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US4639281A
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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 17:02
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.
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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) | 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 |