Abstract
A twin-rolls process for the rapid solidification of metals in a static magnetic field up to 14 kOe has been developed using original composite twin-rolls which are portions of a magnetic circuit. The effects of a magnetic field applied during rapid solidification on the structure and magnetic properties of Mn55Al45 magnetic materials, particularly of the τ single phase materials, have been investigated. The x-ray diffraction technique, optical microscopy, and the hysteresis loop measurement were employed to clarify the effects. It was found that the applied magnetic field decreased the solidification speed and subsequently stabilized the ferromagnetic metastable τ phase in an appropriate rotation rate. In addition, the application of magnetic field led to the increase of the coercivity of the τ single phase materials. This effect is considered to be attributable to the difference in the degree of order of the τ phase in the absence and presence of a magnetic field during rapid solidification.
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