R-T-B sintered permanent magnet and quenched alloy for R-T-B sintered permanent magnet using the sam

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PROBLEM TO BE SOLVED : To provide a quenched alloy for an R-T-B-based sintered permanent magnet, which has a structure in which constituents of an R-rich phase are uniformly and finely dispersed, has superior crushability and can enhance an orientation degree. SOLUTION : The quenched alloy for the R-T-B-based sintered permanent magnet (wherein R represents at least one element among rare earth elements, T represents at least one element among transition metal elements and B represents boron) is formed into a thin-sheet shape by quenching a molten metal of the alloy, and has a radial structure starting from a nucleation point formed on both principal surfaces of the thin sheet, in which a ratio I(410)/I(006)of the intensities I(410)and I(006)of X-ray diffraction patterns (410) and (006) respectively is 0.2 or less in the both principal surfaces and in planes parallel to the both principal surfaces in a region from one principal surface to the other principal surface, and the c-axis is oriented in a direction perpendicular to the both principal surfaces. COPYRIGHT : (C)2009, JPO&INPIT