Abstract: A method for protecting an article from a high temperature, oxidative environment is presented, along with alloy compositions and ion plasma deposition targets suitable for use in the method. The method comprises providing a substrate, providing an ion plasma deposition target, and depositing a protective coating onto the substrate using the target in an ion plasma deposition process. The target comprises from about 2 atom percent to about 25 atom percent chromium, and the balance comprises aluminum.

Abstract: The invention relates to an aluminum alloy, to a plain bearing and to a method of manufacturing a layer, particularly for a plain bearing, to which there is added as a main alloy component tin (14) and a hard material (15) from at least one first element group containing iron, manganese, nickel, chromium, cobalt, copper or platinum, magnesium, or antimony. Added to the aluminum alloy from the first elementary group is a quantity of elements for forming inter-metallic phases, e.g. aluminide formation, in the boundary areas of the matrix, and further at least one further element from a second element group containing manganese, antimony, chromium, tungsten, niobium, vanadium, cobalt, silver, molybdenum of zirconium, for substituting a portion at least of a hard material of the first element group in order to form approximately spherical or cuboid aluminides (7).

Abstract: The metal alloy based on aluminium and titanium includes an aluminium content between 80 and 90 atomic percent and a titanium content between 10 and 20 atomic percent. The alloy is microcrystalline and outside thermodynamic equilibrium, the alloy is thereby resistant to oxidation and corrosion and has at the same time remarkable adhesion to polymer materials. The metal alloy can be in the form of a reflecting coating of a thickness ranging between 0.01 and 3 &mgr;m, covered with a protective film of a polymer material. A mirror having specular reflectivity not less than about 65%, good resistance to corrosion and oxidation includes a substrate of a polymer material supporting the reflecting coating.

Abstract: The invention relates to a method for producing a grain refiner on the basis of an aluminum-titanium-boron prealloy. According to the inventive method, starting materials that contain Ti and B are introduced into an aluminum melt while TiB2 particles are formed, and the prealloy melt produced is allowed to solidify. The prealloy is set in motion at a temperature between the liquidus temperature (TLAl3Ti) of the Al3Ti phase and the solidus temperature (TSV) of the prealloy for a period (&Dgr;td) sufficient to disperse the TiB2 particles in the melt. The melt is simultaneously cooled off at a first rate of cooling (v1) so that the TiB2 particles function as the nuclei for the Al3Ti phase that is formed below the liquidus temperature (TLAl3Ti) and the surface of the TiB2 particles is at least partially covered by an Al3Ti coating.

Abstract: An aluminum alloy material for use in a terminal, which material contains a crystalline structure having 30% or more of a space factor of crystal grains having a crystal grain size of 30 &mgr;m or less. A terminal containing the aluminum alloy material.

Abstract: A master alloy for modification and grain refining of hypoeutectic and eutectic Al—Si based foundry alloys is described. In addition to unavoidable contaminants the alloy contains nucleating and modifying additions of Ti, B and Sr, wherein the content of Ti is between 0.5 and 2.0% by weight, the content of B is between 0.5 and 2.0% by weight and the content of Sr is between 3.0 and 12.0% by weight, with the ratio Ti/B between 0.8 and 1.4. A method for the preparation of said master alloy is also described.

Abstract: The invention relates to an aluminium alloy, in particular for a layer of a friction bearing, for example, which, apart from aluminium and smelt-related impurities, additionally contains soft-phase formers, e.g. Sn, Pb, Bi, Sb or similar. The alloy contains added quantities of at least one element from the group of elements consisting of Sc, Y, Hf, Nb, Ta, La, lanthanides and actinides in a maximum of 10% by weight, preferably 4% by weight, in particular between 0.015% by weight and 3.25% by weight, relative to 100% by weight of alloy, the remainder being aluminium with smelt-related impurities.

Abstract: A liquid reactant metal alloy includes at least one chemically active metal for reacting with non-radioactive material in a mixed waste stream being treated. The reactant alloy also includes at least one radiation absorbing metal. Radioactive isotopes in the waste stream alloy with, or disperse in, the chemically active and radiation absorbing metals such that the radiation absorbing metals are able to absorb a significant portion of the radioactive emissions associated with the isotopes. Non-radioactive constituents in the waste material are broken down into harmless and useful constituents, leaving the alloyed radioactive isotopes in the liquid reactant alloy. The reactant alloy may then be cooled to form one or more ingots in which the radioactive isotopes are effectively isolated and surrounded by the radiation absorbing metals. These ingots comprise the storage products for the radioactive isotopes. The ingots may be encapsulated in one or more layers of radiation absorbing material and then stored.

