A copper-based alloy casting includes 69 to 88% of Cu, 2 to 5% of Si, 0.0005 to 0.04% of Zr, 0.01 to 0.25% of P by mass, and a remainder including Zn and inevitable impurities, and satisfies 60Cu3.5Si3P71. Further, mean grain size after melt-solidification is 100 m or less, and , and -phases occupy more than 80% of phase structure. Furthermore, the copper-based alloy casting according to the invention can further include at least one element selected from a group consisting of 0.001 to 0.2% of Mg, 0.003 to 0.1% of B, 0.0002 to 0.01% of C, 0.001 to 0.2% of Ti and 0.01 to 0.3% of rare earth element.

Hardened cobalt alloys for forming jewelry, including finger rings as well as methods and processes for producing such alloys. In one illustrative embodiment, such an alloy can contain cobalt in an amount of from about 35 wt % to about 65 wt %, in combination with chromium in an amount of from about 16% wt to about 32 wt %, and molybdenum in an amount of from about 8 wt % to about 31 wt %. Aluminum, silicon, boron, titanium, and other hardness enhancing materials may also be present. Hot investment casting may be used to form items from the alloys, which may then be shaped or polished to a final form. Annular finger rings constructed from these materials may have a white appearance similar to white gold or platinum, may have increased resistance to scratching compared to traditional cobalt chromium rings, and may be easily be removed by cracking in an emergency situation.

A method of producing an article selected from a titanium article and a titanium alloy article comprises melting feed materials with a source of hydrogen to form a molten heat of titanium or a titanium alloy, and casting at least a portion of the molten heat to form a hydrogenated titanium or titanium alloy ingot. The hydrogenated ingot is deformed at an elevated temperature to form a worked article comprising a cross-sectional area smaller than a cross-sectional area of the hydrogenated ingot. The worked article is dehydrogenated to reduce a hydrogen content of the worked article. In certain non-limiting embodiments of the method, the dehydrogenated article comprises an average -phase particle size of less than 10 microns in the longest dimension.

An amorphous alloy and a method for preparing the amorphous alloy are provided. The amorphous alloy is represented by a formula of (Zr,Hf).sub.aM.sub.bN.sub.cBe.sub.d. M contains at least one element selected from transition group elements. N contains at least one selected from Al and Ti. And 40a70, 10b40, 5c20, 5d25, and a+b+c+d=100. The ratio of an atomic percentage of Hf to an atomic percentage of Zr is in a range of about 0.01 to about 5.

A machine for forming metal bars, in particular for producing ingots made of precious metal such as gold, silver, precious alloys, as well as other pure metals or different alloys, in the form of solid metal powder, grits or swarf of various sizes, having an ingot mold and a cover for closing the ingot mold when filled, the ingot mold has a dimension in height such that the cover passes from a first position to a second position when the volume occupied by the mass of metal that fills the ingot mold reduces gradually up to one third of the initial solid volume. In the first position the cover rests on the metal that fills the ingot mold and remains raised with respect to an abutting edge of the ingot mold, in such a manner that the bottom of the cover compresses and thus uniformly compacts the powders, the grits or the swarf so that, during the melting step, in the second position, the cover lowers progressively as the metal melts, until it rests on the abutting edge of the ingot mold, thus hermetically closing the ingot mold.

A method of forming a component having an internal passage defined therein is provided. The method includes positioning a jacketed core with respect to a mold. The jacketed core includes a hollow structure formed at least partially by an additive manufacturing process, and an inner core disposed within the hollow structure. The method also includes introducing a component material in a molten state into a cavity of the mold, and cooling the component material in the cavity to form the component. The inner core is positioned to define the internal passage within the component.

The present invention relates to a TiAl alloy for use at high temperatures having the main constituents titanium and aluminum and having a proportion of aluminum of greater than or equal to 30 at. % and a matrix composed of phase and precipitates of phase embedded in the matrix, with the phase and the phase together making up at least 55% by volume of the microstructure, and also a process for the production thereof and the use thereof.

Copper alloy casting contains Cu: 58-72.5 mass %; Zr: 0.0008-0.045 mass %; P: 0.01-0.25 mass %; one or more elements selected from Pb: 0.01-4 mass %, Bi: 0.01-3 mass %, Se: 0.03-1 mass %, and Te: 0.05-1.2 mass %; and Zn: a remainder, wherein [Cu]3[P]+0.5([Pb]+[Bi]+[Se]+[Te])=60-90, [P]/[Zr]=0.5-120, and 0.05[]+([Pb]+[Bi]+[Se]+[Te])=0.45-4 (the content of an element a is denoted as [a] mass %; the content of phase is denoted as []% by area ratio; and an element a that is not contained is denoted as [a]=0). The total content of phase and phase is 85% or more, phase content is 25% or less by area ratio, and mean grain size in the macrostructure during melt-solidification is 250 m or less.

A method of producing an article selected from a titanium article and a titanium alloy article comprises melting feed materials with a source of hydrogen to form a molten heat of titanium or a titanium alloy, and casting at least a portion of the molten heat to form a hydrogenated titanium or titanium alloy ingot. The hydrogenated ingot is deformed at an elevated temperature to form a worked article comprising a cross-sectional area smaller than a cross-sectional area of the hydrogenated ingot. The worked article is dehydrogenated to reduce a hydrogen content of the worked article. In certain non-limiting embodiments of the method, the dehydrogenated article comprises an average -phase particle size of less than 10 microns in the longest dimension.

A machine for forming metal bars, in particular for producing ingots made of precious metal such as gold, silver, precious alloys, as well as other pure metals or different alloys, in the form of solid metal powder, grits or swarf of various sizes, having an ingot mould and a cover for closing the ingot mould when filled, the ingot mould has a dimension in height such that the cover passes from a first position to a second position when the volume occupied by the mass of metal that fills the ingot mould reduces gradually up to one third of the initial solid volume. In the first position the cover rests on the metal that fills the ingot mold and remains raised with respect to an abutting edge of the ingot mould, in such a manner that the bottom of the cover compresses and thus uniformly compacts the powders, the grits or the swarf so that, during the melting step, in the second position, the cover lowers progressively as the metal melts, until it rests on the abutting edge of the ingot mold, thus hermetically closing the ingot mould.