Saturation Magnetization of Swaged Mn–Al

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Abstract
Two years ago remarkable properties were reported for a new alloy based on manganese and aluminum. The value for saturation magnetization in Mn=Al had been extrapolated to infinite magnetizing field and was given as 6200 gauss. Our measurements indicate that the extrapolated figure is too low. Magnetization values of over 7100 gauss have been measured at 13 000 oe. Extrapolations of these values to infinite fields are not made because of anomalies in the magnetization curves at 7500 oe and 12 000 oe. The material having the high magnetization had an energy product of 4.0×106 gauss oe. To reach the high values, it was necessary to adhere to processes and procedures having narrow limits. Saturation magnetization depended directly on composition, homogenizing, quenching rate, annealing, and deformation. The latter was most critical because a preferred axis of orientation is developed by this process. Mn–Al is very brittle, but the brittleness problem was circumvented by swaging the material in suitable jackets. Rockwell tests indicate that hardness is directly related to 4πM.

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