Abstract: An oxidation-resistant coating is described, formed of an alloy containing: about 40 to about 50 atom % aluminum and about 0.5 atom % to about 3 atom % tantalum; with a balance of nickel; cobalt, iron, or combinations thereof. The coating may also include chromium and a precious metal, as well as other components, such as zirconium or molybdenum. A method for applying the oxidation-resistant coating to a substrate is also described. The substrate can be formed of superalloy material, e.g., a turbine engine component. Related articles are also disclosed.

Abstract: A core material of an aluminum brazing sheet restricts Mg to less than 0.3 wt % and Fe to not more than 0.2 wt %, and contains more than 0.2 wt % and not more than 1.0 wt % of Cu, 0.3 to 1.3 wt % of Si, 0.3 to 1.5 wt % of Mn and the balance of Al and inevitable impurities. A brazing filler material is formed on one surface of the core material by Al—Si based aluminum alloy. Also, a cladding material is formed on the other surface of the core material, and contains less than 0.2 wt % of Si, 2.0 to 3.5 wt % of Mg, not less than 0.5 wt % and less than 2.0 wt % of Zn and the balance of Al and inevitable impurities. Further, the value (cladding material hardness)/(the core material hardness) that is a ratio of the hardness of the cladding material to the hardness of the core material is not more than 1.5.

Abstract: The present invention provides an Al alloy thin film for a semiconductor device electrode having an electrical resistivity of as low as 6 &mgr;&OHgr;cm or less, high hillock resistance, high void resistance, and high corrosion resistance against an alkaline solution, which are required for an electrode thin film of large-screen liquid crystal display (LCD) or high-resolution LCD. The present invention also provides a sputtering target to deposit the Al alloy film by sputtering process for a semiconductor device electrode. The Al alloy thin film for a semiconductor device electrode satisfies the conditions of Y≧0.3 at %, IVa group metal element≧0.2 at %, and 0.3Cy+3CIVa≦2 (wherein Cy: Y content (at %), CIVa: content of IVa group metal element (at %)), and the sputtering target is made of an Al alloy satisfying the above conditions.

Abstract: The invention relates to a brazing sheet with a two-layer structure or a three-layer structure, having a core sheet made of an aluminium alloy core material and on one side or both sides thereof a brazing layer of an aluminium alloy containing silicon as main alloying element, wherein the aluminium alloy of the core sheet has the composition (in weight %) Mn 0.5 to 1.5 Cu 0.5 to 2.0 Si 0.3 to 1.5 Mg <0.05 Fe <0.4 Ti <0.15 Cr <0.35 Zr and/or V <0.35 in total Zn <0.25 balance aluminium and unavoidable impurities, and wherein said brazing sheet has a post-braze 0.2% yield strength of at least 50 MPa and having a corrosion life of more than 12 days in a SWAAT test without perforations in accordance with ASTM G-85, and further to a method of its manufacture.

Abstract: The first Al-based target material for sputtering contains 0.01-10 atomic % of at least one intermetallic compound-forming element, and an intermetallic compound having a maximum diameter of substantially 50 &mgr;m or less. The second Al-based target material for sputtering has a microstructure comprising an alloy phase containing 20 atomic % or less of the intermetallic compound-forming element and Al and an Al matrix phase comprising substantially pure Al, the maximum diameter of the intermetallic compound in the alloy phase being substantially 50 &mgr;m or less. The content of the intermetallic compound forming element based on the whole structure is 0.01-10 atomic %. These target materials are produced by pressure-sintering a rapid solidification powder at 400-600° C. After the pressure sintering, the target material is preferably hot-rolled at 400-600° C.

Abstract: An aluminium alloy for use as a core material in brazing sheet, comprising, in weight %: Mn 0.7-1.5, Cu 0.6-1.0, Fe not more than 0.4, Si less than 0.1, Mg 0.05-0.8, Ti 0.02-0.3, Cr 0.1-0.25, Zr 0.1-0.2, balance Al and unavoidable impurities, wherein 0.20<(Cr+Zr)≦0.4, the alloy being capable of obtaining in the post-brazing state 0.2% yield strength of at least 65 MPa and having a corrosion life of more than 11 days in a SWAAT test without perforations in accordance with ASTM G-85.

