Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1998-02-24
1999-03-23
Phipps, Margery
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148563, 148402, C21D 806
Patent
active
058853812
ABSTRACT:
The present invention provides a Ni--Ti--Pd superelastic alloy material of a composition consisting of, by atomic percent, 34 to 49% nickel, 48 to 52% titanium and 3 to 14% palladium. Optionally, a part of nickel and/or titanium of this alloy is replaced with one or more elements selected from a group of Cr, Fe, Co, V, Mn, B, Cu, Al, Nb, W and Zr such that these elements to be replaced amount to 2% or less in total (by atomic percent), wherein a stress hysteresis between the loading and unloading stresses in the stress-strain curve at temperatures between Af and Af+5.degree. is as small as 50 to 150 MPa. Since the Ni--Ti--Pd superelastic alloy material having the above composition is excellent in hot workability, it can be hot-worked into a wire having a diameter up to the range from 1 to 5 mm and manufactured at a low cost. Then, a final heat-treatment is given to the hot-worked material at a temperature in the range from 300.degree. to 700.degree. C. through a step of final cold-drawing at a reduction ratio in a cross section area of not less than 20%, whereby an excellent superelastic material is obtained, with a stress hysteresis in the range from 50 to 150 MPa, and a residual strain of 0% or close to 0% after unloading, and which can be suitably used for an orthodontic archwire.
REFERENCES:
patent: 4849032 (1989-07-01), Kawaguchi
patent: 4865663 (1989-09-01), Tuominen et al.
patent: 5358796 (1994-10-01), Nakamura et al.
patent: 5641364 (1997-06-01), Golberg et al.
Derwent Abstract 88-024459 of JP 62-284047 Dec 1987.
Derwent Abstract of JP 62-060,836 Mar. 1987.
Mitose Kengo
Ueki Tatsuhiko
Phipps Margery
The Furukawa Electric Co. Ltd.
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