US4568398A
Expired / Lapsed
US
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Titanium alloys
Assignee: NATIONAL RESEARCH DEVELOPMENT CORORATON 101 NEWINGTON CAUSEWAY LONDON SE1 6BU ENGLAND A BRITISH Corp
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Filing: 1985-03-27
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Granted: 1986-02-04
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Expires: 2005-03-27
Abstract
Abstract A solid titanium alloy comprises Ti+Co+Cu+ optionally other elements. The titanium is from 95 to 40 wt. %. The liquidus is below 1300 DEG C. and the structure is of small equiaxed high-melting grains surrounded by at least 10 vol. % of low-melting material. This structure is achieved by vigorously agitating the alloy between its liquidus and solidus so as to break up dendrites, and thereby permits the alloy to be subsequently thixocast.
Inventors
- 👤 John V. Wood
- 👤 Bijan Toloui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:18
CPC Classifications
C; C22; C22C; C22C14/00; C22C1/00; C22C1/12; Y; Y10; Y10S; Y10S164/00; Y10S164/90
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
85 words
A solid titanium alloy comprising, other than impurities (if any): (a) from 95 wt % to 40 wt % titanium; and (b) at least one other metal which is a Group IB metal, a Group VIII metal, silicon, chromium or manganese, the total amount of (b) being correspondingly from 5 wt % to 60 wt %, the solid alloy having a homogeneous dispersion of discrete particles of at least one primary solid phase within a matrix of at least one, lower melting secondary solid phase.
Claim 2
Dependent Claim
85 words
A solid titanium alloy comprising, other than impurities (if any): (a) from 95 wt % to 40 wt % titanium; and (b) at least one other metal which is a Group IB metal, a Group VIII metal, silicon, chromium or manganese, the total amount of (b) being correspondingly from 5 wt % to 60 wt %, the solid alloy having a homogeneous dispersion of discrete particles of at least one primary solid phase within a matrix of at least one, lower melting secondary solid phase.
Claim 3
Dependent Claim
21 words
A solid titanium alloy according to claim 1 which has at least one primary solid phase substantially free from interconnecting dendrites.
Claim 4
Dependent Claim
18 words
A solid titanium alloy according to claim 12 which is one of a binary, ternary and quaternary alloy.
Claim 5
Dependent Claim
18 words
A solid titanium alloy according to claim 1 which exhibits a liquidus, at standard pressure, below 1400° C.
Claim 6
Dependent Claim
18 words
A solid titanium alloy according to claim 4 which exhibits a liquidus, at standard pressure, below 1300° C.
Claim 7
Dependent Claim
24 words
A solid titanium alloy according to claim 1 which exhibits at least 10 vol % of liquid fraction at a temperature below 1300° C.
Claim 8
Dependent Claim
26 words
A solid titanium alloy according to claim 1 wherein (b) comprises at least one of Ag, Au, Co, Cr, Cu, Fe, Mn, Ni, Pd or Pt.
Claim 9
Dependent Claim
23 words
A solid titanium alloy according to claim 7 wherein (b) comprises at least one of Ag, Au, Co, Cu, Ni, Pd or Pt.
Claim 10
Dependent Claim
19 words
A solid titanium alloy according to claim 1 wherein (b) comprises from 10 wt % to 40 wt %.
Claim 11
Dependent Claim
18 words
A solid titanium alloy according to claim 1 which is a Ti-Co; Ti-Cu, Ti-Co-Cu; Ti-Cu-Ag or Ti-Co-Cu-Ag alloy.
Claim 12
Dependent Claim
16 words
A solid titanium alloy according to claim 9 wherein (b) comprises up to 25 wt %.
Claim 13
Dependent Claim
15 words
A solid titanium alloy according to claim 1 which exhibits a solidus below 1100° C.
Claim 14
Dependent Claim
47 words
A process for making a solid titanium alloy according to claim 1 which process comprises heating the titanium alloy to produce an alloy mixture which is part liquid and part solid; vigorously agitating the entire alloy mixture to create shear strain therein; and solidifying the alloy mixture.
Claim 15
Dependent Claim
17 words
A process according to claim 13 wherein the titanium alloy is not heated above the liquidus temperature.
Claim 16
Dependent Claim
16 words
A process according to claim 14 wherein the titanium alloy is not heated above 1100° C.
Claim 17
Dependent Claim
31 words
A process according to claim 13 wherein a mould containing the alloy mixture is given an angular velocity sufficient vigorously to agitate the entire alloy mixture to create shear strain therein.
Claim 18
Dependent Claim
24 words
A process according to claim 13 wherein the solid titanium alloy comprises from 40 wt % to 65 wt % of primary solid phase.
Claim 19
Dependent Claim
24 words
A process according to claim 13 wherein the solid titanium alloy comprises from 75 wt % to 90 wt % of primary solid phase.
Claim 20
Dependent Claim
14 words
A process according to claim 13 wherein the alloy so formed is subsequently thixocast.
Claim 21
Dependent Claim
25 words
A process according to claim 19, wherein the alloy is thixocast into a mould cavity which is rammed towards a stationary support for the 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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |