Effects of crystallization treatment on the structure and magnetic properties of Gd65Fe25Zn10 alloy ribbons for magnetic refrigeration

Zhong, Xichun; Mo, Haijun; Huang, Xinjian; Shen, X. Y.; Feng, X.L.; Jiao, Dongling; Liu, Zhongwu

doi:10.1016/j.jallcom.2017.09.321

Cited by 5 publications

(3 citation statements)

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“…Compared with SOMT conventional magnetocaloric amorphous alloys based on a single principal element [59][60][61][62][63][64], at least 2-fold improvement in S M max and RCP is found for our work. More than 10% larger S M max (up to 8-fold) is observed when comparing our annealed HE-MG microwires to the conventional alloys exhibiting coexistence of amorphous and nanocrystalline phases [1, 34,[65][66][67][68][69][70]. Among the SOMT magnetocaloric HEA reports, a recent review paper [24] highlights that RE-containing HEAs concentrate at low temperatures while RE-free ones perform at higher temperatures, although with very compensated magnetocaloric responses (Fig.…”

Section: Discussionmentioning

confidence: 78%

“…Furthermore, the appearance of some nanocrystals leads to minor compositional difference between the amorphous matrix and nanocrystalline phase, leading to the widening of the T C distribution and improving the relative cooling power (RCP) by 7%. MCE enhancement is found for conventional alloys exhibiting amorphous/nanocrystalline dual-phase structures [6, [30][31][32][33][34][35], whereby those Gd-based compositions show an improve-ment of up to ~84% and ~21% in the values of maximum magnetic entropy change ( S M max ) and refrigeration capacity (RC) (for 5 T), respectively. In particular, a very recent report by Feng et al…”

Section: Introductionmentioning

confidence: 99%

“…In order to further explore the specific influence of the nanocrystalline phase on the MCE properties and critical behavior of HE-MGs, it is essential to increase the content of the nanocrystals. This can be effectively achieved in amorphous alloys through heat-treatment [36] in a protective atmosphere [34,35], magnetic field [37], stress condition [38], and by using current annealing [33,39]. Among these techniques, direct current (DC) Joule current annealing is more suitable for annealing metallic-glass microwires [33], as its characteristics, such as precisely tunable and controllable processing parameters, could prevent the microwires from becoming brittle.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the magnetocaloric response of high-entropy metallic-glass by microstructural control

et al. 2021

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Non-equiatomic high-entropy alloys (HEAs), the second-generation multi-phase HEAs, have been recently reported with outstanding properties that surpass the typical limits of conventional alloys and/or the first-generation equiatomic single-phase HEAs. For magnetocaloric HEAs, non-equiatomic (Gd36Tb20Co20Al24)100−xFex microwires, with Curie temperatures up to 108 K, overcome the typical low temperature limit of rare-earth-containing HEAs (which typically concentrate lower than around 60 K). For alloys with x = 2 and 3, they possess some nanocrystals, though very minor, which offers a widening in the Curie temperature distribution. In this work, we further optimize the magnetocaloric responses of x = 3 microwires by microstructural control using the current annealing technique. With this processing method, the precipitation of nanocrystals within the amorphous matrix leads to a phase compositional difference in the microwires. The multi-phase character leads to challenges in rescaling the magnetocaloric curves, which is overcome by using two reference temperatures during the scaling procedure. The phase composition difference increases with increasing current density, whereby within a certain range, the working temperature span broadens and simultaneously offers relative cooling power values that are at least 2-fold larger than many reported conventional magnetocaloric alloys, both single amorphous phase or multi-phase character (amorphous and nanocrystalline). Among the amorphous rare-earth-containing HEAs, our work increases the working temperature beyond the typical <60 K limit while maintaining a comparable magnetocaloric effect. This demonstrates that microstructural control is a feasible way, in addition to appropriate compositional design selection, to optimize the magnetocaloric effect of HEAs.

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