A metallographic method for the determination of crystal alignment in Co-R permanent magnets

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Abstract
A metallographic method has been developed for determining the alignment of grains in sintered cobalt‐rare‐earth permanent magnets. The basis for the method is to use the eutectoid transformtion of the Co5R phase to decorate th basal planes, and thus enable one to determine some information of the orientation of the grain with respect to the alignment direction. The method has been used to sutdy the degree of alignment in aligned and unaligned Co‐Sm magnet samples. It is shown that it is possible to obtain quantitative grain alignment results which compare favorably with alignment data obtained from magnetic measurements and x‐ray diffraction.

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