US4639281A
Expired / Lapsed
US
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Advanced titanium composite
Assignee: McDonnell Douglas Corp
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Filing: 1983-12-02
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Granted: 1987-01-27
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Expires: 2003-12-02
Abstract
Abstract A titanium alloy has greatly increased specific strength and increased thermostability. The alloy consists of a titanium matrix in which fibrous dispersoids are formed in situ. The dispersoids are rod and/or plate shaped and have a diameter or depth of about 0.1-0.5 microns and an aspect ratio of about 5-10. A typical alloy has the composition A-X where A is titanium or titanium alloy and X is boron, carbon, nitrogen, mixtures thereof, or mixtures with silicon.
Inventors
- 👤 Shankar M. Sastry
- 👤 James E. O'Neal
- 👤 Tzy C. Peng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:25
CPC Classifications
C; C22; C22C; C22C49/00; C22C49/02; C22C49/10; C22C49/11; C22C14/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
In an annealed titanium alloy, the improvement consisting essentially of the inclusion of anneal developed in situ formed fibrous dispersoids in a rapidly solidified titanium matrix, the dispersoids being effective to produce an increased strength in the resulting alloy.
Claim 2
Dependent Claim
39 words
In an annealed titanium alloy, the improvement consisting essentially of the inclusion of anneal developed in situ formed fibrous dispersoids in a rapidly solidified titanium matrix, the dispersoids being effective to produce an increased strength in the resulting alloy.
Claim 3
Dependent Claim
44 words
The alloy of claim 1 where the alloy has the formula of A-X and where A is selected from the group consisting of titanium and titanium alloys selected from the group consisting of Ti, Ti-Al, Ti-Al-Er, Ti-Al-V, Ti-Al-Nb, Ti-Al-Ni, Ti-Al-Sn, Ti-Al-Mo-V, Ti-Al-Sn-Zr-Mo, or Ti-V-Cr-Zr-Sn.
Claim 4
Dependent Claim
28 words
The alloy of claim 2 where X is a dispersoid forming materials selected from the group consisting of C, B, B-N, Si-C, B-C, Si-N, N, and mixtures thereof.
Claim 5
Dependent Claim
23 words
The alloy of claim 1 wherein the proportion of dispersoid forming material is up to about 2% by weight of the resulting alloy.
Claim 6
Dependent Claim
28 words
The alloy of claim 1 where the alloy has an increase in specific strength of up to 50% or more over comparably treated non-fibrous dispersoid containing titanium alloys.
Claim 7
Dependent Claim
18 words
The alloy of claim 5 wherein the specific strength is increased up to about 1400 MPa or more.
Claim 8
Dependent Claim
15 words
The alloy of claim 1 wherein the dispersoids are predominantly plate-like, rod-like, or mixtures thereof.
Claim 9
Dependent Claim
27 words
The alloys of claim 7 wherein the dispersoids have diameter of between about 0.1 and 0.5 microns and have an aspect ratio between about 5 and 10.
Claim 10
Dependent Claim
24 words
The alloy of claim 1 wherein the dispersoids are borides, carbides, or nitrides of titanium or mixtures thereof with each other or with silicon.
Claim 11
Dependent Claim
30 words
The alloy of claim 1 wherein the alloy has a 0.2% yield stress of up to about 600 MPa and an ultimate tensile strength of up to about 700 MPa.
Claim 12
Dependent Claim
23 words
The alloy of claim 3 wherein the proportion of dispersoid forming material is up to about 2% by weight of the resulting alloy.
References Cited (Backward Citations)
US3070468A
Cited
US3052538A
Cited
US3205099A
Cited
US3159908A
Cited
US3379522A
Cited
US3728088A
Cited
US3622406A
Cited
US3679403A
Cited
US3807995A
Cited
GB2114154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |