Abstract: A method for metal powder injection molding includes injecting a first metal powder of a TiAl-based intermetallic compound into a mold, and molding the first metal powder through use of an injection molding machine; injecting a second metal powder of a TiAl-based intermetallic compound having a same constituent as the first metal powder and having a different average particle diameter from the first metal powder into a mold, and molding the second metal powder through use of the injection molding machine; and sintering molded articles obtained by molding the first metal powder and the second metal powder, and producing a mixed sintered compact in which a first sintered compact of the molded article obtained by molding the first metal powder and a second sintered compact of the molded article obtained by molding the second metal powder are integrated.

Abstract: A method is for producing a TiAl-based intermetallic sintered compact. The method includes mixing Ti powder, Al powder, and a binder to yield a mixture; molding the mixture into a molded product having a predetermined shape with a metal injection molder; placing the molded product in a preliminary sintering die having a storage space inside; performing sintering at a predetermined preliminary sintering temperature to produce a preliminary sintered compact; releasing the preliminary sintered compact from the preliminary sintering die; and performing sintering at a sintering temperature higher than the preliminary sintering temperature to form the TiAl-based intermetallic sintered compact.

Abstract: A gas atomization nozzle includes a through-hole formed along a center line; a nozzle portion configured of a Laval nozzle which is disposed around the center line and provided to be inclined at a predetermined angle toward the center line; and swirling motion imparting means for imparting a swirling flow around the center line to gas which is injected from the nozzle portion. The nozzle portion is formed in a ring shape which is continuous around the center line, and the swirling motion imparting means is configured as a fin provided in the nozzle portion to impart a swirling flow.

Abstract: A metal member related to the present invention is provided with crystal grains of a metal and a granular reinforcing substance formed at boundaries of the crystal grains. The reinforcing substance includes grains of a shape with a grain area equivalent grain size larger than 1/100 of a grain area equivalent grain size of the crystal grains. The granular reinforcing substance preferably includes grains with a grain area equivalent grain size smaller than ? of the grain area equivalent grain size of the crystal grains. Additionally, the granular reinforcing substance preferably includes grains of a shape wherein a value of a length, in a first direction in which a length thereof is longest, divided by a length of a longest part in a direction orthogonal to the first direction is smaller than 5. A metal member with a high strength at high temperatures is manufactured by metal powder injection molding.

Abstract: A method for metal powder injection molding includes injecting a first metal powder of a TiAl-based intermetallic compound into a mold, and molding the first metal powder through use of an injection molding machine; injecting a second metal powder of a TiAl-based intermetallic compound having a same constituent as the first metal powder and having a different average particle diameter from the first metal powder into a mold, and molding the second metal powder through use of the injection molding machine; and sintering molded articles obtained by molding the first metal powder and the second metal powder, and producing a mixed sintered compact in which a first sintered compact of the molded article obtained by molding the first metal powder and a second sintered compact of the molded article obtained by molding the second metal powder are integrated.

Abstract: A gas atomization nozzle includes a through-hole formed along a center line; a nozzle portion configured of a Laval nozzle which is disposed around the center line and provided to be inclined at a predetermined angle toward the center line; and swirling motion imparting means for imparting a swirling flow around the center line to gas which is injected from the nozzle portion. The nozzle portion is formed in a ring shape which is continuous around the center line, and the swirling motion imparting means is configured as a fin provided in the nozzle portion to impart a swirling flow.

Abstract: A method is for producing a TiAl-based intermetallic sintered compact. The method includes mixing Ti powder, Al powder, and a binder to yield a mixture; molding the mixture into a molded product having a predetermined shape with a metal injection molder; placing the molded product in a preliminary sintering die having a storage space inside; performing sintering at a predetermined preliminary sintering temperature to produce a preliminary sintered compact; releasing the preliminary sintered compact from the preliminary sintering die; and performing sintering at a sintering temperature higher than the preliminary sintering temperature to form the TiAl-based intermetallic sintered compact.

Abstract: Provided are a nickel-base alloy having high high-temperature strength, a turbine blade using same, and a method for producing an injection molded article of the nickel-base alloy. The nickel-base alloy contains: at least one metal element from among chrome, molybdenum, and niobium; nickel; aluminum; and carbon. The nickel-base alloy comprises a plurality of crystal grains and a plurality of precipitates. The areas between the individual crystal grains in the nickel-base alloy, i.e., the boundaries of the individual crystal grains serve as crystal grain boundaries. The crystal grains are crystals in which nickel is the primary component. The precipitates are precipitated on the crystal grain boundaries. The precipitates are carbides comprising: at least one metal element from among chrome, molybdenum, and niobium; and carbon. The carbides have a diameter of 0.1-10 ?m and an aspect ratio of 3 or more.