United States of America As Represented by the Secretary of the Air Force

Madan G Mendiratta

Dennis M Dimiduk

P R Subramanian

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.

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

High temperature melting molybdenum-chromium-silicon alloys having good high temperature strength and specific stiffness are described which comprise Mo--Cr--Si alloys in the Mo-rich (Mo, Cr)--(Mo, Cr).sub.3 Si two-phase field.

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Beavercreek, OH, United States of America

Madan G Mendiratta