On the Wiedemann Effect of the Magnetostriction Alloy “Alfer” at High Temperatures

Abstract

The Wiedemann effect of “Alfer” (12.91% Al-Fe alloy) was measured with the annealed specimen at high temperatures. As the temperature rise, the effect gradually decreases at the eonstant current through the specimen, and also the higher the temperature is the weaker the field is for the maximum effect. Keeping the eurrent through the specimen as well as the longitudinal field constant, the effect gradually decreases with the rise of temperature, and becomes extremely small at the magnetic transformation temperature of the Fe₃Al superlattice, and vanishes at the magnetic transformation temperature of α phase. The effect of Ni and Fe was measured to compare with that of Alfer. The temperature change of Ni is similar to that of Alfer, but the change of Fe is different from the both and gradually increases as the temperature rise, and after reaching a maximum at about 600°, rapidly decreases, becoming zero at the magnetic transformation temperature.