US4676829A
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Cold worked tri-nickel aluminide alloy compositions
Assignee: General Electric Co
•
Filing: 1985-10-03
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Granted: 1987-06-30
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Expires: 2005-10-03
Abstract
Abstract Improvements in the positive temperature dependence of yield strength and in the work hardening rate of tri-nickel aluminide base alloys are achieved. The novel alloy composition has seven alloying ingredients as follows: ______________________________________ Concentration Ingredient in Atomic % ______________________________________ Ni balance Co 8-12 Al 16-20 Si 4-6 Nb 0.26-0.30 Zr 0.02-0.04 B 0.2-0.7 ______________________________________ The novel composition may be prepared by forming a melt of the composition and atomizing the melt with an inert gas to form fine particles with Ll 2 type crystal structure. The powder is densified by heat and pressure to a novel alloy composition having the improvements in positive temperature dependence of yield strength and work hardening rate as noted above.
Inventors
- 👤 Keh-Minn Chang
- 👤 Alan I. Taub
- 👤 Shyh-Chin Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:04
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/007
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
46 words
A tri-nickel aluminide with the following approximate alloy content: ______________________________________
Ingredient Atomic Percent
______________________________________
Ni balance
Co 8-12
Al 16-20
Si 4-6
Nb 0.26-0.30
Zr 0.02-0.04
B 0.2-0.7
______________________________________ said alloy being rapidly solidified and having a L1 2 crystal structure and being predominantly single phase.
Claim 2
Dependent Claim
46 words
A tri-nickel aluminide with the following approximate alloy content: ______________________________________
Ingredient Atomic Percent
______________________________________
Ni balance
Co 8-12
Al 16-20
Si 4-6
Nb 0.26-0.30
Zr 0.02-0.04
B 0.2-0.7
______________________________________ said alloy being rapidly solidified and having a L1 2 crystal structure and being predominantly single phase.
Claim 3
Dependent Claim
12 words
The alloy of claim 1 in the form of a fine powder.
Claim 4
Dependent Claim
13 words
The alloy of claim 1 is in a form consolidated from fine powder.
Claim 5
Dependent Claim
23 words
The alloy of claim 3 wherein the consolidation is at about 1000° to 1200° C. for a time of more than one hour.
Claim 6
Dependent Claim
13 words
The alloy of claim 3 in which the consolidated form is work hardened.
Claim 7
Dependent Claim
18 words
The alloy of claim 3 in which the consolidated form is work hardened by greater than about 20%.
Claim 8
Dependent Claim
65 words
A composition with improved work hardening properties which comprises a rapidly solidified boron doped tri-nickel aluminide having a L1 2 type crystal structure having substituents in place of a portion of the nickel and in place of a portion of the aluminum as follows: ______________________________________
Ingredient Approximate Atomic Concentration
______________________________________
Nickel balance
Cobalt 10.01
Aluminum 18.54
Silicon 5.02
Niobium 0.28
Zirconium 0.03
Boron 0.24.
______________________________________
Claim 9
Dependent Claim
65 words
A composition with improved work hardening properties which comprises a rapidly solidified boron doped tri-nickel aluminide having a L1 2 type crystal structure having substituents in place of a portion of the nickel and in place of a portion of the aluminum as follows: ______________________________________
Ingredient Approximate Atomic Concentration
______________________________________
Nickel balance
Cobalt 10.01
Aluminum 18.54
Silicon 5.02
Niobium 0.28
Zirconium 0.03
Boron 0.24.
______________________________________
Claim 10
Dependent Claim
10 words
The composition of claim 7 rapidly solidified in powder form.
Claim 11
Dependent Claim
31 words
The composition of claim 7 consolidated from the as cast form by high temperature isostatic pressing at about 15 ksi for at least 1 hour at about 1000° to 1200° C.
Claim 12
Dependent Claim
9 words
The composition of claim 9 work hardened by straining.
Claim 13
Dependent Claim
21 words
The composition of claim 9 work hardened by straining greater than about 20% and having a strength of over 200 ksi.
Claim 14
Independent Claim
67 words
The method of preparing a tri-nickel aluminide base alloy having a high rate of work hardening which comprises, preparing an alloy of the following composition ______________________________________
Ingredient Atomic Percent
______________________________________
Ni balance
Co 8-12
Al 16-20
Si 4-6
Nb 0.26-0.30
Zr 0.02-0.04
B 0.2-0.7
______________________________________ preparing a melt of the alloy, atomizing the alloy to form rapidly solidified powder, and consolidating the powder to a solid object.
Claim 15
Independent Claim
67 words
The method of preparing a tri-nickel aluminide base alloy having a high rate of work hardening which comprises, preparing an alloy of the following composition ______________________________________
Ingredient Atomic Percent
______________________________________
Ni balance
Co 8-12
Al 16-20
Si 4-6
Nb 0.26-0.30
Zr 0.02-0.04
B 0.2-0.7
______________________________________ preparing a melt of the alloy, atomizing the alloy to form rapidly solidified powder, and consolidating the powder to a solid object.
Claim 16
Dependent Claim
17 words
The method of claim 7 in which the strength of the object is improved by cold working.
Claim 17
Dependent Claim
12 words
The method of claim 8 in which the working is cold pressing.
Claim 18
Dependent Claim
12 words
The method of claim 8 in which the working is cold rolling.
Claim 19
Dependent Claim
21 words
The method of claim 7 in which the consolidation of the powder is accomplished above 15 ksi and above 1000° C.
Claim 20
Dependent Claim
23 words
The method of claim 7 in which the consolidation is accomplished above 15 ksi and above 1000° C. for at least one hour.
Claim 21
Independent Claim
70 words
The method of preparing an aluminum nitride base alloy having a high rate of work hardening which comprises preparing an alloy melt according to the following approximate concentrations: ______________________________________
Approximate Concentration
Ingredient in atom percent
______________________________________
Nickel balance
Cobalt 10.01
Aluminum 18.54
Silicon 5.02
Niobium 0.28
Zirconium 0.03
Boron 0.24
______________________________________ rapidly solidifying the melt to a powder by gas atomization, consolidating the powder to body by hot isostatic pressing.
Claim 22
Independent Claim
70 words
The method of preparing an aluminum nitride base alloy having a high rate of work hardening which comprises preparing an alloy melt according to the following approximate concentrations: ______________________________________
Approximate Concentration
Ingredient in atom percent
______________________________________
Nickel balance
Cobalt 10.01
Aluminum 18.54
Silicon 5.02
Niobium 0.28
Zirconium 0.03
Boron 0.24
______________________________________ rapidly solidifying the melt to a powder by gas atomization, consolidating the powder to body by hot isostatic pressing.
Claim 23
Dependent Claim
24 words
The method of claim 18 in which the consolidated powder has a yield strength of greater than about 135 ksi at about 600° C.
Claim 24
Dependent Claim
23 words
The method of claim 18 in which the consolidated powder exhibits a strength of over 200 ksi after cold work at least 20%.
References Cited (Backward Citations)
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US3922168A
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US4478791A
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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) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |