Study of magnetic properties and structural and phase transformations in the Co-19 at % Al-6 at % W alloy

Abstract

The Co-19 at % Al-6 at % W alloy prepared by two methods of melting in an inert atmosphere, namely, by arc melting followed by casting into a water cold copper mold and induction melting followed by casting in a ceramic (Al 2 O 3 ) mold, has been studied. It was found that the phase composition of the alloy and its magnetic properties depend on the cooling rate of ingot after melting. Samples are ferromagnetic up to 800°C; the specific magnetization equal to σ= 10 emu/g is retained up to ~700°C. The Curie temperatures of all phases found in the alloy have been determined. It was found that the formation of the Co 7 W 6 phase in the alloy increases the coercive force of the alloy, whereas the saturation magnetization demonstrates a 1.5 fold decrease.