Abstract: The invention relates to a composite material comprising a matrix mainly constituted by an intermetallic compound of the AlNi type containing in solid solution 1.5 to 30 atom % silicon and a reinforcement formed from silicon carbide (SiC) particles dispersed in said matrix.In said material, the presence of silicon leads to a thermodynamic equilibrium system no longer evolving by SiC reinforcement/matrix chemical reaction when raised to a high temperature.This material can be prepared by conventional processes by adding the silicon to the starting material or by carrying out a limited reaction during the preparation between an AlNi matrix and the silicon carbide particles.

Abstract: A NiAl intermetallic alloy and article is provided with improved high temperature strength, particularly stress rupture strength, through the generation of a multiphase microstructure comprising a beta matrix and at least one precipitate phase. The strength properties and microstructure are the result of alloying with at least two elements selected from Ga, Hf, and optionally Ti, Zr, Ta, Nb, and V, in defined ranges. Preferred are at least two of the elements Ga, Hf, and Ti, and specifically preferred are all three. A specifically preferred form of the invention, in atomic percent, is about 45-59% Ni, about 0.02-0.5% Ga, about 0.2 to less than 1% Hf, about 0.1-10% Ti, with the balance A1 and incidental impurities.

Abstract: A Ni-Fe magnetic alloy consists essentially of:77 to 80 wt. % Ni, 3.5 to 5 wt. % Mo, 1.5 to 3 wt. % Cu, 0.1 to 1.1 wt. % Mn, 0.1 wt. % or less Cr, 0.003 wt. % or less S, 0.01 wt. % or less P, 0.005 wt. % or less 0, 0.003 wt. % or less N, 0.02 wt. % or less C, 0.001 to 0.05 wt. % Al, 1 wt. % or less Si, 2.6-6 of the weight ratio of Ca to S, (Ca/S), and the balance being Fe and inevitable impurities, satisfies an equation of 3.2.ltoreq.(2.02.times.[Ni]-11.13.times.[Mo]-1.25.times.[Cu]-5.03.times.[M n])/ (2.13.times.[Fe]).ltoreq.3.8; and has a Mo segregation ratio defined by a seregration equation satisfying 5% or less, the seregration equation being .vertline.(Mo content in a segregation region-Mo average content)/ (Mo average content).vertline..times.100%.A method for producing a magnetic Ni-Fe alloy comprises the steps of: a first heating step of heating an alloy ingot to 1200.degree. to 1300.degree. C. for 10 to 30 hrs; slabbing the heated ingot at a finishing temperature of 950.degree. C.

Abstract: To improve high-temperature strength, as well as increased resistance to wear due to sparking, a Ni-based alloy sparking plug electrode material for use in an internal combustion engine is provided. Such a Ni-based alloy sparking plug electrode material contain, by weight, from 3.1 to 4.3 of Al, from 0.5 to 1.5% of Si, from 0.45 to 0.65% of Mn, from 0.002 to 0.01% of C, from 0.005 to 0.05% of at least one of Mg and Ca, and, as necessitated, from to 2% of Cr, with the balance substantially Ni and inevitable impurities.

Abstract: A rare earth metal-nickel hydrogen occlusive alloy ingot contains 90 vol % or more of crystals having a crystal grain size of 1 to 50 .mu.m as measured along a short axis of the crystal and 1 to 100 .mu.m as measured along a long axis of the crystal. A method for producing the rare earth metal-nickel hydrogen occlusive alloy ingot involves melting a rare earth metal-nickel alloy and uniformly solidifying the alloy melt to have a thickness of 0.1 to 20 mm under cooling conditions of a cooling rate of 10.degree. to 1000.degree. C./sec and a sub-cooling degree of 10.degree. to 500.degree. C.

