Nial-base composite containing high volume fraction of AlN for a

Details Nial-base composite containing high volume fraction of AlN for a Nial-base composite containing high volume fraction of AlN for a

1994-05-05

1997-06-03

Mai, Ngoclan

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75249, 419 13, 419 32, 419 33, C22C 2100, B22F 300

Patent

active

056356544

ABSTRACT:
A particulate reinforced NiAl-AlN composite alloy has a NiAl matrix and greater than about 13 volume percent fine particles of AlN within the matrix. The particles preferably have a diameter from about 15 nanometers to about 50 nanometers. The particulate reinforced NiAl-AlN composite alloy may be prepared by cryomilling prealloyed NiAl in liquid nitrogen using grinding media having a diameter of from about 2 mm to about 6 mm at an impeller speed of from about 450 RPM to about 800 RPM. The cryomilling may be done for a duration of from about 4 hours to about 20 hours to obtain a cryomilled powder. The cryomilled powder may be consolidated to form the particulate reinforced NiAl-AlN composite alloy. The particulate reinforced alloy can further include a toughening alloy. The toughening alloy may include NiCrAlY, FeCrAY and FeAl.

REFERENCES:
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Bowman, Randy et al., "Unresolved Technical Barriers to the Development of a Structurally Viable Al.sub.2 O.sub.23 /NIAL Composite," HITEMP, NASA-CP-19117, 1993.
Luton, M.J. et al., "Cryomilling of Nano-Phase Dispersion Strengthened Aluminum," Mat. Res. Soc. Symp. Proc., vol. 132, 1989, pp. 79-86.
Whittenberger, J. D. et al., "Preliminary investigation of a NiAl composite prepared by cryomilling," J. Mater. Res., vol. 5, No. 2, Feb. 1990, pp. 271-277.
Aikin, B.J.M. et al., "Reproducibility of NiAl Cryomilling," Mech. All. for Struct. App., Proc. 2nd Intl. Conf. Struct. Appl. Mech. All., Sep. 20-22 1993, pp. 283-290.
Whittenberger, J. D. et al., "1300 K compressive properties of a reaction milled NiAl-AlN composite," J. Mater. Res., vol. 5, No. 12, Dec. 1990, pp. 2819-2827.
Lowell, Carl E. et al., "Cyclic Oxidation Resistance of a Reaction Milled NiAl-AlN Composite," Mat. Res. Soc. Symp. Proc., vol. 194, 1990, pp. 355-360.
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