Abstract: Aluminum alloy products are described which combine both good strength and resistance to pitting corrosion. They are extruded from an aluminum alloy of the AA1000, AA3000 or AA8000 series containing about 0.001 to 0.3% zinc and about 0.001 to 0.03% titanium. The alloy may also contain 0.001 to 0.5% manganese and about 0.03 to 0.4% silicon. These products are particularly useful in the production of extruded products, such as heat exchanger tubing.

Abstract: An aluminium alloy for use as a core material in brazing sheet, consisting of, in weight %: Mn 0.7-1.5, Cu 0.6-1.0, Fe not more than 0.4, Si less than 0.1, Mg 0.05-0.8, Ti 0.02-0.3, Cr 0.1-0.25, Zr 0.1-0.2, balance Al and unavoidable impurities, wherein 0.2≦(Cr+Zr)≦0.4, the alloy being capable of obtaining in the post-brazing state 0.2% yield strength of at least 65 MPa and having a corrosion life of more than 11 days in a SWAAT test without perforations in accordance with ASTM G-85.

Abstract: Provided is an energy absorbing member which makes it possible to induce contraction and deformation into a form of bellows, with Euler's buckle being restrained. An energy absorbing member comprises a hollow extrusion which is made of an aluminum alloy and has an outer portion and an inner rib connected to the outer portion, and the radius of the corner where the rib and the outer portion are connected to each other is not more than a half of the thickness of the rib. A similar energy absorbing member has plural inner ribs which are connected to the outer portion and cross each other, and the radius of the corner where the ribs cross each other is 1 mm or less.

Abstract: A tough and heat resisting aluminum alloy comprising aluminum, a transition metal element and a rare earth element, and having a modulated structure which comprises an aluminum matrix and an intermetallic compound precipitated to form a network in the aluminum matrix. Also disclosed in a process for producing the aluminum alloy which comprises the steps of: rapid quenching and solidifying a liquid aluminum alloy at a quenching rate of 102 to 105 K/sec to obtain an aluminum-based supersaturated solid solution; and heat treating the quenched aluminum-based supersaturated solid solution at a heat treating temperature of 473 K or higher, the temperature increasing rate to the heat treating temperature being 1.5 K/sec or higher.

Abstract: An Al alloy film containing one kind or two or more kinds of alloy components selected from a group of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and Mn in a total amount of 0.1 to 10 at %, and a melting Al alloy sputtering target for depositing the Al alloy film, wherein the above-mentioned film is used as a reflection film for an optical recording medium, a shading film for a liquid crystal display panel or for a solid image pickup device, and an Al alloy thin film line or electrode material for a semiconductor device.

Abstract: A support for a lithographic printing plate in which uniform pits are efficiently formed by electrochemically graining treatment, always independently of electrolytic conditions to give excellent printing performance, which comprises an aluminum alloy plate containing 0.05% to 0.5% by weight of Fe, 0.03% to 0.15% of Si, 0.006% to 0.03% by weight of Cu and 0.010% to 0.040% by weight of Ti, wherein the Cu concentration of a surface layer portion of from a surface to a depth of 2 &mgr;m of the aluminum alloy plate is at least 20 ppm higher than that of a region deeper than the surface layer portion.

Abstract: This invention relates to master alloy hardeners for use in preparing aluminum base alloys. The respective concentrations of the alloying elements in the master alloy hardener are a multiple equal to or greater than 2 of the concentrations of such elements in the base alloy, and the ratios of the alloying elements in the master alloy hardener to each other are the same as the ratios of the alloying elements in the base alloy. After the aluminum base alloy and the concentration of each alloying element therein are identified, a desired multiple of such concentrations is determined. An aluminum master alloy is prepared that contains the alloying elements at concentrations equivalent to such multiple of the corresponding concentrations of the elements in the base alloy. The master alloy hardeners are added to commercially pure aluminum to provide the desired base alloy.

