Directional Magnetic Properties and Structures in the SmCo5-SmCu5 System Alloy

Kimura Yasuo, Kamino Kimiyuki

doi:10.2320/matertrans1960.11.132

The coercive force _BH_C of the intermetallic compound SmCo₅ is not sufficient for its application as a permanent magnet in the cast state. This study deals with increasing of the coercive force of the SmCo₅ alloy system. Specimens are melted in an arc melt furnace which has the tungusten electrode and inactive gas Ar. The directional magnetic properties are observed in the SmCo₅-SmCu₅ system alloy, as a result of freezing in a direction normal to the cold surface of the copper hearth. The maximum energy product, (BH)_max, of the 65 wt% SmCo₅-35 wt% SmCu₅ alloy has 5.78 MGOe in the as-cast state, when the measurement is carried out in a direction perpendicular to the chill plane. By annealing at 300°C for 1 hour, the (BH)_max value increases to 7.73 MGOe with Br 6450 G and _BH_C 3400 Oe. The magnetic properties in the direction perpendicular to the chill plane are superior to those in other directions and the chill plane shows a weak texture, (0001). These alloys have the easy direction of magnetization, which is the c-axis of the hexagonal crystal as in the case of SmCo₅. The lattice constants of both a- and c-axes of the hexagonal crystal enlarge linearly with increasing copper content in alloy. The value of lattice constant ratio c⁄a keeps approximately 0.802 in all the alloys investigated.

Directional Magnetic Properties and Structures in the SmCo<SUB>5</SUB>-SmCu<SUB>5</SUB> System Alloy

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