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Record Details

Record 34 of 6375
Eutectic superalloys strengthened by delta Ni3Cb lamellae, and gamma prime, Ni3Al precipitates.
Author and Affiliation:
Lemkey, F. D.
Thompson, E. R.(United Aircraft Research Laboratories, East Hartford, Conn., United States)
Abstract: Bivariant eutectic alloys, located on a liquidus surface within the Ni-Cb-Cr-Al quaternary, were identified which permitted the production of aligned delta Ni3Cb lamellae within a nichrome matrix containing the fcc precipitate gamma prime Ni3Al. The volume fraction of delta and gamma prime could be varied significantly by compositional changes. After directional solidification certain alloys possessed improved ductility and corrosion resistance with respect to the Ni3Al-Ni3Cb eutectic, while their values of tensile and creep strength approached or exceeded those for the Ni3Al-Ni3Cb pseudobinary system. The mechanical properties of the directionally solidified alloy, Ni-19.7 wt % Cb-6.0 wt % Cr-2.5 wt % Al, were evaluated. Its longitudinal strength in tension and creep was found to be superior to all advanced nickel base superalloys. It is thus demonstrated that useful properties for gas turbine airfoil applications can be achieved by reinforcing a strong and tough gamma nichrome matrix containing precipitated gamma prime by a strong lamellar intermetallic compound having greater strength at elevated temperature.
Publication Date: Sep 01, 1972
Document ID:
19730042043
(Acquired Dec 04, 1995)
Accession Number: 73A26845
Subject Category: MATERIALS, METALLIC
Document Type: Conference Paper
Publisher Information: United States
Meeting Information: Conference on In Situ Composites; Sept. 5-8, 1972; Lakeville, CT; US
Meeting Sponsor: National Academy of Sciences;
U.S. Navy Air Systems Command;
Office of Naval Research
Contract/Grant/Task Num: NAS3-15562
Financial Sponsor: NASA; United States
Description: 15p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: EUTECTIC ALLOYS; FACE CENTERED CUBIC LATTICES; HEAT RESISTANT ALLOYS; LIQUIDUS; METAL MATRIX COMPOSITES; NICKEL ALLOYS; PRECIPITATES; QUATERNARY ALLOYS; CONCENTRATION (COMPOSITION); CREEP STRENGTH; OXIDATION RESISTANCE; PRECIPITATION HARDENING; TENSILE STRENGTH
Imprint And Other Notes: National Academy of Sciences, U.S. Navy Air Systems Command, and Office of Naval Research, Conference on In Situ Composites, Lakeville, Conn., Sept. 5-8, 1972, Paper. 15 p.
Availability Source: Other Sources
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