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US 2017/0250024 A1Published application
Rare-Earth-Free Permanent Magnetic Materials Based on Fe-Ni
AssigneesNortheastern University, The Trustees of Columbia University in the City of New York
InventorsLaura H. LEWIS, Katayun BARMAK VAZIRI
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Abstract
The invention provides high coercivity magnetic materials based on FeNi alloys having an L10 phase structure, and methods for making the materials.
Claims23
A method of making a magnetic FeNi ordered compound, the method comprising the steps of:
- (a) preparing a melt comprising Fe, Ni, and optionally one or more elements selected from the group consisting of Ti, V, Al, B, and C, wherein the ratio of elements in the melt is according to the formula Fe(0.5−a)Ni(0.5−b)X(a+b), wherein X is Ti, V, Al, B, or C, and wherein 0≦(a+b)<0.1;
- (b) cooling the melt to yield a solid form of an FeNi alloy material;
- (c) subjecting the solid form to a severe plastic deformation process performed below a chemical ordering temperature of the desired L10 phase to yield a deformed FeNi alloy material;
- and
- (d) annealing the deformed FeNi alloy material in a reduced oxygen environment at a temperature below the chemical ordering temperature of the desired L10 phase for a period of time from hours to months, whereby L10 structure is formed to yield the magnetic FeNi ordered compound.
2 more elements
A magnetic FeNi ordered compound produced by the method of any of the preceding claims.
A magnetic FeNi ordered compound having the formula Fe(0.5−a)Ni(0.5−b)X(a+b), wherein X is Ti, V, Al, B, or C, wherein 0<(a+b)<0.1, and wherein the ordered compound comprises L10 structure.
Dependencies are inferred from the claim text.