Unique layered microstructure and magnetocaloric effect in hot-rolled La-Fe-Co-Si plates
Source abstract
Abstract
Aiming to improve the heat transfer efficiency in active magnetic regeneration, this work for the first time has proposed hot rolling as a near-net-shape and up-scaled processing method to fabricate La-Fe-Si-based magnetocaloric plates. The composition of LaFe 11Co 0.8Si 1.2 alloys was rolled at 1273 K into 2 mm thickness with a reduction ratio of 31.0%. We observed a unique layered microstructure in the hot-rolled plate: there were apparent cracks and oxidation phenomenon occurred in the part close to the plate surface, but almost defects-free deformed microstructure in the inner part. Upon the homogenization annealing, the plate has a large magnetic entropy change of 6.1 J/kg K under an applied field change of 2 T around room temperature. Additionally, by using a self-developed infrared characterization technique we directly measured a reversible adiabatic temperature change of 1.6 K in 0–1.3 T field cycles.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Magnetic Properties of Alloys · Shape Memory Alloy Transformations
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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