Role of Si Addition on the Crystallization Behavior, Thermal Stability, and Magnetic Properties of the FeNiMoBSi Alloys

摘要

Effects of Si addition on the amorphous forming ability, thermal stability, and soft magnetic properties of the Fe40Ni38Mo4B18-xSix (x = 0, 2, 4, 6, 8, 10, and 12) alloys were investigated. It is found that the partial substitution of Si for B suppresses the crystallization and promotes the formation of amorphous structure. The primary crystallization temperature (T-x1), the secondary crystallization temperature (T-x2), and the temperature difference ( increment T) between primary and secondary crystallization increases with the increase of Si content (<= 4 at. %), which effectively improves the amorphous forming ability and the thermal stability of the residual amorphous matrix. For the melt-spun state, the Fe40Ni38Mo4B14Si4 amorphous alloy exhibits a low Hc of 5.8 A/m and a high Ms of 86.5 emu/g. After optimum annealing treatments at 618 K for 10 min, the Fe40Ni38Mo4B14Si4 nanocrystalline ribbon shows higher Ms of 103.2 emu/g and low Hc of 7.0 A/m.

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