Abstract: The present invention provides an alloy having improved crack growth inhibition and having high strength at high temperatures. The composition of the alloy is essentially as follows:______________________________________ Ingredient Concentration in Weight % ______________________________________ Ni balance Co 13 Cr 16 Mo 4 Al 2.55 Ti 4.5 Ta 3.0 Nb 1.5 Zr 0.03 C 0.03 B 0.

Abstract: The present invention provides an alloy having improved crack growth inhibition and having high strength at high temperatures. The composition of the alloy is essentially as follows:______________________________________ Concentration in Weight % Claimed Composition Ingredient From To ______________________________________ Ni balance Co 4 12 Cr 7 13 Mo 2 6 Al 3.0 6.0 Ti 3.5 5.0 Ta 2.0 4.0 Nb 1.0 3.0 Re 0.0 3.0 Hf 0.0 0.75 Zr 0.0 0.10 V 0.0 3.0 C 0.0 0.20 B 0.0 0.10 W 0.0 1.0 Y 0.0 0.10.

Abstract: The present invention provides an alloy having improved crack growth inhibition and having high strength at high temperatures. The composition of the alloy is essentially as follows:______________________________________ Ingredient Concentration in Weight % ______________________________________ Ni balance Co 15 Cr 10 Mo 3 Al 4.9 Ti 2.0 Ta 4.7 Nb 2.3 Zr 0.06 V 1 C 0.05 B 0.

Abstract: The present invention provides an alloy having improved crack growth inhibition and having high strength at high temperatures. The composition of the alloy is essentially as follows:______________________________________ Concentration in weight % Ingredient From To ______________________________________ Ni balance Co 3 13 Cr 10 16 Mo 2.5 5.5 Al 2.5 4.5 Ti 1.5 3.5 Ta 2 5 Nb 2 5 Zr 0 0.1 C 0 0.1 B 0.01 0.05 W 0 1 Re 0 3 Y 0 0.2.

Abstract: The present invention provides an alloy having improved crack growth inhibition and having high strength at high temperatures. The composition of the alloy is essentially as follows:______________________________________ Ingredient Concentration in Weight % ______________________________________ Ni balance Co 15 Cr 10 Mo 3 Al 3.35 Ti 5.90 Ta 2.70 Nb 1.35 Zr 0.06 V 1 C 0.05 B 0.03.

Abstract: A method of extending the life of components of in service nuclear reactors or components of existing reactors is taught. The method involves forming a deposit on the surface coatings of metallic elements of the nuclear containment, as well as on the surfaces of encrusted internal components which are exposed to high-temperature, high-pressure water and steam. The deposit formed is a deposit of at least one member of the platinum group of metals. The deposit is formed by electroless deposition. In operation, this deposit facilitates the combination of hydrogen and oxygen to form water and thereby aids in reducing the electrochemical corrosion potential of the system to values below a critical potential that prevents stress corrosion cracking.

Abstract: The present invention provides an alloy having improved crack growth inhibition and having high strength at high temperatures. The composition of the alloy is essentially as follows:______________________________________ Ingredient Concentration in Weight % ______________________________________ Ni balance Co 10 Cr 15 Mo 4 Al 4 Ti 3.5 Ta 2.5 Nb 1.25 Zr 0.06 C 0.05 B 0.

Abstract: A method for providing improved castability in a gamma titanium aluminide is taught. The method involves adding inclusions of boron to the titanium aluminide containing chromium and tantalum. Boron additions are made in concentrations between 0.5 to 2 atomic percent. Fine gain equiaxed microstructure is formed from solidified melt. Property improvements are also achieved.

Abstract: A TiAl composition is prepared by ingot metallurgy to have higher strength and to have moderately reduced or improved ductility by altering the atomic ratio of the titanium and niobium to have what has been found to be a highly desirable effective aluminum concentration and by addition of niobium according to the approximate formula Ti.sub.48-37 Al.sub.46-49 Nb.sub.6-14.

Abstract: An alloy is disclosed which has been found to lend itself particularly well to thermomechanical processing. The alloy is strengthened by precipitates similar to those of Inconel 718 but the alloy matrix of the composition is a nickel-chromium-cobalt matrix rather than the nickel-chromium-iron matrix of the Inconel alloy. Also the alloy has grains of average diameter of 35 .mu.m or larger. The fatigue resistance, tensile strength and the rupture strength of the alloy is improved to a remarkable degree as a result of the thermomechanical processing. The thermomechanical processing is carried out below the recrystallization temperature to prevent nucleation of fine grains. The residual strains from the thermomechanical processing or cold working provides the remarkably favorable combination of alloy properties which are found.

