Metal treatment – Stock – Vanadium – niobum – or tantalum base
Patent
1996-05-09
1998-04-21
Sheehan, John
Metal treatment
Stock
Vanadium, niobum, or tantalum base
420426, C22C 2702
Patent
active
057413762
ABSTRACT:
High temperature melting niobium-titanium-chromium-aluminum-silicon alloys having a wide range of desirable microstructures, excellent microstructural and morphological properties, superior oxidation resistance at temperatures from 1000.degree. C. to 1500.degree. C., and good low temperature toughness and good high temperature strength and creep resistance are described which comprise generally two- or three-or four-phase alloys systems having compositions (31-41)Nb-(26-34)Ti-(8-10)Cr-(6-12)Al-(9-18)Si. Two-phase beta+Nb.sub.5 Si.sub.3 -base alloys can be obtained by increasing the Nb/Ti ratio, while three-phase beta+Nb.sub.5 Si.sub.3 -base+Ti.sub.5 Si.sub.3 -base alloys or four-phase beta+Nb.sub.5 Si.sub.3 -base+Ti.sub.5 Si.sub.3 -base +Ti.sub.3 Si-base alloys can be obtained by decreasing the Nb/Ti ratio.
REFERENCES:
patent: 2822268 (1958-02-01), Hix
patent: 3753699 (1973-08-01), Anderson et al.
patent: 4983358 (1991-01-01), Hebsur et al.
patent: 4990308 (1991-02-01), Jackson
patent: 5366565 (1994-11-01), Jackson
Subramanian et al., "The Development of Nb-based Advanced Intermetallic Alloys for Structural Applications," J. Metals, 48(1), pp. 33-36 (Jan. 1996).
Dimiduk Dennis M.
Mendiratta Madan G.
Subramanian P. R.
Kundert Thomas L.
Scearce Bobby D.
Sheehan John
The United States of America as Represented by the Secretary of
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