Near Room Temperature Magnetocaloric Response of an (FeNi)ZrB Alloy

Abstract

Mechanical alloying of Fe NiZr B powders leads to the formation of a -FeNi phase. In order to obtain single -phase, a powdered sample was solution annealed in the -phase field and water quenched. The Curie temperature of this powder was slightly higher than room temperature. The refrigerant capacity calculated for this alloy, kg for 5 T, is comparable to other prominent room temperature magnetocaloric materials, making this alloy a good candidate for magnetic refrigeration near room temperature with additional benefits that is non-rare earth containing and less expensive than many alternatives.

MAGNETIC PROPERTIES AND MAGNETOCALORIC EFFECT OF Fe90-xPrxZr10 RAPIDLY QUENCHED ALLOYS

“…Except for the XRD peak of the sample with x = 3, which is a litle bit sharp, the other ones are broad, characterizing for nearly-full amouphous structure in the alloy ribbons. As reported [1][2][3][4]9], the magnetic phase transition temperature (Curie temperature) of the Fe-based alloys could be lowered to room temperature region by making their structure amouphous. On the other hand, coercive force of amorphous structure is also smaller than that of cystalline structure.…”

“…One of the most typical materials is amorphous alloys. Among amorphous alloys, Fe-Zr based rapidly quenched alloys are of particular interests as they have giant magnetocaloric effect (GMCE), broad S m peak around the Curie temperature T C , low coercivity, high resistivity, no toxicity and low price [5][6][7][8][9]. For example, the Curie temperature of Fe 90-x Y x Zr 10 alloy is increased from 225 K (for x = 0) to 395 K (for x = 10) with increasing the concentration of Y [5].…”

Analysis of the Magnetocaloric Effect in Powder Samples Obtained by Ball Milling

“…Among RE-based materials Gd 5 Si 2 Ge 2 , [13,14] La(FeSi) 13 , [15][16][17][18] RE 2 Fe 17 intermetallics, [19,20] clathrates Eu 8 Ga 16 Ge 30 , [21] and amorphous alloys [13,14,22] can be found. Among TM-based systems Heusler alloys, [23][24][25] MnAs, [26][27][28][29] cFeNi, [30][31][32] and amorphous alloys [33][34][35][36][37] can be found. A general difference found in BM samples regarding their MCE with respect to that of bulk counterparts is a decrease of the DS M peak but a temperature broadening of the MCE response, which can lead to an enhancement of the refrigerant cooling power.…”

High temperature x ray diffraction determination of the body-centered-cubic–face-centered-cubic transformation temperature in (Fe70Ni30)88Zr7B4Cu1 nanocomposites

“…Moreover, it is known that Fe-based alloys prepared by rapid solidification techniques exhibit good soft magnetic properties [1][2][3] and applicability in magnetic devices as motors, generators, transformers, sensors, 1 and, more recently, for magnetic refrigeration. [4][5][6] Recently, the magnetocaloric effect 7 (MCE) has spurred much research activity worldwide, with the objective to develop compositions exhibiting large magnetocaloric response.…”

“…We have shown it is possible to obtain a single c-FeNi phase by high-energy mechanical alloying. 6 Given the interest in the metastable c-phase in the Fe-rich region of the Fe-Ni system for magnetocaloric applications, we have undertaken study of the alloys produced by primary nanocrystallization of amorphous precursors. We describe studies of the structural phase evolution of melt-spun FeNiZrBCu amorphous alloy using in situ high-temperature x ray diffraction and magnetic measurements to understand the metastable phase evolution with time.…”