Abstract: Disclosed is a large alloy forging, the forging having an alloy composition selected from one of a nickel base alloy, a cobalt-chromium-nickel base alloy, a nickel-cobalt base alloy and an iron-nickel-chromium-molybdenum alloy, the forging having a grain size of ASTM grain size 3 or finer, as measured by ASTM method E112 and having a tensile strength in the range of 135 to 175 KSI.

Abstract: A process is provided for welding a gamma-prime precipitation-strengthened nickel base superalloy by heating the weld area and adjacent region to a ductile temperature, welding while maintaining the entire weld area and adjacent region at the ductile temperature and holding the weldment, weld area and adjacent region at the ductile temperature until the entire weld has solidified. The ductile temperature is above the aging temperature but below the incipient melting temperature of the superalloy.

Abstract: Disclosed is a large alloy forging and method for making it. The forging having an alloy composition selected from one of a nickel base alloy, a cobalt-chromium-nickel base alloy, a nickel-cobalt base alloy and an iron-nickel-chromium-molybdenum alloy and having a grain size of ASTM grain size 4 or finer, as measured by ASTM method E112 and having a tensile strength in the range of 135 to 175 KSI. The process includes: (1) four upset forgings, (2) a rapid cooling after the final upset cooling, (3) a first and second upset forging with a reduction greater than 50%, (4) a third upset forging with a reduction greater than 25.%, and (5) a forging process with a fourth upset forging with a reduction greater than 50%.

Abstract: Superalloy articles are made more oxidation resistant by a process which includes heating the article in an environment having a reduced pressure of inert gas and a low partial pressure of oxygen to a temperature at which the sulfur in the article diffuses out. The heat treatment is best carried out at a temperature within the range defined by the incipient melting temperature of the article and about 150.degree. C. below the incipient melting temperature of the article. Alternatively, the heat treatment may be carried out at a temperature above the gamma prime solvus temperature of the article and below the incipient melting temperature of the article. At such temperatures, sulfur readily diffuses out of the article, and a more oxidation resistant component is produced.

Abstract: A beta phase nickel aluminide microalloyed with iron having improved ductility. Nickel aluminide intermetallics alloyed with no more than about 0.5 atomic percent iron have significantly improved room temperature ductility over conventional unalloyed beta phase nickel aluminides or beta phase nickel aluminides alloyed with higher percentages of iron.

Abstract: An oxidation- and corrosion-resistant high-temperature alloy of high toughness at room temperature for directional solidification, based on an intermetallic compound of the nickel aluminide type and having the following composition:Al=10-20 atom %Si=0.5-8 atom %Nb=2-10 atom %B=0.1-2 atom %Ni=remainder,the total of Al, Si, Nb and B amounting at most to a value of 25 atom %. The alloy contains at least 90% by volume of the intermetallic phases Ni.sub.3 Al, Ni.sub.3 Si and Ni.sub.3 Nb.

Abstract: An oxidation-resistant and corrosion-resistant high-temperature alloy for directional solidification on the basis of an intermetallic compound of the nickel aluminide type having the following composition:Al=10-16 atomic %Si=0.5-8 atomic %Ta=0.5-9 atomic %Hf=0.1-2 atomic %B=0.1-2 atomic %Ni=the remainderThe alloy has at least 90% by volume of the intermetallic phases Ni.sub.3 Al, Ni.sub.3 Si and Ni.sub.3 Ta.

Abstract: A modified class of nickel aluminide (NiAl) type material is disclosed having useful amounts of toughness and ductility at low temperatures, e.g. room temperature. The basic NiAl material is modified with an additional of the material such as cobalt which produces a structure which is susceptible to undergoing a martensitic transformation. The martensitic structure when produced results in a significant increase in toughness and ductility at low temperatures.

Abstract: A melt is provided having the formula(Ni.sub.0.76 Al.sub.0.24-x Nb.sub.x).sub.89.75 Fe.sub.10 B.sub.0.25.The melt is rapidly solidified as ribbon and the ribbon is annealed at about 1100.degree. C. Desirable properties are found when x is between 0.02 and 0.10.

