Microstructure evolution, solidification characteristic and magnetocaloric properties of MnFeP0·5Si0.5 particles by droplet melting

Tu, Defang; Li, Jun; Zhang, Ruiyao; Hu, Qiaodan; Li, Jianguo

doi:10.1016/j.intermet.2021.107102

Cited by 7 publications

(1 citation statement)

References 43 publications

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“…However, these methods usually require time-consuming heat treatment (from several hours to several days) for achieving homogeneous compositions and forming high fractions of the Fe 2 P phase [9]. Alternatively, rapid solidification techniques, such as melt spinning [15,16] and droplet melting [17,18], enable the fabrication of materials with excellent compositional homogeneity and reduced impurities after short-time heat treatment. In this way, melt-extraction as a rapid solidification technique has been proposed as a promising method to develop wire-shaped magnetocaloric materials as reported for meltextracted Gd-based microwires [19,20] and more recently high-entropy alloys [21,22], as well as medium-entropy alloys [23].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Magnetocaloric Properties of Annealed Melt-Extracted Mn1.3Fe0.6P0.5Si0.5 Microwires

Luo

Law

Shen

et al. 2022

Metals

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The highly regarded Fe2P-based magnetocaloric materials are usually fabricated by ball milling, and require an additional extended annealing treatment at high temperatures (at temperatures up to 1423 K for several hours to days). In this work, we show that fabricating Mn1.3Fe0.6P0.5Si0.5 into the form of microwires attained 82.1 wt.% of the desired Fe2P phase in the as-cast state. The microwires show a variable solidification structure along the radial direction; close to the copper wheel contact, Fe2P phase is in fine grains, followed by dendritic Fe2P grains and finally secondary (Mn,Fe)5Si3 phase in addition to the dendritic Fe2P grains. The as-cast microwires undergo a ferro- to para-magnetic transition with a Curie temperature of 138 K, showing a maximum isothermal magnetic entropy change of 4.6 J kg−1 K−1 for a magnetic field change of 5 T. With further annealing, a two-fold increase in the maximum isothermal magnetic entropy change is found in the annealed microwires, which reveal 88.1 wt.% of Fe2P phase.

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