Effects of heat treatment on the microstructures and magnetic properties of Co28Fe28Ni19Si13B12 high-entropy amorphous toroidal core
Source abstract
Abstract
The microstructures and magnetic properties of Co 28Fe 28Ni 19Si 13B 12 high-entropy amorphous toroidal cores are investigated by X-ray diffractometer (XRD), transmission electron microscopy (TEM), MATS-2010 SD/MATS-2010SA soft magnetic DC (AC) tester, WK6500B LCR bridge and precision LCZ tester. The results indicate that the alloy combines high curie temperature ( T c ) and excellent soft magnetic properties. After heat treatment, the Co 7Fe 3 phase first precipitates in the alloy, and then follows the lamellar precipitate as Fe-B and Ni-Si phase. At elevated temperatures, the Co 7Fe 3 phase is transformed into the (Ni, Fe) phase with a precipitation of the Co 2 B phase. Compared to normal annealing (NA), the ordered rearrangement of domains induced by the magnetic field during heat treatment simplifies the domain structure and significantly improves the magnetic properties. Following stepwise longitudinal magnetic field annealing (NA+LFA), rectangular hysteresis loops are formed through domain movement, enhancing saturation induction ( B s ) and remanence ratio, while reducing coercivity ( H c ) and permeability. Conducting stepwise transverse magnetic field annealing (NA+TFA) increases permeability, maintains constant magnetic conductivity, reduces losses, and the ability to resist external direct current (DC) field interference is greatly enhanced.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High Entropy Alloys Studies · Metallic Glasses and Amorphous Alloys · Additive Manufacturing Materials and Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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