Abstract: A melt is provided having the formula(Ni.sub.1-x Al.sub.x).sub.99-y Fe.sub.y B.sub.1The melt is rapidly solidified as ribbon and the ribbon is annealed at about 100.degree. C. Desirable properties are found when x is between 0.21 and 0.26 and y is between 5 and 15.

Abstract: It had been found previously that tri-nickel aluminide compositions are quite sensitive to the ratio of nickel to aluminum in their ability to receive boron as a dopant. It has now been found that compositions which are relatively poor in the aluminum component can be doped more effectively with a combination of boron and zirconium. It has been found for the nickel aluminides which have lower concentrations of aluminum that the percent of zirconium and boron which can be added to the composition to effectively increase the strength of the alloys is favored by the lower aluminum ratio. The compositions which result are found to have significant strength properties not only at room temperature but at elevated temperatures based on tensile tests of the compositions.

Abstract: A tri-nickel aluminide base alloy composition is provided with a desirable combination of tensile strength and ductility. The composition is prepared to include boron dopant in combination with relatively low percentages of carbon for the high increase in strength achieved. The composition has an Ll.sub.2 of crystalline structure. It is prepared by rapid solidification at a cooling rate of at least 10.sup.3 .degree. C. per second.

Abstract: A method for achieving both improved strength and improved ductility in intermediate phases is provided. The method, briefly stated, comprises the steps of providing a melt whose composition substantially corresponds to that of a preselected intermetallic phase having a crystal structure of the Ll.sub.2 type, such as nickel alumininde, modified with from about 0.01 to 2.5 atomic percent boron, and modified further with cobalt substituent metal and rapidly solidifying the melt at a cooling rate of at least about 10.sup.3 .degree. C./second to form a solid body, the principal phase of which is of the Ll.sub.2 type crystal structure in either its ordered or disordered state.

Abstract: High modulus turbine shafts are described as are the process parameters for producing these shafts. The shafts have a high modulus as a result of having high modulus <111> crystal texture in the axial direction. The shafts are produced from a nickel base material consisting largely of the compound Ni.sub.3 Si. Hot axisymmetric deformation followed by cold axisymmetric deformation produces an intense singular <111> texture and results in shaft material whose Young's modulus is at least 25% greater than that of the steel materials used in the prior art.

Abstract: Improvements in the positive temperature dependence of yield strength and in the work hardening rate of tri-nickel aluminide base alloys are achieved. The novel alloy composition has seven alloying ingredients as follows:______________________________________ Concentration Ingredient in Atomic % ______________________________________ Ni balance Co 8-12 Al 16-20 Si 4-6 Nb 0.26-0.30 Zr 0.02-0.04 B 0.2-0.7 ______________________________________The novel composition may be prepared by forming a melt of the composition and atomizing the melt with an inert gas to form fine particles with Ll.sub.2 type crystal structure. The powder is densified by heat and pressure to a novel alloy composition having the improvements in positive temperature dependence of yield strength and work hardening rate as noted above.

Abstract: A substantial increase in strength of a boron doped nickel aluminide is achieved by employing a substituent metal in the Ni.sub.3 Al composition to replace a part of the aluminum. Vanadium and silicon are successfully substituted for a portion of the aluminum to provide a composition:(Ni.sub.0.75 Al.sub.0.20 X.sub.0.05).sub.99 B.sub.1where X is selected from the group consisting of vanadium or silicon.

Abstract: A metal body having high tensile strength and ductility at temperatures over 1000.degree. F. is provided. The body is prepared by hot isostatic pressing of powder formed by atomization of a melt of an alloy. The alloy composition base is according to the formula:(Ni.sub.1-x Al.sub.x).sub.100-y B.sub.ywhere x is between 0.23 and 0.25, and where y is 0.1 to 2.0.The consolidated body is suitable for machining and may be annealed for a couple of hours at temperatures between 800.degree. C. and 1200.degree. C. following such machining.

