Abstract
The glass forming ability, thermal stability, microstructure, and magnetic properties of Fe83.3(Si4B8P4)16−xCu0.7Mox (x = 0, 0.5, 1, and 1.5) alloys are studied to investigate the influence of Mo addition. With increasing Mo content, the negative mixing enthalpy (ΔHmix) increases and the Delta parameter (δ) decreases, which leads to a decline in the glass forming ability. The secondary crystallization temperature increases continuously with increasing Mo content. A small amount of Mo improves sufficiently the thermal stability of the alloy system, which can bear higher temperatures (up to 520 °C) for longer time (up to 40 min) without the formation of compounds because of their increased activation energy. The saturation magnetic flux density (Bs) decreases from 1.78 to 1.68 T with increasing Mo content as a result of the lower volume fraction of the α-Fe phase. Optimum magnetic properties with Bs = 1.74T and Hc = 8.2A/m are achieved in Fe83.3(Si4B8P4)15Cu0.7Mo1 ribbon.
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