| 简介 |
Provided are alloy flakes to be used as a starting material for a rare earth sintered magnet, said alloy flakes showing regulated formation of chill crystals, having a highly uniform shape of the 2-14-1 main phase and showing a highly uniform dispersion state of the R-rich phase, and a method for producing the same. The alloy flakes according to the present invention satisfy the following requirements (1) to (3) and have roll-cooled surface that is obtained by a strip casting method using cooling rolls : (1) comprising at least one member (R) that is selected from rare earth metal elements including Y, B and the balance (M) containing iron, each at a specific ratio; (2) in a microscopic image (100 × magnification) of the roll-cooled surface, having 5 or more crystals that have a specific aspect ratio and a specific particle diameter, in which dendrites grow in a circular pattern around the originating point of a crystal nucleus crossing a line segment corresponding to 880 μm; and (3) in a microscopic image (200 × magnification) of a cross section roughly perpendicular to the roll-cooled surface, the average interval of the R-rich phase being 1 μm or longer and shorter than 10 μm. |
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