RARE EARTH MAGNET ALLOY INGOT, MANUFACTURING METHOD FOR THE SAME, R-T-B TYPE MAGNET ALLOY INGOT,

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An R-T-B exchange spring magnet alloy ingot is provided, wherein the R-T-B exchange spring magnet alloy ingot comprises at least one element selected from Nd, Pr, and Dy in a total amount of 1 to 12% by atom and B in an amount of 3 to 30% by atom, with a balance being T (T represents a substance predominantly comprising Fe, with a portion of Fe atoms being optionally substituted by Co, Ni, Cu, Al, Ga, Cr, and Mn). The R-T-B exchange spring magnet alloy ingot is produced through formation of a composite of crystal grains of a hard magnetic phase and crystal grains of a soft magnetic phase. The R-T-B exchange spring magnet alloy ingot contains crystal grains of a hard magnetic phase having a grain size of 1 μm or less and crystal grains of a soft magnetic phase having a grain size of 1 μm or less in a volume of at least 50% on the basis of the entire volume of the alloy.