Abstract: It has been found that tri-nickel aluminide compositions are quite sensitive to the ratio of nickel to aluminum in their ability to receive boron as a dopant and that compositions which are relatively poor in the aluminum component can be doped more effectively with boron. Further, it has been found for the nickel aluminides which have lower concentrations of aluminum that the percentage of boron which can be added to the composition to effectively increase the strength of the alloys is favored by the lower aluminum ratio so that higher concentrations of boron are addable. The compositions which result have significant strength properties based on tensile tests of the compositions.

Abstract: Ni-based alloys comprising 8 to 34 atom % of Al, 2 to 70 atom % of one or more elements selected from the group consisting of Fe, Co, Mn, and Si (providing that each or total of Fe and Co is present in an amount of 2 to 70 atom % and/or each or total of Mn and Si is present in an amount of 2 to 25 atom %), and the balance to make up to 100 atom % of substantially pure Ni, and possessing great strength and high ductility.These alloys enjoy outstanding ductility and strength and, therefore, are ideally useful for various filter materials and composite materials.

Abstract: Improvements in the strength of atomized and consolidated boron doped tri-nickel aluminides are made possible. The improved strength is achieved by cold rolling and annealing a HIPped aluminide. The improvements are to room temperature properties.

Abstract: A tri-nickel aluminide base composition is provided which has good ductility at all temperatures. The composition has a relatively high concentration of cobalt substituent and is doped by boron. It also has minor concentrations of at least two other substituent metals selected from the group consisting of niobium, hafnium, vanadium, molybdenum and zirconium.

Abstract: Zirconium is added to a Ni-30 Al (Beta) intermetallic alloy in the range of 0.05 w/o to 0.25 w/o. This addition is made during melting or by using metal powders. The addition of zirconium improves the cyclic oxidation resistance of the alloy at temperatures above 1100.degree. C.

Abstract: A method is taught for rendering a boron-doped tri-nickel aluminide resistant to mechanical failure while at intermediate temperatures of 600.degree. C. to 800.degree. C. due to a hot-short phenomena. The method involves incorporating between 0.05 and 0.30 of cobalt in the composition according to the expression(Ni.sub.1-x-z Co.sub.x Al.sub.z).sub.100-y B.sub.y.The concentration of aluminum, z, is between 0.23 and 0.25 and the concentration of boron, y, is between 0.2 and 1.50 atomic percent. The composition is formed into a melt and the melt is rapidly solidified by atomization and consolidated. The consolidation may be simultaneous with the rapid solidification, as in spray forming, or sequential by atomization to a powder and consolidation of the powder by HIPping. The consolidated body is cold worked to increase the resistance of the body to failure at intermediate temperatures and may be annealed following the cold working.

Abstract: Inhibition of grain size growth in a tri-nickel aluminide is achieved by additions of minor amounts of a metal selected from the group comprising rhenium and molybdenum.

Abstract: High modulus turbine shafts are described as are the process parameters for producing these shafts. The shafts have a high modulus as a result of having high <111> texture in the axial direction. The shafts are produced from a nickel base material having a strengthening phase and a moderate to high stacking fault energy. A combination of hot axisymmetric deformation followed by cold axisymmetric deformation produces an intense singular <111> texture and results in shaft material whose modulus is on the order of 25% greater than that of the steel materials used in the prior art.

Abstract: A method for achieving both improved high strength and improved ductility in intermediate phases is provided. The method, briefly stated, comprises the steps of providing a melt whose composition substantially corresponds to that of a preselected intermetallic phase having a crystal structure of the L1.sub.2 type, such as nickel aluminide, modified with from about 0.01 to 2.5 atomic percent boron, and rapidly solidifying the melt at a cooling rate of at least about 10.sup.3 .degree. C./second to form a solid body, the principal phase of which is of the L1.sub.2 type crystal structure in either its ordered or disordered state.