Abstract
Fe-based magnetic metallic amorphous and nanocomposites have excellent soft magnetic properties including greater magnetization and magnetic permeability compared with crystalline alloys, especially at high operation frequency and temperature. The high magnetic field (HMF) up to 12T is introduced to the heat annealing of Fe71(Nb0.8Zr0.2)6B23 bulk metallic glass (BMG). The 12T HMF annealing shows the effect of improve the thermal stability of amorphous state during annealing in the BMG's supercooled liquid region as compared with the annealing without magnetic field. The HMF annealing inhibits the brittleness of BMG during the structural relaxation, due to the increment of the activation energy under the HMF. The HMF annealing also results in squared hysteresis loops after the structural relaxation and lower coercivity.
Highlights
In the past decades, Fe-based bulk metallic glasses (BMGs) with a high glass forming ability (GFA) have become a very hot research topic because of their soft-magnetic properties and the high fracture strength and corrosion resistance[1,2,3,4,5]
The results show that high magnetic field (HMF) can improve the thermal stability of amorphous state during annealing in the BMG’s supercooled liquid region as compared with the annealing without magnetic
The differential scanning calorimeter (DSC) curves of the samples both annealed at 500 °C for 60 min with or without a 12 T magnetic field are shown in Figure 1, which exhibit the significant endothermic characteristics of a glass transition followed by an exothermic peak almost with the same exothermic heat amount of the as-cast rod indicating the normally full amorphous structure after the low temperature annealing
Summary
Fe-based bulk metallic glasses (BMGs) with a high glass forming ability (GFA) have become a very hot research topic because of their soft-magnetic properties and the high fracture strength and corrosion resistance[1,2,3,4,5]. These BMGs can be obtained directly either from the liquid or the deformation within the supercooled liquid region in the final shape suitable for various applications in different devices, such as magnetic sensors, magnetic valves, and magnetic clutches etc. The results show that HMF can improve the thermal stability of amorphous state during annealing in the BMG’s supercooled liquid region as compared with the annealing without magnetic
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