High temperature melting niobium-titanium-chromium-aluminum-sili

Metal treatment – Stock – Vanadium – niobum – or tantalum base

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420426, C22C 2702

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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:
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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).

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