High-temperature phase transition behavior and magnetocaloric effect in a sub-rapidly solidified La-Fe-Si plate produced by centrifugal casting

doi:10.1016/j.jmst.2017.11.023

Abstract

Abstract:

A sub-rapidly solidified LaFe_11.6Si_1.4 plate was fabricated directly from liquid by centrifugal casting method. The phase constitution, microstructure and magnetocaloric effect were investigated using backscatter scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and physical property measurement system. When the plate was annealed at 1373 K, τ1 phase was formed by a solid-state peritectoid reaction. A first-order magnetic phase transition occurred in the vicinity of 188 K, and the effective refrigeration capacities reached 203.5 J/kg and 209.7 J/kg in plates annealed for 1 h and 3 h, respectively, under a magnetic field change of 3 T. It is suggested that centrifugal casting may become a new approach to prepare high-performance La-Fe-Si magnetocaloric plates for practical applications, which could largely accelerate the formation of τ1 phase during high-temperature heat-treatment process due to refined and homogeneous honeycombed microstructure.

Key words: La-Fe-Si, Magnetocaloric effect, Rapid solidification, Centrifugal casting, Phase transition

Zhishuai Xu, Yuting Dai, Yue Fang, Zhiping Luo, Ke Han, Changjiang Song, Qijie Zhai, Hongxing Zheng. High-temperature phase transition behavior and magnetocaloric effect in a sub-rapidly solidified La-Fe-Si plate produced by centrifugal casting[J]. J. Mater. Sci. Technol., 2018, 34(8): 1337-1343.

Figures/Tables 10

Fig. 1. Schematic diagram of the centrifugal casting setup (a) and image of the produced plate (b).

Fig. 2. Backscatter SEM image of arc-melted LaFe11.6Si1.4 alloy.

Fig. 3. Backscatter SEM images of LaFe11.6Si1.4 plates: (a, b) RP0, (d) RP1 and (e) RP3. (c) A topological morphology showing La5Si3 phase close to shrinkage cavities in RP0, and the curves in the right represent the depth change measured from 4 typical zones.

Table 1 Average chemical composition (at.%) and volume fraction (vol.%)a for each phase in the LaFe11.6Si1.4 plate.

	α(Fe)			LaFeSi				τ1
	Fe	Si	vol.%	La	Fe	Si	vol.%	La	Fe	Si	vol.%
RP0	93.0	7.0	69.3	30.0	36.5	33.5	30.7	-	-	-	0
RP1	95.3	4.7	17.6	26.7	38.6	34.7	6.3	6.5	80.8	12.7	76.1
RP3	95.6	4.4	6.4	27.2	40.8	32.0	3.8	6.8	81.6	11.6	89.8

Fig. 4. XRD patterns of LaFe11.6Si1.4 plates at room temperature.

Fig. 5. DSC curve of the sub-rapidly solidified LaFe11.6Si1.4 plate (20 K/min).

Fig. 6. (a) Backscatter SEM image of sub-rapidly solidified LaFe11.6Si1.4 plate annealed at 1423 K for 1 h. (b) EDS measurements taken from the grey matrix, white and black particles, showing τ1, (La,Fe)5Si3 and α(Fe) phases, respectively. The average chemical compositions (at.%) for each phase are added on the EDS spectra.

Fig. 7. Magnetization curves of annealed LaFe11.6Si1.4 plates upon heating and cooling under a magnetic field of 0.05 T. Insets are the dM/dT plots upon heating.

Fig. 8. (a, b) Selected isothermal magnetization curves under a magnetic field change of 3 T and (c, d) the Arrot plots around the magnetic transition of annealed LaFe11.6Si1.4 plates.

Fig. 9. Magnetic entropy change values as a function of temperature for annealed LaFe11.6Si1.4 plates.

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