Nd-Fe-B超急冷粉末のパック圧延異方性化過程の解析

抄録

We have applied multi-pass packed-rolling to producing anisotropic Nd-Fe-B-Cu powders from rapidly-quenched ribbons. Analysis for the packed-rolling process shows that densification proceeds from the surface of the packed powder-compact and crystallographic alignment proceeds more rapidly at the center. Rolling with ribbon-thickness reduction higher than 80% produces a uniform material with a high (BH)_max, up to 38 MGOe. The present paper discusses the alignment mechanism considering internal-stress distribution inside the powder-compact under rolling pressure.