Abstract: The invention is a method of controlling the grain refinement of certain aluminium alloys. The grain sizes for different values of the grain growth index, GGI, are determined for the used casting method. The GGI is represented by the sum of m(k-1) value multiplied with the concentration for every element in the aluminium alloy. If the value for a certain alloy is compared with known relations between the m(k-1) value and the grain size the composition of the alloy melt is amended to an optimum grain size by adding a grain size affecting agent. The method can be further improved by optimising the amount of nucleating agent.

Abstract: The methods of the present invention provide efficient mechanical milling or alloying of stock materials of titanium and aluminum in order to increase yield of the titanium stock and reduce cost in connection with the production of a titanium-aluminum-based alloy sinter. Sponge titanium, which has a particle size of 1 to 20 mm and which contains hydrogen at 3.5 mass % or more, is used as the titanium stock. The sponge titanium is ball-milled with an aluminum stock in an argon atmosphere to produce a hydrogen-containing titanium-aluminum-based alloy powder. Furthermore, this powder may be sintered, as required.

Abstract: An aluminum alloy containing dispersoid-forming elements selected from the group consisting of Zr, Mn, Cr, V, Hf, Ti, Nb, Y, Sc and combinations thereof. The improved alloy comprises the dispersoid-forming elements partially in solid solution above the saturation limit and partialy in a form of aluminide particles having an average particle size of less than 1 micron.

Abstract: A titanium aluminide based alloy consisting of 42-48 at % aluminium, 2-5 at % niobium, 3-8 at % zirconium, 0-1 at % boron, 0-0.4 at % silicon and the balance, apart from incidental impurities, is titanium. The titanium aluminize alloy composition has a satisfactory combination of high tensile strength, acceptable ductility at room temperature and low secondary creep rate at elevated temperature, so as to be suitable for use in high temperature applications for example aero-engines and automobile engines. It is suitable for compressor discs and compressor blades of aero-engines.

Abstract: A novel method for producing a ceramic phase particle dispersoid in metal and a novel product composed thereof. The method includes (a) providing a molten composition consisting essentially of molten aluminum alloy containing molten metal selected from the group consisting of Zr, V and combinations thereof, (b) providing a chloride salt containing fine carbon particles; and (c) reacting the chloride salt containing fine carbon particles in the molten aluminum metal with the molten metal to form a uniform distribution of finely sized carbide particles formed and dispersed in-situ in an aluminum alloy matrix.

Abstract: An aluminum-based alloy composition having improved combinations of corrosion resistance, drawability, bendability and extrudability consists essentially of, in weight percent, not more than about 0.03% copper, between about 0.1 and up to about 1.5% manganese, between about 0.03 and about 0.35% titanium, an amount of magnesium up to about 1.0%, less than 0.01% nickel, between about 0.06 and about 1.0% zinc, an amount of zirconium up to about 0.3%, amounts of iron and silicon up to about 0.50%, up to 0.20% chromium, with the balance aluminum and inevitable impurities. A process of making an aluminum alloy article having high corrosion resistance, drawability, bendability and hot deformability is also provided.

Abstract: An Al alloy film containing one kind or two or more kinds of alloy components selected from a group of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and Mn in a total amount of 0.1 to 10 at %, and a melting Al alloy sputtering target for depositing the Al alloy film, wherein the above-mentioned film is used as a reflection film for an optical recording medium, a shading film for a liquid crystal display panel or for a solid image pickup device, and an Al alloy thin film line or electrode material for a semiconductor device.

Abstract: An improved elastic member (24) for micromechanical devices (12). The micromechanical device (12) includes a stationary member (28) and a moving member (26) which are connected together by a elastic member (24). Because of repeated and frequent movement of the moving member (26), the elastic member (24) can become permanently flexed or deformed, resulting in poor operation of the device. Aluminum alloys are formed to include oxygen, in combination with nitrogen if desired, to obtain a film with dramatically reduced load relaxation characteristics. Oxygen is added to an Argon sputter gas during deposition, and an amorphous film is produced.

Abstract: An aluminum-chromium alloy having an atomic ratio of aluminum to chromium of from 0.2 to 10.9 and a resistivity at room temperature of at most 1 .OMEGA..multidot.cm after heat treatment in air at a temperature of 900.degree. C. for 200 hours.

