Abstract: Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based cladding alloy are provided. The cladding is preferably an alloy having a niobium and titanium base according to the expression:Nb.sub.balance -Ti.sub.32-48 -Al.sub.8-16 -Cr.sub.2-12,provided that the sum (Al+Cr).ltoreq.22 a/o, and where Ti is less than 37 a/o the sum (Al+Cr).ltoreq.16a/o.The reinforcement may be in the form of plates, sheets or rods of the higher strength, higher temperature niobium based reinforcing alloy. The same crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.

Abstract: Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based cladding alloy are provided. The cladding is preferably an alloy having a niobium and titanium base according to the expression:Nb.sub.balance -Ti.sub.31-48 -Al.sub.8-21.The reinforcement may be in the form of plates, sheets or rods of the higher strength, higher temperature niobium based reinforcing alloy. The same crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.

Abstract: Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based alloy are provided. The matrix is preferably an alloy having a niobium and titanium base according to the expression:Nb.sub.balance -Ti.sub.40-48 -Al.sub.12-22 -Hf.sub.0.5-6.The reinforcement may be in the form of strands of the higher strength, higher temperature niobium based alloy. The same Crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.

Abstract: Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based cladding alloy are provided. The cladding is preferably an alloy having a niobium and titanium base according to the expression:Nb balance-Ti32-45-Al-3-18-Hf-8-15.The reinforcement may be in the form of plates, sheets or rods of the higher strength, higher temperature niobium based reinforcing alloy. The same crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.

Abstract: Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based alloy are provided. The matrix is preferably an alloy having a niobium and titanium base according to the expression:Nb--Ti.sub.27-40.5 --Al.sub.4.5-10.5 --Hf.sub.1.5-5.5 Cr.sub.4.5-8.5 V.sub.0-6,where each metal of the metal/metal composite has a body centered cubic crystal structure, andwherein the ratio of concentrations of Ti to Nb (Ti/Nb) is greater than or equal (.gtoreq.) to 0.5, andwherein the maximum concentration of the Hf+V+Al+Cr additives is less than or equal (.ltoreq.) to the expression:16.5+(5.times.Ti/Nb),and the reinforcement may be in the form of strands of the higher strength, higher temperature niobium based alloy. The same crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.

Abstract: Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based alloy are provided. The matrix is preferably an alloy having a niobium and titanium base according to the expression:Nb.sub.balance -Ti.sub.32-48 -Al.sub.8-16 -Cr.sub.2-12.The reinforcement may be in the form Of strands of the higher strength, higher temperature niobium based alloy. The same crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.

Abstract: Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based alloy are provided. The matrix is preferably an alloy having a niobium and titanium base according to the expression:Nb--Ti.sub.32-45 --Al.sub.3-18 --Hf.sub.8-15and the reinforcement may be in the form of strands of the higher strength, higher temperature niobium based alloy. The same crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.

Abstract: Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based cladding alloy are provided. The cladding is preferably an alloy having a niobium and titanium base according to the expression:Nb.sub.balance -Ti.sub.27-40.5 -Al.sub.4.5-10.5 -Hf.sub.1.5-5.5 V.sub.0-6 Cr.sub.4.5-8.5 Zr.sub.0-1 C.sub.0-0.5,where each metal of the metal/metal composite has a body centered cubic crystal structure, andwherein the ratio of concentrations of Ti to Nb (Ti/Nb) is greater than or equal (.gtoreq.) to 0.5, andwherein the maximum concentration of the Hf+V+Al+Cr additives is less than or equal (.ltoreq.) to the expression:16.5+5.times.Ti/Nb.The reinforcement may be in the form of plates, sheets or rods of the higher strength, higher temperature niobium based reinforcing alloy. The same crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.

Abstract: Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based alloy are provided. The matrix is preferably an alloy having a niobium and titanium base according to the expression:Nb.sub.balance --Ti.sub.31-48 --Al.sub.8-21.The reinforcement may be in the form of strands of the higher strength, higher temperature niobium based alloy. The same crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.

Abstract: Composite structures having a higher density, stronger reinforcing niobium based alloy embedded within a lower density, lower strength niobium based alloy are provided. The matrix is preferably an alloy having a niobium and titanium base according to the expression:Nb-Ti.sub.35-45- Hf.sub.10-15,and the reinforcement may be in the form of strands of the higher strength, higher temperature niobium based alloy. The same crystal form is present in both the matrix and the reinforcement and is specifically body centered cubic crystal form.

Abstract: A high performance x-ray tube rotating target having a reactive barier layer between the substrate and the emissive coating and, if desired, a protective layer of molybdenum between the reactive barrier and the emissive coating is disclosed.

Abstract: There is provided by the present invention an alloy which is mechanically and chemically compatible with advanced nickel-base superalloys and nickel-base eutectic superalloys and which possesses excellent resistance to high temperature oxidation. The alloy of the invention is, therefore, particularly useful as a protective environmental coating for the external surfaces of hot-stage aircraft gas turbine engine components, e.g., rotating blades and stationary vanes, made from such advanced superalloys.

Abstract: An alloy is provided which has good operating strength and ductility at temperatures of 2000.degree. to 2500.degree. F. and density of between 7.0 and 7.3. The alloy contains niobium titanium and hafnium in concentrations as set forth below:______________________________________ Concentration in Atom % Ingredient From To ______________________________________ Niobium balance essentially Titanium 35 45 Hafnium 10 15.

Abstract: An alloy is provided for use at high temperature. The alloy is a niobium-titanium base alloy and has the following approximate composition.______________________________________ Concentration in atomic percent Ingredient From About To About ______________________________________ Nb balance essentially Ti 31 48 Al 8 21.

Abstract: An alloy having high strength at high temperature is provided. The alloy has the following approximate composition in atom percent:______________________________________ niobium balance titanium 40-48% aluminum 12-22% hafnium 0.

Abstract: An alloy is provided having exceptional strength at very high temperatures of 1200.degree. C. and higher.

Abstract: An alloy having a niobium titanium base and aluminum and chromium additives is provided. The alloy has superior strength and ductility at high temperatures.

Abstract: A substantial gain in the properties of conventional FeCrAlY is achieved by adding RuAl to a melt of the conventional material. The resultant composition has a use temperature above the melting point of nickel base superalloys and has good strength and ductility properties to permit its use as a high temperature structural material.

Abstract: Alloy compositions suitable for use in protecting refractory base alloy compositions are disclosed. The coating is formed of an alloy containing chromium, ruthenium and aluminum and which may contain iron, cobalt and nickel. The coating is found to be highly resistant to oxidation.

Abstract: An alloy is provided which has good operating strength and ductility at temperatures of 2000.degree. to 2500.degree. F. and density of between 6.5 and 7.0 g/cm.sup.3.