Abstract
The effect of heat treatment on crystallization behavior of Fe73.5B15Si10Nb1.5 alloy powder prepared by mechanical alloying was studied. The powder samples were prepared by mechanical alloying (MA) and for different milling times (1, 5, 25, 70 and 100 hours). Crystalline powders of iron, boron, silicon and niobium were sealed with tungsten carbide balls in a cylindrical vial under nitrogen atmosphere. The ball-to-powder weight ratio was 20 to 1. A Fritsch Pulverizette 5 planetary ball mill was used for MA the powders at room temperature and at 250 rpm. To study the microstructural evolution, a small amount of powder was collected after different milling times and examined by X-ray diffraction, using CuKalpha radiation (lambda = 0.15418 nm). The crystallization behavior was studied by differential thermal analysis, from 25 up to 1000 °C at a heating rate of 25 °C min-1.
Highlights
In the last two decades there has been growing interest in amorphous and nanocrystalline alloys based on Fe–Si–B
Amorphous and nanocrystalline alloys obtained by the melt spinning technique belong to a group of soft magnetic materials, with magnetic properties significantly better than conventional silicon steels[1,2]
The milled samples were analyzed by X-ray diffraction and differential thermal analysis (DTA)
Summary
In the last two decades there has been growing interest in amorphous and nanocrystalline alloys based on Fe–Si–B. Amorphous and nanocrystalline alloys obtained by the melt spinning technique belong to a group of soft magnetic materials, with magnetic properties significantly better than conventional silicon steels[1,2]. These materials reveal relatively high resistivity, which drastically reduces eddy current losses (lower hysteresis). Magnetic properties of amorphous alloys with the right chemical composition can be considerably improved with controlled heat treatment. This is due to the formation of a nanocrystalline phase, and leads to random distribution of material and magnetic anisotropy. The initial transformation in the amorphous phase depends on temperature, chemical composition and the process[8,9]
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