Abstract: There is disclosed a high heat resistant aluminum alloy impeller, which is suitably used as an impeller, especially for a centrifugal compressor, and for the rotor and the blade of a turbo molecular pump or the scroll of a scroll compressor. Also, a method for manufacturing this aluminum alloy impeller is disclosed. The impeller is composed of an Al--Fe rapid solidification aluminum alloy, which is produced by a spray forming process for spraying a molten metal with inert gas and rapidly solidifying the metal at a cooling speed of 10.sup.2 .degree. C./sec. or higher while simultaneously deposing the metal. The rapid solidification aluminum alloy is subjected to hot extrusion processing within a temperature range of 200.degree. C. to 600.degree. C. and further subjected to hot forging.

Abstract: A high-strength and high-ductility aluminum-base alloy consisting of a composition of general formula: Al.sub.ba1 Mn.sub.a Si.sub.b or Al.sub.ba1 Mn.sub.a Si.sub.b TM.sub.c (wherein TM is one or more elements selected from the group consisting of Ti, V, Cr, Fe, Co, Ni, Cu, Y, Zr, La, Ce and Mm; and a, b and c are, in atomic percentages, 2.ltoreq.a.ltoreq.8, 0.5.ltoreq.b.ltoreq.6, 0<c.ltoreq.4, and a.gtoreq.b), wherein the alloy contains quasi-crystals. The an aluminum-base alloy have superior mechanical properties such as high hardness, high strength and high ductility.

Abstract: An aluminum-based alloy having the general formula Al.sub.100 -(a+b)Q.sub.a M.sub.b (wherein Q is V, Mo, Fe, W, Nb, and/or Pd; M is Mn, Fe, Co, Ni, and/or Cu; and a and b, representing a composition ratio in atomic percentages, satisfy the relationships 1.ltoreq.a.ltoreq.8, 0<b<5, and 3.ltoreq.a+b.ltoreq.8) having a metallographic structure comprising a quasi-crystalline phase, wherein the difference in the atomic radii between Q and M exceeds 0.01 .ANG., and said alloy does not contain rare earths, possesses high strength and high rigidity. The aluminum-based alloy is useful as a structural material for aircraft, vehicles and ships, and for engine parts; as material for sashes, roofing materials, and exterior materials for use in construction; or as materials for use in marine equipment, nuclear reactors, and the like.

Abstract: A coating for protecting titanium aluminide alloys, including the TiAl .gamma.+Ti.sub.3 Al (.alpha..sub.2) class, from oxidative attack and interstitial embrittlement at temperatures up to at least 1000.degree. C. is disclosed. This protective coating consists essentially of titanium, aluminum, and chromium in the following approximate atomic ratio:Ti(41.5-34.5)Al(49-53)Cr(9.5-12.

Abstract: A sputtering target comprising a body of metal such as aluminum and its alloy with an ultrafine grain size and small second phase. Also described is a method for making an ultra-fine grain sputtering target comprising melting, atomizing, and depositing atomized metal to form a workpiece, and fabricating the workpiece to form a sputtering target. A method is also disclosed that includes the steps of extruding a workpiece through a die having contiguous, transverse inlet and outlet channels of substantially identical cross section, and fabricating the extruded article into a sputtering target. The extrusion may be performed several times, producing grain size of still smaller size and controlled grain texture.

Abstract: An aluminum alloy sheet for printing plate contains Fe: 0.2 to 0.6 Wt %, Si: 0.03 to 0.15 Wt %, Ti: 0.005 to 0.05 Wt %, Ni: 0.005 to 0.20 Wt %, and remainder of Al and inevitable impurity, wherein a ratio of Ni content and Si content satisfies 0.1.ltoreq.Ni/Si.ltoreq.3.7. The aluminum alloy sheet is manufactured by homogenizing an aluminum alloy ingot at a temperature in a range of 500.degree. to 630.degree. C., after performing hot rolling at start temperature in a range of 400.degree. to 450.degree. C., providing cold rolling and intermediate annealing, and further performing final cold rolling. By this, the aluminum alloy sheet for printing plate is prevented from pit generation upon dipping in electrolytic solution in a condition where an electric power is not applied. Uniformity of grained surface of the aluminum alloy sheet by electrolytic treatment can be improved.

Abstract: A diffusion barrier to help protect titanium aluminide alloys, including the coated alloys of the TiAl.gamma.+Ti.sub.3 Al (.alpha..sub.2) class, from oxidative attack and interstitial embrittlement at temperatures up to at least 1000.degree. C. is disclosed. The coating may comprise FeCrAlX alloys. The diffusion barrier comprises titanium, aluminum, and iron in the following approximate atomic percent:Ti-(50-55)Al-(9-20)Fe.This alloy is also suitable as an oxidative or structural coating for such substrates.

