The invention relates to the field of metallurgy, namely to new heat-resistant aluminum alloys used in additive technologies. The alloy includes nickel, manganese, iron, zirconium, cerium, at least one element selected from the group: copper, magnesium, zinc, and at least one element selected from the group: silicon, calcium, where Ni>Mn+Fe, one or more eutectic phases of the type of Al.sub.3Ni, Al.sub.16Mn.sub.3Ni, Al.sub.9FeNi, which are thermally stable, and dispersoids of the Al.sub.3Zr type, which ensure an ultimate strength of a resulting product of at least 370 MPa. The technical effect is the development of an aluminum material used in the form of a powder, which has good processability when printing and increased strength characteristics at room temperature after printing, without a significant decrease in strength after annealing.

A metal powder producing apparatus comprising a melted metal supplying part discharging a melted metal, a cylinder body provided below the melted metal supplying part, and a cooling liquid layer forming part forming a flow of a cooling liquid for cooling the melted metal discharged from the melted metal supplying part along an inner circumference face of the cylinder body, wherein the cooling liquid layer forming part has a primary pressure reservoir, and the primary pressure reservoir is provided on an outer circumference part of the cylinder body.

A metal powder producing apparatus comprising a melted metal supplying part discharging a melted metal, a cylinder body provided below the melted metal supplying part, and a cooling liquid layer forming part forming a flow of a cooling liquid for cooling the melted metal discharged from the melted metal supplying part along an inner circumference face of the cylinder body, wherein the cooling liquid layer forming part has a primary pressure reservoir, and the primary pressure reservoir is provided on an outer circumference part of the cylinder body.

A method for prepares low melting point metal particles, a conductive paste and a method for preparing the conductive paste, and relates to the technical field of functional materials. The method for preparing low melting point metal particles includes providing an organic resin carrier having fluidity, adding a low melting point metal material and the organic resin carrier into a sealed container for a vacuuming operation or filling a protective gas, making a temperature in the sealed container higher than the melting point of the low melting point metal and performing dispersion by stirring, and lowering the temperature, after performing the dispersion, to be below the melting point of the low melting point metal with continuous stirring during a cooling process to obtain low melting point metal particles dispersed in the organic resin carrier. Low melting point metal particles can be effectively prepared.

Disclosed herein are metal matrix composites and methods of making and use thereof. For example, disclosed herein are methods of making a metal matrix composite comprising a metal matrix reinforced by a high entropy alloy. The methods comprise mixing a first powder and a second powder to form a powder mixture, wherein the first powder comprises a plurality of particles comprising a metal and the second powder comprises a plurality of particles comprising a high entropy alloy. The methods further comprise compacting the powder mixture to form a pellet and adding the pellet to a molten metal, the molten metal comprising the metal in a molten state, thereby melting the pellet to form a molten mixture. The methods further comprise subjecting the molten mixture to an ultrasonic treatment and casting the ultrasonic treated mixture to form the metal matrix composite.

Disclosed herein are metal matrix composites and methods of making and use thereof. For example, disclosed herein are methods of making a metal matrix composite comprising a metal matrix reinforced by a high entropy alloy. The methods comprise mixing a first powder and a second powder to form a powder mixture, wherein the first powder comprises a plurality of particles comprising a metal and the second powder comprises a plurality of particles comprising a high entropy alloy. The methods further comprise compacting the powder mixture to form a pellet and adding the pellet to a molten metal, the molten metal comprising the metal in a molten state, thereby melting the pellet to form a molten mixture. The methods further comprise subjecting the molten mixture to an ultrasonic treatment and casting the ultrasonic treated mixture to form the metal matrix composite.

A cutting tool is made of a cemented carbide including a first hard phase and a binder phase. The first hard phase is composed of WC particles. The binder phase contains Co and/or Ni. The cutting tool includes a main body part and a surface layer part. A thickness of the surface layer part is equal to or less than an average particle diameter of the first hard phase. On a surface of a plain part in a rake face, 1.0 GPa or more of a compressive residual stress is applied to the first hard phase. A ratio (B/A) of the average particle diameter (B) of the first hard phase on the surface of the plain part in the rake face to an average particle diameter (A) of the first hard phase on a cross section of the main body part is 0.7 or more and less than 1.

A cutting tool is made of a cemented carbide including a first hard phase and a binder phase. The first hard phase is composed of WC particles. The binder phase contains Co and/or Ni. The cutting tool includes a main body part and a surface layer part. A thickness of the surface layer part is equal to or less than an average particle diameter of the first hard phase. On a surface of a plain part in a rake face, 1.0 GPa or more of a compressive residual stress is applied to the first hard phase. A ratio (B/A) of the average particle diameter (B) of the first hard phase on the surface of the plain part in the rake face to an average particle diameter (A) of the first hard phase on a cross section of the main body part is 0.7 or more and less than 1.

An R-T-B based sintered magnet containing a first heavy rare earth element, in which R includes Nd, T includes Co and Fe, the first heavy rare earth element includes Tb or Dy, the R-T-B based sintered magnet has a region in which a concentration of the first heavy rare earth element decreases from the surface toward the inside, a first grain boundary phase which contains the first heavy rare earth element and Nd but does not contain Co is present in one cross section including the region, and an area occupied by the first grain boundary phase in one cross section including the region is 1.8% or less.

An R-T-B based sintered magnet containing a first heavy rare earth element, in which R includes Nd, T includes Co and Fe, the first heavy rare earth element includes Tb or Dy, the R-T-B based sintered magnet has a region in which a concentration of the first heavy rare earth element decreases from the surface toward the inside, a first grain boundary phase which contains the first heavy rare earth element and Nd but does not contain Co is present in one cross section including the region, and an area occupied by the first grain boundary phase in one cross section including the region is 1.8% or less.