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US5114504A
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High transformation temperature shape memory alloy
Assignee: Johnson Controls Technology Co
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Filing: 1990-11-05
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Granted: 1992-05-19
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Expires: 2010-11-05
Abstract
Abstract A high temperature titanium-based shaped memory alloy contains from at least 0.1 at. % hafnium. Articles formed from the disclosed alloy have high transformation temperatures. The alloy of the invention can be successfully hot and cold worked to make articles such as springs and wires.
Inventors
- 👤 II David N. AbuJudom
- 👤 Paul E. Thoma
- 👤 Ming-Yuan Kao
- 👤 David R. Angst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:53
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/006
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
108 words
An article made of a shape memory titanium-based alloy, wherein said alloy has been subjected to a memory-imparting heat treatment, and the alloy consists essentially of a composition of the general formula: M.sub.A Ti.sub.(100-A-B) X.sub.B wherein M consists essentially of nickel, A is from about 30 to 51 at. %, B is from about 3.5 to 40 at. %, and X is a combination of Hf and Zr, provided that: (a) the amount of Zr does not exceed about 25 at. % in the alloy; (b) the amount of Hf is at least 0.1 at. %; and (c) the sum of A+B is 80 at. % or less.
Claim 2
Dependent Claim
108 words
An article made of a shape memory titanium-based alloy, wherein said alloy has been subjected to a memory-imparting heat treatment, and the alloy consists essentially of a composition of the general formula: M.sub.A Ti.sub.(100-A-B) X.sub.B wherein M consists essentially of nickel, A is from about 30 to 51 at. %, B is from about 3.5 to 40 at. %, and X is a combination of Hf and Zr, provided that: (a) the amount of Zr does not exceed about 25 at. % in the alloy; (b) the amount of Hf is at least 0.1 at. %; and (c) the sum of A+B is 80 at. % or less.
Claim 3
Dependent Claim
15 words
The article of claim 1, wherein A is from about 42 to 50.5 at. %.
Claim 4
Dependent Claim
15 words
The article of claim 1, wherein A is from about 48 to 50 at. %.
Claim 5
Dependent Claim
15 words
The article of claim 1, wherein B is from about 5 to 25 at. %.
Claim 6
Dependent Claim
22 words
The article of claim 1, wherein X comprises about 5 at. % or less, relative to hafnium, of zirconium as an impurity.
Claim 7
Dependent Claim
10 words
The article of claim 1, wherein M consists of nickel.
Claim 8
Dependent Claim
31 words
The article of claim 1, wherein said article has as-cast, fully-annealed transition temperatures wherein A f is at least about 110° C., and M s is at least about 80° C.
Claim 9
Dependent Claim
23 words
The article of claim 1, wherein said alloy has been cold worked and subsequently heat treated to impart memory of a predetermined shape.
Claim 10
Dependent Claim
29 words
The article of claim 1, wherein the as-cast A f is in the range of 110°-500° C. and the as-cast M s is in the range of 80°-400° C.
Claim 11
Dependent Claim
148 words
An article made of a titanium-hafnium based alloy having shape memory characteristics, made by the process comprising the steps of: making a titanium-based shape memory alloy consisting essentially of a composition of the general formula: M.sub.A Ti.sub.(100-A-B) X.sub.B wherein M consists essentially of nickel, A is from about 30 to 51 at. %, B is from about 3.5 to 40 at. %, and X is Hf or a combination of Hf and Zr, provided that (a) the amount of Zr does not exceed about 25 at. % in the alloy, (b) the amount of Hf is at least 0.1 at. %, and (c) the sum of A+B is 80 at % or less; hot working the alloy above its recrystallization temperature; cold working the alloy; forming the alloy into a desired shape; and imparting a shape memory of the desired shape to said alloy to form said article.
Claim 12
Dependent Claim
148 words
An article made of a titanium-hafnium based alloy having shape memory characteristics, made by the process comprising the steps of: making a titanium-based shape memory alloy consisting essentially of a composition of the general formula: M.sub.A Ti.sub.(100-A-B) X.sub.B wherein M consists essentially of nickel, A is from about 30 to 51 at. %, B is from about 3.5 to 40 at. %, and X is Hf or a combination of Hf and Zr, provided that (a) the amount of Zr does not exceed about 25 at. % in the alloy, (b) the amount of Hf is at least 0.1 at. %, and (c) the sum of A+B is 80 at % or less; hot working the alloy above its recrystallization temperature; cold working the alloy; forming the alloy into a desired shape; and imparting a shape memory of the desired shape to said alloy to form said article.
Claim 13
Dependent Claim
39 words
The article of claim 10, wherein said shape memory is imparted so that said article has an as-cast transition temperature range wherein A f is at least about 110° C. and M s is at least about 80° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |