A powder has the contents (in wt. %): C max. 0.5%, S max. 0.15%, in particular max. 0.03%, N max. 0.25%, Cr 14-35%, in particular 17-28%, Ni radical (>38%), Mn max. 4%, Si max. 1.5%, Mo >0-22%, Ti <4%, in particular <3.25%, Nb up to 6.0%, Cu up to 3%, in particular up to 0.5%, Fe <50%, P max. 0.05%, in particular max. 0.04%, Al up to 3.15%, in particular up to 2.5%, Mg max. 0.015%, V max. 0.6%, Zr max. 0.12%, in particular max. 0.1%, W up to 4.5%, in particular up to max. 3%, Co up to 28%, B<0.125%, O>0.00001-0.1% and impurities due to production, wherein Ni+Fe+Co represents 56-80% Nb+Ta<6.0%.

A powder has the contents (in wt. %): C max. 0.5%, S max. 0.15%, in particular max. 0.03%, N max. 0.25%, Cr 14-35%, in particular 17-28%, Ni radical (>38%), Mn max. 4%, Si max. 1.5%, Mo >0-22%, Ti <4%, in particular <3.25%, Nb up to 6.0%, Cu up to 3%, in particular up to 0.5%, Fe <50%, P max. 0.05%, in particular max. 0.04%, Al up to 3.15%, in particular up to 2.5%, Mg max. 0.015%, V max. 0.6%, Zr max. 0.12%, in particular max. 0.1%, W up to 4.5%, in particular up to max. 3%, Co up to 28%, B<0.125%, O>0.00001-0.1% and impurities due to production, wherein Ni+Fe+Co represents 56-80% Nb+Ta<6.0%.

Disclosed herein is a method for deoxidizing an Al—Nb—Ti alloy, which includes melting and holding an Al—Nb—Ti alloy containing from 50 to 75 mass % of Al, from 5 to 30 mass % of Nb, and 80 mass % or less in total of Al and Nb by a melting method using a water-cooled copper vessel in an atmosphere of 1.33 Pa to 2.67×10.sup.5 Pa at a temperature of 1,900 K or more, thereby decreasing an oxygen content thereof. The Al—Nb—Ti alloy is prepared using an alloy material formed of an aluminum material, a niobium material and a titanium material and containing oxygen in a total amount of 0.5 mass % or more.

Disclosed herein is a method for deoxidizing an Al—Nb—Ti alloy, which includes melting and holding an Al—Nb—Ti alloy containing from 50 to 75 mass % of Al, from 5 to 30 mass % of Nb, and 80 mass % or less in total of Al and Nb by a melting method using a water-cooled copper vessel in an atmosphere of 1.33 Pa to 2.67×10.sup.5 Pa at a temperature of 1,900 K or more, thereby decreasing an oxygen content thereof. The Al—Nb—Ti alloy is prepared using an alloy material formed of an aluminum material, a niobium material and a titanium material and containing oxygen in a total amount of 0.5 mass % or more.

A tantalum or tantalum alloy which contains pure or substantially pure tantalum and at least one metal element selected from the group consisting of Ru, Rh, Pd, Os, Ir, Pt, Mo, W and Re to form a tantalum alloy that is resistant to aqueous corrosion. The invention also relates to the process of preparing the tantalum alloy.

A tantalum or tantalum alloy which contains pure or substantially pure tantalum and at least one metal element selected from the group consisting of Ru, Rh, Pd, Os, Ir, Pt, Mo, W and Re to form a tantalum alloy that is resistant to aqueous corrosion. The invention also relates to the process of preparing the tantalum alloy.

The invention relates to a steel wire suitable for making a spring or medical wire products which remarkably improve the performance of conventional stainless steel wire. The steel comprises (in wt. %): C: 0.02 to 0.15, Si: 0.1 to 0.9, Mn: 0.8 to 1.6, Cr 16 to 20, Ni: 7.5 to 10.5, Mo: ≤3, Al: 0.5 to 2.5, Ti: ≤0.15, N: ≤0.05, optional elements, and impurities, balance Fe, wherein the total amount of Cr and Ni is 25 to 27 wt. %, and wherein the steel has a microstructure including, in volume % (vol. %), martensite: 40 to 90, austenite: 10 to 60, and delta ferrite: ≤5.

A novel medium entropy alloy having the chemical formula Mo.sub.xCrNiCo (atomic %) where (x ranges from ˜0.4 to ˜1.0).

A novel medium entropy alloy having the chemical formula Mo.sub.xCrNiCo (atomic %) where (x ranges from ˜0.4 to ˜1.0).

The invention provides a preparation method of a nickel-based wrought superalloy wheel disk forging used at high temperature, in which the alloy has high content of solution strengthening elements W, Mo and strengthening phase γ′ phase forming elements Al, Ti, Nb and γ′ phase content reaches 55-65%. In view of a series of technical problems caused by high γ′ phase to alloy smelting and forging, the high-temperature stress relief annealing, low-temperature stress relief annealing process of steel ingot and high temperature homogenizing annealing of steel bar were proposed by optimizing the thermal process of wheel disk forging and controlling the precipitation and dissolution of γ′ phase.