A carbon nano reinforced aluminum matrix conductive composite and a preparation method thereof are provided. In the preparation method, nano silicon dioxide chemically grows on the surface of graphene oxide, reduced graphene oxide@silicon dioxide carbon nano powder is prepared and reduced in the process of high-temperature sintering, and the mixed powder is blown into a melt using an inert gas, and then stirred, purified and cast.

Disclosed are a BCC dual phase refractory superalloy with high phase stability and a manufacturing method therefor, the alloy comprising one or more of Ti, Zr, and Hf as Group 4 transition metals, one or more of Nb and Ta as Group 5 transition metals, and Al, and having a structure of a BCC phase, wherein the BCC phase is composed of a disordered BCC phase and an ordered BCC phase, and wherein the ordered BCC phase is formed by allowing Al, which is a BCC phase forming element, to be soluted in an area of the BCC phase where the contents of the Group 5 transition metals are more than those of the Group 4 transition metals, so that the present disclosure provides a BCC dual phase refractory superalloy with high phase stability, characterized in that when a BCC dual phase with the ordered BCC phase and the disordered BCC phase separated from each other is formed by aging, the aging condition is precisely cont rolled through the apex temperature (T.sub.c) of the BCC phase miscibility gap, expressed by (Equation 1) below.
T.sub.c(K)=881.4+331.7*x+546.7*y+893.0*x*z  (Equation 1)
(provided that, 0≤x≤1, 0≤y≤0.2, 0≤x+y≤1, and 0≤z≤1).

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 method for producing a metal-based powder that is used in metal additive manufacturing, the method comprising: melting alloy metal precursors at a temperature above a liquidus temperature thereof until all alloy metal precursors are in liquid state, to produce a molten alloy; casting the molten alloy by transferring the molten alloy into a caster; cooling the molten alloy to a temperature of at least below the solidus temperature, at a cooling rate above about 50° C./s, to produce a cast alloy with a low density of precipitates; remelting the cast alloy with a low density of precipitates to produce a melted alloy; and forming the metal-based powder from the remelted alloy.

A high thermal conductive casting aluminum alloy is provided as an Al—Ni—Fe-based alloy, including, based on an entire alloy of 100 wt %, nickel (Ni) added at 1.0 to 1.3 wt %, iron (Fe) added at 0.3 to 0.9 wt %, and aluminum (Al) added as a balance.

An aluminum alloy material suitable for the manufacture of automotive body panels comprising: Si 0.6 to 1.2 wt %, Mg 0.7 to 1.3 wt %, Zn 0.25 to 0.8 wt %, Cu 0.02 to 0.20 wt %, Mn 0.01 to 0.25 wt %, Zr 0.01 to 0.20 wt %, with the balance being Al and incidental elements, based on the total weight of the aluminum alloy material. The aluminum alloy material satisfies the inequation of: 2.30 wt %≤(Si+Mg+Zn+2Cu) wt %≤3.20 wt %.

The present invention discloses a method for lowering an oil pipe in a gas well without well-killing, a soluble bridge plug and a material preparation method thereof, wherein, the method comprises the steps of: lowering a bridge plug in a wellbore such that the bridge plug blocks the wellbore at a predetermined location in the wellbore; injecting water in the wellbore after the pressure in the wellbore has been relieved so as to replace gases in the wellbore; and lowering an oil pipe in the wellbore to the location of the bridge plug. The method for lowering an oil pipe in a gas well without well-killing, the soluble bridge plug and the material preparation method thereof provided in the present invention successfully solve the problem of high cost for lowering an oil pipe under pressure after a fracturing fluid has been injected into the casing.

An ultrasound system for processing of liquid metal and their alloys, comprising at least one ultrasound transducer (301, 401, 501, 601, 701, 701a, 801a, 801b, 801c, 801d, 801e, 901, 1001) and at least one composite waveguide (302, 402, 502, 602, 702, 802, 902, 1002a-c) made of a composite material comprising a reinforcement and a matrix. The ultrasound transducer (301, 401, 501, 601, 701, 701a, 801a, 801b, 801c, 801d, 801e, 901, 1001) is coupled with the composite waveguide (302, 402, 502, 602, 702, 802, 902, 1002a-c)so that during operation it excites a standing wave of mechanical vibrations in the composite waveguide (302, 402, 502, 602, 702, 802, 902, 1002a-c). According to the invention, the matrix comprises a metallic and/or ceramic material whereas the reinforcement comprises fibers of metallic and/or ceramic material. Mechanical vibrations are transverse to the fibers of the reinforcement material. A method of processing of materials, in which material is melted and the melted material is subjected to the operating of a vibrating waveguide in the ultrasound system, characterized in that the ultrasound system according to the invention is used.

Disclosed herein are embodiments of aluminum-based alloys having improved intergranular corrosion resistance. Methods of making and using the disclosed alloy embodiments also are disclosed herein.

Disclosed herein are methods for producing an aluminum-scandium alloy comprising 0.41-4 wt % of scandium which can be used in industrial production setting. The method is carried out by melting aluminum and a mixture of salts comprising sodium, potassium and aluminum fluorides followed by performing simultaneously, while continuously supplying scandium oxide, an aluminothermic reduction of scandium from its oxide and an electrolytic decomposition of the formed alumina. Periodically, at least a portion of the produced alloy is removed, aluminum is then charged, and the process of alloy production is continued while supplying scandium oxide. Also disclosed is a reactor for producing an aluminum-scandium alloy pursuant to the methods described herein.