C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/10 (2006.01) C21D 8/00 (2006.01) C22C 30/00 (2006.01) C22C 38/06 (2006.01) C22C 38/08 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01)
Patent
CA 2627806
Disclosed is an iron-based alloy having a shape-memory property and superelasticity. The alloy comprises 25-35% by mass of Ni, 13-25% by mass of Co, 2-8% by mass of Al, at least one component selected from the group consisting of 1-5% by mass of Ti, 2-10% by mass of Nb and 3-20% by mass of Ta in a total amount of 1-20% by mass, and the remainder comprising substantially Fe and inavoidable impurities. The iron-based alloy is composed substantially of a .gamma.-phase and a .gamma.'-phase and has a re-crystallized coherent tissue wherein a specific crystal orientation is uniform in the .gamma.-phase, in which the difference between the reverse transformation end temperature and the martensitic transformation start temperature in the thermal hysteresis in martensitic transformation and reverse transformation is 100~C or lower.
La présente invention concerne un alliage à base de fer ayant une propriété à mémoire de forme et une super-élasticité. L'alliage comprend de 25 à 35 % en masse de Ni, de 13 à 25 % en masse de Co, de 2 à 8 % en masse d~Al, au moins un composant choisi dans le groupe constitué de 1 à 5 % en masse de Ti, de 2 à 10 % en masse de Nb et de 3 à 20 % en masse de Ta en une quantité totale de 1 à 20 % en masse, le complément comprenant essentiellement Fe et des impuretés inévitables. L'alliage à base de fer se compose essentiellement d~une phase .gamma. et d~une phase .gamma.~ et a un tissu cohérent recristallisé, où une orientation de cristal spécifique est uniforme dans la phase .gamma., la différence entre la température terminale de la transformation inverse et la température initiale de la transformation martensitique dans l'hystérésis thermique dans la transformation martensitique et la transformation inverse étant inférieure ou égale à 100 °C.
Ishida Kiyohito
Kainuma Ryosuke
Sutou Yuji
Tanaka Yuuki
Japan Science And Technology Agency
Smart & Biggar
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