Magnetic hardening of Sm-Fe-Ti alloys

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Abstract
The coercivity Hci of melt‐spun Sm‐Fe‐Ti alloys can be increased to above 4.0 kA/cm by the addition of Zr and Co. Co‐substitutions also enhance the remanence Jr and suppress the formation of α‐Fe, both of which result in a high‐energy product, (BH)max, of up to 56 kJ/m3, the highest value reported so far for 1:12‐type magnets. In Sm20Fe70Ti10 alloys prepared by mechanical alloying or by rapid quenching a new hard‐magnetic phase is observed with room‐temperature coercivities of 40 and 33 kA/cm, respectively.