Disclosed are interfacially modified metal particulate composite materials for use in powder metallurgy sintered products and processes.

To provide a rare earth magnet ensuring excellent magnetic anisotropy while reducing the amount of Nd, etc., and a manufacturing method thereof. A rare earth magnet comprising a crystal grain having an overall composition of (R2.sub.(1-x)R1.sub.x).sub.yFe.sub.100-y-w-z-vCo.sub.wB.sub.zTM.sub.v (wherein R2 is at least one of Nd, Pr, Dy and Tb, R1 is an alloy of at least one or two or more of Ce, La, Gd, Y and Sc, TM is at least one of Ga, Al, Cu, Au, Ag, Zn, In and Mn, 0<x<1, y=12 to 20, z=5.6 to 6.5, w=0 to 8, and v=0 to 2), wherein the average grain size of the crystal grain is 1,000 nm or less, the crystal grain consists of a core and an outer shell, the core has a composition of R1 that is richer than R2, and the outer shell has a composition of R2 that is richer than R1.

To provide a rare earth magnet ensuring excellent magnetic anisotropy while reducing the amount of Nd, etc., and a manufacturing method thereof. A rare earth magnet comprising a crystal grain having an overall composition of (R2.sub.(1-x)R1.sub.x).sub.yFe.sub.100-y-w-z-vCo.sub.wB.sub.zTM.sub.v (wherein R2 is at least one of Nd, Pr, Dy and Tb, R1 is an alloy of at least one or two or more of Ce, La, Gd, Y and Sc, TM is at least one of Ga, Al, Cu, Au, Ag, Zn, In and Mn, 0<x<1, y=12 to 20, z=5.6 to 6.5, w=0 to 8, and v=0 to 2), wherein the average grain size of the crystal grain is 1,000 nm or less, the crystal grain consists of a core and an outer shell, the core has a composition of R1 that is richer than R2, and the outer shell has a composition of R2 that is richer than R1.

A method for manufacturing a poppet valve or mushroom valve includes providing a mixture of metal powder and a binder, filling and pressing said mixture in a mold, to obtain a green product, removing the binder from the green product, and thermally sintering the green product to a poppet valve blank, by hot isostatic pressing. A poppet valve is also provided that is manufactured with this method.

A magnetic powder is provided. The magnetic powder includes a main body portion including an L10-FeNi. The magnetic powder further includes an oxide layer formed on a surface of the main body portion. A magnet is also provided. The magnet includes a base material. The magnet further includes the magnetic powder dispersed in the base material.

A magnetic powder is provided. The magnetic powder includes a main body portion including an L10-FeNi. The magnetic powder further includes an oxide layer formed on a surface of the main body portion. A magnet is also provided. The magnet includes a base material. The magnet further includes the magnetic powder dispersed in the base material.

According to aspects of the present disclosure, a ternary alloy includes a dual-phase microstructure including a first phase and a second phase. The first phase defines a hexagonal close-packed structure with a stoichiometric ratio of Al.sub.4Fe.sub.1.7Si. The second phase defines a face-centered cubic structure with a stoichiometric ratio of Al.sub.3Fe.sub.2Si. The dual-phase microstructure is stable above about 800 C., and the dual-phase microstructure has a first-phase abundance greater than about 50 parts by weight and a second-phase abundance less than about 50 parts by weight based on 100 parts by weight of the ternary alloy.

According to aspects of the present disclosure, a ternary alloy includes a dual-phase microstructure including a first phase and a second phase. The first phase defines a hexagonal close-packed structure with a stoichiometric ratio of Al.sub.4Fe.sub.1.7Si. The second phase defines a face-centered cubic structure with a stoichiometric ratio of Al.sub.3Fe.sub.2Si. The dual-phase microstructure is stable above about 800 C., and the dual-phase microstructure has a first-phase abundance greater than about 50 parts by weight and a second-phase abundance less than about 50 parts by weight based on 100 parts by weight of the ternary alloy.

Dispersion strengthened aluminum-cerium-manganese alloys containing from about 0.05 to about 23.0 weight percent cerium and about 0.03 to about 9.5 weight percent manganese exhibit mechanical properties that make them useful alloys as a result of age hardening for extended periods at temperatures between 350 C. (662 F.) and 450 C. (842 F.).

Dispersion strengthened aluminum-cerium-manganese alloys containing from about 0.05 to about 23.0 weight percent cerium and about 0.03 to about 9.5 weight percent manganese exhibit mechanical properties that make them useful alloys as a result of age hardening for extended periods at temperatures between 350 C. (662 F.) and 450 C. (842 F.).