Abstract: A composition for providing improved castability in a gamma titanium aluminide is taught. The method involves adding inclusions of boron to the titanium aluminide containing higher concentrations of niobium. Boron additions are made in concentrations between 0.5 and 2 atomic percent. Fine grain equiaxed microstructure is found from solidified melt. Property improvements are also achieved.

Abstract: A method for providing improved ductility in a castable gamma titanium aluminide is taught. The method involves adding inclusions of boron to the titanium aluminide containing higher concentrations of niobium and thermomechanically working the casting. Boron additions are made in concentrations between 0.5 and 2 atomic percent. Fine grain equiaxed microstructure is found from solidified melt. Property improvements are achieved by the thermomechanical processing.

Abstract: An alloy having a very high resistance to oxidation is taught. The alloy contains between 30 and 75 atom percent of silicon in an iridium base. The alloy may be used in the form of a surface coating to protect structural elements of other materials from oxidation. The alloy may also be used as an ingredient of a composite.

Abstract: A method for providing improved castability in a gamma titanium aluminide is taught. The method involves adding inclusions of boron to the titanium aluminide containing chromium and niobium. Boron additions are made in concentrations between 0.5 and 2 atomic percent. Fine grain equiaxed microstructure is found from solidified melt. Property improvements are also achieved.

Abstract: A method of preparing a TiAl base composition containing niobium and chromium according to the formula Ti.sub.48 Al.sub.48 Cr.sub.2 Nb.sub.2 is taught. The composition is melted and cast. It is then homogenized at temperatures up to 1400.degree. C. The cast and homogenized composition is enclosed in a restraining band, heated to forging temperature and forged. Following the forging, it is annealed and aged.

Abstract: A method for forming a preform having an inner portion of a first metal and an outer portion of a second metal is taught. The preform is fabricated by spray forming processing. The beginning stages of the spray forming is performed with a first metal in a dispensing crucible which supplies a stream of the first metal to an atomization zone where the stream is broken up into many droplets which are driven by an atomizing gas onto a receiving surface. The second stage of the processing involves adding small quantities of a second metal to the dispensing crucible before the first metal is completely drained therefrom to permit a blend of the two metals to be formed on the preform between an inner and an outer portion thereof. The third phase of the method is the addition of a second metal to the dispensing crucible so that the latter stages of the spray forming is performed with the second metal and accordingly that the outer portions of the preform are formed of the second metal.

Abstract: A method of controlling the internal dimensions of a filament reinforced ring structure is taught. The method involves providing the ring structure with an internal dimension which is slightly smaller than the specification of the final dimension which is sought. The ring structure is mounted over a solid mandrel having a coefficient of thermal expansion which is greater than that of the ring structure. The solid mandrel is mounted within the ring structure and the combination is heated to a temperature at which the outer dimension of the mandrel is greater than that of the internal dimension of the ring structure. The result is to enlarge the internal dimensions of the ring structure to a value conforming very closely to a specification for the ring structure.

Abstract: A method for controlling the dimension of a reinforced metal matrix composite structure is taught. The structure is annular and the method is to render the structure non-round where the initial structure is essentially round. The cure of the essentially round condition is accomplished by forming a solid mandril very slightly smaller in dimensions than the final dimensions sought for the structure. The essentially round composite ring is forced onto the non-round mandril and heated to the relaxation temperature of the matrix. Because the mandril has a higher thermal coefficient of expansion than the matrix, the method is effective in forming an essentially round structure into a non-round configuration.

Abstract: The present invention provides an alloy having improved crack growth inhibition and having high strength at high temperature. The composition of the alloy is essentially as follows:______________________________________ Ingredient Concentration in Weight % ______________________________________ Ni balance Co 8 Cr 13 Mo 4 Al 3.5 Ti 2.5 Ta 5.6 Nb 1.9 Zr 0.06 C 0.05 B 0.

Abstract: A TiAl composition is prepared to have high strength, high oxidation resistance and to have acceptable ductility by altering the atomic ratio of the titanium and aluminum to have what has been found to be a highly desirable effective aluminum concentration by addition of chromium and silicon according to the approximate formula Ti.sub.48 Al.sub.48 Cr.sub.2 Si.sub.2.