montrer que l'on peut retenir par solidification rapide jusqu'à1,5 at.% de bore en solution dans l'aluminure sans formation de borure. Les résultats concernant le paramètre réticulaire montrent de plus que les atomes de bore tendentàoccuper les sites interstitiels de la solution solide, qu'ils produisent de fortes déformations du réseau et qu'ils durcissent ainsi notablement le Ni3Al. Par exemple, l'addition d' 1 at.% de bore fait passer de 480á750 MPa environ la limiteélastiqueàla température ambiante du Ni3Al rapidement solidifié. Ceci représente une capacitéde durcissement notablement supérieureàcelle des solutés substitutionnels. Die Härtung der intermetallischen Legierung Ni3Al durch Borzugabe wurde mittels rascher Erstarrung durch Schmelzspritzen untersucht. Röntgenbeugung, differentielle thermische Analyse und Durchstrahlungselektronenmikroskopie zeigen, daß durch rasche Erstarrung bis zu 1,5 At.-% Bor in den Aluminiden in Lösung, ohne Bildung von Boriden, gehalten werden kann. Aus Gitterparametermessungen geht ferner hervor, daß die gelösten Boratome zur Besetzung von interstitiellen Plätzen neigen, große Gitterverzerrungen verursachen und damit das Ni3Al beträchtlich härten. Zum Beispiel erhöht sich die Fließspannung des rasch erstarrten Ni3Al bei Raumtemperatur von ∼480auf∼750MPa. Diese Härtungsfähigkeit des Bors ist beträchtlich größer als die substitutioneller Zugaben." @default.
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- W2051219389 date "1984-10-01" @default.
- W2051219389 modified "2023-09-23" @default.
- W2051219389 title "Boron extended solubility and strengthening potency in rapidly solidified Ni3Al" @default.
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- W2051219389 doi "https://doi.org/10.1016/0001-6160(84)90226-8" @default.
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