METHOD OF PRODUCING ALLOY FOR IRON-BASED RARE EARTH MAGNET

PROBLEM TO BE SOLVED : To stably produce a rapidly cooled alloy for a high performance nanocomposite magnet by using a rapid cooling device having a relatively low rapid cooling rate. SOLUTION : A primary rapid cooling stage where the molten metal of an iron-based rare earth magnet alloy is rapidly cooled, so that crystallization is started in the process of solidifying the molten metal is performed. Thereafter, a second rapid cooling stage where the alloy in which crystallization has been started by the first rapid cooling stage is contacted with a cooling medium, and the alloy is further rapidly cooled to suppress the growth in the grains of the crystal phase is performed. Thus, the alloy temperature is changed so as to follow a cooling path 1.