Abstract
The present investigators previously found a new magnet alloy “Malcolloy” having a high coercive force in the system of cobalt and aluminum and then have carried out studies on the influence of the addition of nickel, molybdenum and titanium on their magnetic properties; the highest coercive force obtained being 1600 Oe. Further, they have investigated the influence of the addition of vanadium on the properties of Co-Al alloys and discovered that the addition of vanadium increases the coercive force of the binary alloys. Thus, an alloy with the composition of 81.93%Co, 13.42%Al and 4.65%V shows a coercive force of 1450 Oe, a residual magnetic flux density of 3200 G, and a maximum energy product of 1.40×106 G·Oe, when tempered at 550°C for 15 hours after water-quenching from 1370°C. These alloys consist of many ferromagnetic elongated particles of about 300∼400 Å diameter which are dispersed in the matrix of almost non-magnetic β′ phase. Consequently, it may be concluded that the high coercivity of these alloys is mainly caused by the existence of the small particles, each of them being composed of a single magnetic domain.
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