Grain alignment and microstructure of (Nd,Dy)12.8(Fe,M) 80.7B6.5 by strip casting

The alignment of Nd2Fe14B grains (T1) and the microstructure of (Nd,Dy)12.8(Fe,M) 80.7B6.5 strip cast ribbons are reported in this paper. In the strips there is a pronounced texture of the tetragonal T1 phase and the columnar grains exhibit apparent alignment along [0 0 L]. The alignment coefficient ϕ changes with the wheel speed V and is highest at V=1.5-2m/s. The Nd-rich phase is well segregated and widely distributed enclosing the fine columnar grains of the main phase in the strips prepared at V=2m/s. The magnetic properties of sintered magnets prepared from this kind of (Nd,Dy)12.8(Fe,M) 80.7B6.5 strip cast ribbons are as follows: Br=1.457 T(14.57 kG), Hcj=1048 kA/m (BH)max=408 kJ/m3 (51.3 MGOe).