Method of manufacturing high-temperature shape memory alloys

Details Method of manufacturing high-temperature shape memory alloys Method of manufacturing high-temperature shape memory alloys

1995-10-27

1997-06-24

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148402, C22C 102, C22F 116

Patent

active

056413645

ABSTRACT:
A method of manufacturing a high-temperature shape memory alloy includes the steps of cold-working a high-temperature shape memory alloy, in which a reverse martensite transformation start temperature (As) in a first heating after cold working reaches 350.degree. C. or above. Thereafter, the cold-worked alloy undergoes a first heat treatment for a period of time within the incubation time required for recrystallization or less, and at a temperature higher than a reverse martensite transformation finish temperature (Af). Finally, the resultant alloy is annealed with a second heat treatment, at a temperature which is not less than the plastic strain recovery temperature and not more than the recrystallization temperature. Specifically, the first heat treatment is performed for a period of three minutes or less at a temperature which exceeds 500.degree. C. and which is lower than the melting point of the alloy. The composition of the high-temperature shape memory alloy is Ti.sub.50 Ni.sub.50-x Pd.sub.x (x being 35 to 50 at %), Ti.sub.50-x Ni.sub.50 Zr.sub.x (x being 22 to 30 at %), Ti.sub.50-x Ni.sub.50 Hf.sub.x (x being 20 to 30 at %) or the like.

REFERENCES:
patent: 4865663 (1989-09-01), Tuominen et al.
patent: 4935068 (1990-06-01), Duerig
patent: 5114504 (1992-05-01), AbuJudom et al.

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