Abstract
The development of high-performance magnetocaloric material is one of the keys to actualize the room-temperature magnetic refrigeration technology. Here the effects and mechanisms of solidification behaviors and microstructures on the magnetocaloric effect (MCE) of AlFe2B2 intermetallics are investigated. The solidification behaviors of AlxFe2B2 (x = 1.0, 1.2, 1.4, 1.6, and 1.8) were regulated via controlling the content of Al element, that is, peritectic reaction for x < 1.4 and direct crystallization for x ≥ 1.4. The magnetic entropy changes under an applied magnetic field of 5 T of AlFe2B2 intermetallics prepared by peritectic reaction can reach 7.2 J kg−1K−1 near room-temperature, which is much larger than that of direct crystallization samples (~5 J kg−1K−1). The reason is attributed to the abrupt change of crystal cells and its effect on the magnetoelastic coupling. The present work provides a new perspective to accurately control the MCE of AlFe2B2 phase, which is beneficial for its further practical application.
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