Abstract: An amorphous alloy which is resistant to hot corrosion in sulfidizing and oxidizing atmospheres at high temperatures, consisting of at least one element selected from the group of Al and Cr and at least one element selected from the refractory metals Mo, W, Nb, and Ta, a portion of the set forth refractory metals being allowed to be substituted with at least one element selected from Fe, Co, Ni and Cu. The addition of Si further improves the alloy's oxidation resistance.

Abstract: A high-strength and high-toughness aluminum-based alloy having a composition represented by the general formula: Al.sub.a Ni.sub.b X.sub.c M.sub.d Q.sub.e, wherein X is at least one element selected from the group consisting of La, Ce, Mm, Ti and Zr; M is at least one element selected from the group consisting of V, Cr, Mn, Fe, Co, Y, Nb, Mo, Hf, Ta and W; Q is at least one element selected from the group consisting of Mg, Si, Cu and Zn; and a, b, c, d and e are, in atomic percentage, 83.ltoreq.a.ltoreq.94,3, 5.ltoreq.b.ltoreq.10, 0.5.ltoreq.c.ltoreq.3, 0.1.ltoreq.d.ltoreq.2, and 0.1.ltoreq.e.ltoreq.2. The aluminum-based alloy has a high strength and an excellent toughness and can maintain the excellent characteristics provided by a quench solidification process even when subjected to thermal influence at the time of working. In addition, it can provide an alloy material having a high specific strength by virtue of minimized amounts of elements having a high specific gravity to be added to the alloy.

Abstract: Disclosed is a practical aluminum-based alloy containing 1 to 99 weight percent beryllium and improved methods for the investment casting of net shape aluminum-beryllium alloy parts.

Abstract: An alloy of aluminum containing magnesium, silicon and optionally copper in amounts in percent by weight falling within one of the following ranges:(1) 0.4.ltoreq.Mg.ltoreq.0.8, 0.2.ltoreq.Si.ltoreq.0.5, 0.3.ltoreq.Cu.ltoreq.3.5;(2) 0.8.ltoreq.Mg.ltoreq.1.4, 0.2.ltoreq.Si.ltoreq.0.5, Cu.ltoreq.2.5; and(3) 0.4.ltoreq.Mg.ltoreq.1.0, 0.2.ltoreq.Si.ltoreq.1.4, Cu.ltoreq.2.0; said alloyhaving been formed into a sheet having properties suitable for automotive applications. The alloy may also contain at least one additional element selected from the group consisting of Fe in an amount of 0.4 percent by weight or less, Mn in an amount of 0.4 percent by weight or less, Zn in an amount of 0.3 percent by weight or less and a small amount of at least one other element, such as Cr, Ti, Zr and V.

Abstract: A method for producing aluminum matrix composites containing refractory aluminide whiskers or particulates which are formed in-situ is disclosed. Aluminum and refractory metal materials are blended in powder form and then heated to a temperature above the melting point of aluminum. A solid/liquid reaction between the molten aluminum and solid refractory metal provides a desired volume fraction of refractory aluminide reinforcement phase (in situ whiskers or particulates). Upon cooling the molten, unreacted portion of aluminum solidifies around the in situ reinforcements to create the improved composite material.

Abstract: A high strength aluminum-based alloy, which having a composition of the general formula: Al.sub.bal Q.sub.a M.sub.b X.sub.c T.sub.d, wherein Q represents at least one element selected from the group consisting of Mn, Cr, V, Mo and W; M represents at least one element selected from the group consisting of Co, Ni, Cu and Fe; X represents at least one element selected from rare earth elements including Y or Mm; T represents at least one element selected from the group consisting of Ti, Zr and Hf; and a, b, c and d represent the following atomic percentages: 1.ltoreq.a.ltoreq.7, 0>5, 0>c.ltoreq.5 and 0>d.ltoreq.2, and contains quasi-crystals in the structure thereof. The alloy of the present invention is excellent in the hardness and strength at both room temperature and a high temperature, and also in thermal resistance and ductility.

