Abstract
Alloying elements play an important role in adjusting the magnetic and thermal properties of Fe-based amorphous alloys. In this work, the effect of Mo addition on the thermal stability, structural evolution, and magnetic properties of Fe76Si9B10P5 metallic glass was studied. The study revealed that the substitution of a small amount of Mo (1 at.%) for Si enhances the glass-forming ability (GFA) but reduces the thermal stability of the alloy, causing a reduction of the supercooled liquid region. Substitution of up to 3 at.% Mo for Si lowers the Curie temperature from 677 to 550 K and the saturation magnetization drops from 160 to 138 Am2/kg. The structural evolution was evaluated by annealing the glassy samples at different temperatures, revealing that the crystallization proceeds in multiple steps, beginning with the formation of different iron borides (FeB, Fe2B, FeB2 and Fe23B6) followed by transformation to a mixture of more stable phases.
Highlights
Since the discovery of amorphous alloys [1], a wide variety of systems have been developed in the continuous search for a good combination of properties
It can be deduced that there is a poor correlation between the parameters used to measure the glass-forming ability (GFA) and the results reported by Zhang et al [21], who found an increase in the GFA
The analysis of the structural evolution of the Fe76Si9B10P5 alloy with the addition of small amounts of Mo substituting subsequently decomposes into α-Fe (Si) shows that this alloy system presents a multistage crystallization process
Summary
Since the discovery of amorphous alloys [1], a wide variety of systems have been developed in the continuous search for a good combination of properties. A wide variety of alloy systems have been developed searching for a virtuous combination of good soft magnetic properties and good GFA; it has been reported that the proper addition of some elements like Al, Ga, Nb, Zr, Ni, and Er to Fe-based alloys may improve the GFA of the systems, as well as vary mechanical, physical and magnetic properties [4,5,6,7]. Most of these elements are rare and expensive, and in most cases, result in considerable effects on other properties [8]. Makino et al [9,10]
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