TI-SUBSTITUTED HARD MAGNETIC MECHANICALLY ALLOYED SM2FE17NX

Sm12.6Fe87.4-zTiz with z = 2, 3 and 4 elemental powder blends were mec hanically alloyed and subsequently two-step heat treated to form hard magnetic microcrystalline Sm-(Fe,Ti)-N. The optimum constitution, i.e. the formation of mainly Sm2(Fe,Ti)17Nx, accompanied by a small fracti on of Sm(Fe,Ti)9Nx, and, particularly, the suppression of alpha-Fe pre cipitation, was achieved for 3 at. % Ti. Such material possesses an al most completely step-free hysteresis loop, a remanence of 0.73 T and a coercivity of 16 kA/cm (20 kOe) resulting in a maximum energy product of 90 kJ/m3 (11.2 MGOe) in the powder.