Abstract: An aluminum-based alloy composition having improved combinations of strength and fracture toughness consists essentially of 2.5-5.5 percent copper, 0.10-2.30 percent magnesium, with minor amounts of grain refining elements, dispersoid additions and impurities and the balance aluminum. The amounts of copper and magnesium are controlled such that the solid solubility limit for these elements in aluminum is not exceeded. The inventive alloy composition may also include 0.10-1.00 percent silver for improved mechanical properties. The alloys are useful as high strength, high fracture toughness components for aircraft and aerospace structural parts.

Abstract: To provide a high-strength, high-ductility cast aluminum alloy, which enables a near-net shape product to be produced by improving the casting structure of an aluminum alloy, particularly by using specific constituents and controlling the cooling rate, and a process for producing the same. The high-strength, high-ductility cast aluminum alloy of the present invention is characterized in that it has a structure comprising fine grains of .alpha.-Al, having an average grain diameter of not more than 10 .mu.m, surrounded by a network of a compound of Al-lanthanide-base metal, the .alpha.-Al grains forming a domain, that the domain comprises an aggregate of .alpha.-Al grains which have been refined, cleaved, and ordered in a single direction and that it has a composition represented by the general formula Al.sub.a Ln.sub.b M.sub.c wherein a, b, and c are, in terms of by weight, respectively 75%.ltoreq.a.ltoreq.95%, 0.5%.ltoreq.b<15%, and 0.5%.ltoreq.c<15%.

Abstract: The specification describes a ternary alloy of aluminium. The alloy described comprises from 80 to 96% by weight of aluminium and from 4 to 20% by weight of titanium and a third element selected from the group consisting of cobalt, chromium, copper, magnesium, nickel and iron. The weight ratio of titanium to ternary alloying element lies in the range from 1:1 to 6:1. The alloy can be aged at a temperature in the range from 300.degree. to 450.degree. C.

Abstract: A method is described for preparing a refined or reinforced eutectic or hyper-eutectic metal alloy, comprising: melting the eutectic or hyper-eutectic metal alloy, adding particles of non-metallic refractory material to the molten metal matrix, mixing together the molten metal alloy and the particles of refractory material, and casting the resulting mixture under conditions causing precipitation of at least one intermetallic phase from the molten metal matrix during solidification thereof such that the intermetallics formed during solidification wet and engulf said refractory particles. The added particles may be very small and serve only to refine the precipitating intermetallics in the alloy or they may be larger and serve as reinforcing particles in a composite with the alloy. The products obtained are also novel.

Abstract: A composition and method for producing a low density, high stiffness aluminum alloy which is capable of being processed into structural components having a desired combination of tensile strength, fracture toughness and ductility. The method includes the steps of forming, by spray deposition, a solid Al-Li alloy workpiece consisting essentially of the formula Al.sub.bal Li.sub.a Zr.sub.b wherein "a" ranges from greater than about 2.5 to 7 wt %, and "b" ranges from greater than about 0.13 to 0.6 wt %, the balance being aluminum, said alloy having been solidified at a cooling rate of about 10.sup.2 to 10.sup.4 K/sec. The method further includes several variations of selected thermomechanical process steps for: (1) eliminating any residual porosity which may be present in the workpiece as a result of the spray deposition step; and (2) producing components for a wide range of applications.

Abstract: Weld filler alloys comprising aluminum, copper, lithium and, optionally, silver are disclosed which possess significantly improved fabricability and weldability. The weld filler alloys are free of magnesium and can be easily drawn into weld wire that is useful for welding aluminum-base alloys. Weldments made with the filler alloys exhibit highly improved mechanical, physical and corrosion resistance properties. The weld filler alloys may be used to weld cryogenic containers for space launch vehicles and the like.

Abstract: A process for producing an aluminum-based alloy composition having improved combinations of strength and fracture toughness. The process includes casting an ingot consisting essentially of 2.5-5.5 percent copper, 0.10-2.30 percent magnesium, with minor amounts of grain refining elements, dispersoid additions and impurities and the balance aluminum. The amounts of copper and magnesium are controlled such that the solid solubility limit for these elements in aluminum is not exceeded. The alloy composition also includes 0.10-1.00 percent silver for improved mechanical properties. The ingot, in accordance with the inventive process, is homogenized and worked to produce a product. The product is solution heat treated to obtain a saturated solid solution and then aged to develop an improved combination of high strength and fracture toughness.