Methods of processing nickel-titanium shape memory alloys

C - Chemistry – Metallurgy – 22 – F

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C22F 1/10 (2006.01) C22C 14/00 (2006.01) C22C 19/00 (2006.01)

Patent

CA 2522217

Embodiments of the present invention provide methods of processing nickel- titanium alloys including from greater than 50 up to 55 atomic percent nickel to provide a desired austenite transformation temperature and/or austenite transformation temperature range. In one embodiment, the method comprises selecting a desired austenite transformation temperature, and thermally processing the nickel-titanium alloy to adjust an amount of nickel in solid solution in a TiNi phase of the alloy such that a stable austenite transformation temperature is reached, wherein the stable austenite transformation temperature is essentially equal to the desired austenite transformation temperature.

L'invention porte sur des procédés de traitement d'alliages de nickel-titane à mémoire de forme à 50 à 55 % de pourcentage atomique de nickel permettant d'obtenir la température de transformation austénitique désirée ainsi que la plage de températures de transformation austénitique désirée. Dans une exécution, le procédé consiste à sélectionner la température de transformation austénitique désirée, puis à traiter thermiquement l'alliage pour fixer la quantité de Ni en solution solide dans la phase TiNi de l'alliage pour atteindre une température de transformation austénitique stable essentiellement égale à celle qui est désirée.

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