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US4894100A
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Ti-Ni-V shape memory alloy
Assignee: Tokin Corp
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Filing: 1988-01-07
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Granted: 1990-01-16
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Expires: 2008-01-07
Abstract
Abstract A shape memory alloy consisting, by atomic ratio, of V 0.25-2.0% and the balance of Ni and Ti, an atomic ratio of Ni and Ti being 0.96-1.06. The shape memory alloy has a good workability and a reduced temperature difference between a martensitic transition start point and an austenitic transition finish point. When the atomic ration of Ni/Ti is 0.96-1.02, the martensitic transition start point is the room temperature or higher. When the atomic ratio of Ni/Ti is 1.02-1.06, the martensitic transition start point is the room temperature or lower. The shape memory alloy has a pseudo elasticity.
Inventors
- 👤 Kiyoshi Yamauchi
- 👤 Shoichi Sato
- 👤 Hideo Takaara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:51
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22F; C22F1/00; C22F1/006
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
55 words
A shape memory alloy having a good workability and a reduced temperature difference between a martensitic transition start point and an austenitic transition finish point, which consists of V 0.25-2.0 at %, Ti 48.5 at % or more, and the balance Ni, the atomic ratio of Ni/Ti being 0.96-1.06, said nickel excluding 50 at %.
Claim 2
Dependent Claim
55 words
A shape memory alloy having a good workability and a reduced temperature difference between a martensitic transition start point and an austenitic transition finish point, which consists of V 0.25-2.0 at %, Ti 48.5 at % or more, and the balance Ni, the atomic ratio of Ni/Ti being 0.96-1.06, said nickel excluding 50 at %.
Claim 3
Dependent Claim
29 words
A shape memory alloy as claimed in claim 1, wherein the atomic ratio of Ni/Ti is 0.96-1.02, and the martensitic transition start point is the room temperature or higher.
Claim 4
Dependent Claim
29 words
A shape memory alloy as claimed in claim 1, wherein the atomic ratio of Ni/Ti is 1.02-1.06, and the martensitic transition start point is the room temperature or lower.
Claim 5
Dependent Claim
22 words
A shape memory alloy as claimed in claim 3, which is characterized by a pseudo elasticity at the room temperature or lower.
Claim 6
Dependent Claim
87 words
A thermoresponsive article having a thermoresponsive point of a temperature higher than the room temperature, wherein said article is made of the shape memory alloy as claimed in claim 2, said article memorizing a predetermined shape present at a temperature range on and above said austenitic transition finish point, said predetermined shape being memorized by deforming said article, after formed by a cold working, into said predetermined shape and heat treating said article having the predetermined shape at a temperature of 425°-525 ° C. for 10-60 minutes.
Claim 7
Dependent Claim
84 words
A thermoresponsive article having a thermoresponsive point lower than the room temperature, wherein said article is made of the shape memory alloy as claimed in claim 3, said article memorizing a predetermined shape present at a temperature range on and above said austenitic transition finish point, said predetermined shape being memorized by deforming said article, after formed by a cold working, into said predetermined shape and heat treating said article having the predetermined shape at a temperature of 425°-525 ° C. for 10-60 minutes.
Claim 8
Dependent Claim
22 words
A shape memory alloy as claimed in claim 2, wherein said alloy is represented by Ti 50-x/2 Ni 50-x/2 V x (0.25≦x<2.0).
Claim 9
Dependent Claim
24 words
A shape memory alloy as claimed in claim 2, wherein said alloy is represented by Ti 50 .75 Ni 48 .75 V 0 .5.
Claim 10
Dependent Claim
22 words
A shape memory alloy as claimed in claim 3, wherein said alloy is represented by Ti 49-x Ni 51 V x (0.25≦x<0.50).
Claim 11
Dependent Claim
22 words
A shape memory alloy as claimed in claim 3, wherein said alloy is represented by Ti 49-x/2 Ni 51-x V x (0.25≦x<2.0).
Claim 12
Dependent Claim
24 words
A shape memory alloy as claimed in claim 3, wherein said alloy is represented by Ti 49 Ni 51-x V x (0.25≦x<2.0, excluding x=1).
References Cited (Backward Citations)
US4505767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |