Abstract: PROBLEM: To provide a production method of an anisotropic rare earth magnet capable of being enhanced in coercivity without adding a large amount of a rare metal such as Dy and Tb. MEANS FOR RESOLUTION: A production method of a rare earth magnet, comprising a step of bringing a compact obtained by applying hot working to impart anisotropy to a sintered body having a rare earth magnet composition into contact with a low-melting-point alloy melt containing a rare earth element.

Abstract: A method for producing magnetic powder for forming a sintered body that is a precursor of a rare-earth magnet. Provided is a method for producing magnetic powder for forming a sintered body that is a precursor of a rare-earth magnet, which can produce magnetic powder with a structure containing optimal nanosized crystal grains by accurately and efficiently sorting out magnetic powder containing no coarse grains in the structure thereof.

Abstract: Provided is a rare-earth magnet containing no heavy rare-earth metals such as Dy or Tb in a grain boundary phase, has a modifying alloy for increasing coercivity (in particular, coercivity under a high-temperature atmosphere) infiltrated thereinto at lower temperature than in the conventional rare-earth magnets, has high coercivity, and has relatively high magnetizability, and a production method therefor. The rare-earth magnet RM includes a RE-Fe—B-based main phase MP with a nanocrystalline structure (where RE is at least one of Nd or Pr) and a grain boundary phase BP around the main phase, the grain boundary phase containing a RE-X alloy (where X is a metallic element other than heavy rare-earth elements). Crystal grains of the main phase MP are oriented along the anisotropy axis, and each crystal grain of the main phase, when viewed from a direction perpendicular to the anisotropy axis, has a plane that is quadrilateral in shape or has a close shape thereto.

Abstract: An Mg alloy provided with high strength and high ductility by matching the strength and ductility in tensile deformation and compressive deformation at the same levels is provided. The Mg alloy of the present invention is characterized by having a chemical composition consisting of Y: 0.1 to 1.5 at % and a balance of Mg and unavoidable impurities and having a microstructure with high Y regions with Y concentrations higher than an average Y concentration distributed at nanometer order sizes and intervals. The present invention further provides an Mg alloy characterized by having a chemical composition consisting of Y: more than 0.1 at % and a valance of Mg and unavoidable impurities, having a microstructure with high Y regions with Y concentrations higher than an average Y concentration distributed at nanometer order sizes and intervals and having an average recrystallized grain size within the range satisfying the following formula 1: ?0.87c+1.10<log d<1.14c+1.

Abstract: The present invention provides a method of production of a rare earth magnet which achieves high magnetization by hot working and at the same time secures high coercivity. A method of production of the present invention is a method for producing an R-T-B-based rare earth magnet comprising: molding a powder of an R-T-B-based rare earth alloy (R: rare earth element, T: Fe or Fe part of which is substituted by Co) to form a bulk; then hot working the bulk; and before the molding, mixing with the powder of an R-T-B-based rare earth alloy either a metal which forms a liquid phase in copresence with R at a temperature lower than the hot working temperature, or an alloy which forms a liquid phase at a temperature lower than the hot working temperature.

Abstract: A method of producing an R-T-B rare earth magnet that include forming an R-T-B (R: rare-earth element, T: Fe, or Fe and partially Co that substitutes for part of Fe) rare earth alloy powder into a compact and performing hot working on the compact, wherein the hot working is performed in a direction that is different from the direction in which the forming was performed.

Abstract: The method of the present invention produces a rare earth magnet, which is represented by a neodymium magnet (Nd2Fe14B) and neodymium magnet films with applications in micro-systems, by using a heat treatment method capable of enhancing the magnetic characteristics, particularly the magnetic coercive force. A method for producing a rare earth magnet, comprising: (a) quenching a molten metal having a rare earth magnet composition to form quenched flakes of nanocrystalline structure; sintering the quenched flakes; subjecting the sintered body obtained to an orientation treatment; and applying a heat treatment with pressurization at a temperature sufficiently high to enable diffusion or fluidization of a grain boundary phase and at the same time, low enough to prevent coarsening of the crystal grains.

Abstract: Provided is a manufacturing method of a rare-earth magnet capable of penetrant-diffusing a modifier alloy to increase a coercive force (especially a coercive force under a high-temperature atmosphere) at a temperature lower than the conventional method for manufacturing a rare-earth magnet without using heavy rare-earth metals such as Dy and Tb, and accordingly capable of manufacturing a high coercivity rare-earth magnet at the lowest cost possible.

Abstract: A method for producing a sintered rare-earth magnet characterized by sintering a raw material that includes a ribbon-shaped polycrystalline phase with an average grain size of 10 to 200 nm fabricated by rapid solidification of an alloy melt having a rare-earth magnet composition, and a low-melting point phase formed on the surface of the polycrystalline phase and having a melting point lower than the polycrystalline phase.

Abstract: PROBLEM: To provide a production method of an anisotropic rare earth magnet capable of being enhanced in coercivity without adding a large amount of a rare metal such as Dy and Tb. MEANS FOR RESOLUTION: A production method of a rare earth magnet, comprising a step of bringing a compact obtained by applying hot working to impart anisotropy to a sintered body having a rare earth magnet composition into contact with a low-melting-point alloy melt containing a rare earth element.

Abstract: A molten alloy that has a nanocomposite magnet composition is quenched and solidified to fabricate a foil that has a polycrystalline phase composed of a hard magnetic phase with an average crystal grain diameter of 10 to 200 nm and a soft magnetic phase with an average crystal grain diameter of 1 to 100 nm. The foil that includes a low melting point phase that is formed on a surface of the foil and that has a melting point that is lower than that of the polycrystalline phase is sintered.

Abstract: A rare earth magnet of the invention has a composition represented by the compositional formula RaHbFecCodBeMf, where: R is at least one rare earth element including Y; H is at least one heavy rare earth element from among Dy and Tb; M is at least one element from among Ga, Zn, Si, Al, Nb, Zr, Ni, Cu, Cr, Hf, Mo, P, C, Mg, and V; 13?a?20; 0?b?4; c=100?a?b?d?e?f; 0?d?30; 4?e?20; 0?f?3, and has a structure constituted by a main phase: a (RH)2(FeCo)14B phase, and a grain boundary phase: a (RH)(FeCo)4B4 phase and a RH phase, with a crystal grain size of the main phase of 10 nm to 200 nm.

Abstract: An electrode catalyst for a fuel cell, which has improved performance compared with conventional platinum alloy catalysts, a method for producing the electrode catalyst, and a polymer electrolyte fuel cell using the electrode catalyst are provided. The electrode catalyst for a fuel cell comprises a noble-metal-non-precious metal alloy that has a core-shell structure supported on a conductive carrier. The composition of the catalyst components of the shell is such that the amount of the noble metal is greater than or equal to the amount of the non-precious metal.

Abstract: A method for producing an NdFeBCu magnet includes supplying an alloy melt having a composition that is represented by the general formula NdyFe100-x-y-zBzCuX, where x is between 1 and 3 inclusive, y is larger than 12 and at most 24, and z is larger than 6 and at most 12, onto a cooled roll to obtain a quenched ribbon as a ribbon shaped magnetic material.

Abstract: An NdFeBGa magnet material has a composition that is represented by the genera formula NdyFe100-x-y-zBzGax, where x is between 1 and 3 inclusive, y is between 14 and 24 inclusive, and z is between 7 and 12 inclusive.

Abstract: A nanocomposite magnet containing an Fe particle in the grain boundary of an Nd2Fe14B compound particle is produced by mixing a dispersion of the Nd2Fe14B compound particle in a solvent containing a surface-active agent and a dispersion of the Fe particle in a solvent containing a surface-active agent, and then supporting the Fe particle on the surface of the Nd2Fe14B compound particle by stirring the mixture of the dispersions while adding an amphiphilic solvent, and then performing the drying and the drying and the sintering.

Abstract: The present invention has as its object to provide an Mg-based alloy cold worked member which can remarkably lower the load weight required for cold plastic working and enables practical usage of the same. The present invention is an Mg-based alloy cold worked member obtained by cold working an Mg-based alloy to form it into a predetermined shape, characterized by having a microstructure which includes crystal grains divided and made finer by cold working.

Abstract: An electrode catalyst for a fuel cell, which has improved performance compared with conventional platinum alloy catalysts, a method for producing the electrode catalyst, and a polymer electrolyte fuel cell using the electrode catalyst are provided. The electrode catalyst for a fuel cell comprises a noble-metal-non-precious metal alloy that has a core-shell structure supported on a conductive carrier. The composition of the catalyst components of the shell is such that the amount of the noble metal is greater than or equal to the amount of the non-precious metal.

Abstract: A method of producing a permanent magnet includes: forming a multiplicity of solidified ribbons that are composed of nanosized crystal grains by melting a magnet material and rapidly cooling the molten product; binding the multiplicity of solidified ribbons together by compression molding and sintering to form a sintered body; and performing plastic forming on the sintered body to provide the sintered body with a distribution of strain which increases from a peripheral portion to a central portion.

Abstract: A method of producing core/shell composite nano-particles exhibiting superior characteristics, by using as cores nano-particles heat treated in advance so as to give them a specific crystal structure in a state using a barrier layer to prevent sintering and forming shells on their surface, which eliminates hindrances to the shell forming reaction due to the phase transfer catalyst or other strongly sticky dispersant, is provided.