Title :
Microstructure and Magnetocaloric Properties of LaFe11.8–xCoxSi1.2 Strip-Cast Flakes
Author :
Mingxiao Zhang ; Zhongtian Zhang ; Chun He ; Yanyan Shao ; Jian Liu ; Aru Yan
Author_Institution :
Key Lab. of Magn. Mater. & Devices, Ningbo Inst. of Mater. Technol. & Eng., Ningbo, China
Abstract :
Flake-like LaFe11.8-xCoxSi1.2 alloys were successfully prepared in kilogram quantities by a strip-casting technique. It is found that a large amount of NaZn13-type La(Fe,Co,Si)13 phase (above 95 vol.%) can form in LaFe11Co0.8Si1.2 strip-cast flakes annealed at 1323 K for 24 h. The resulting alloy exhibits a maximum entropy change of 8.4 J/kg K and negligible magnetic hysteresis under a field change of 0-2 T. In addition, the Curie temperature can be accurately tuned by adjusting the concentration ratio of the Fe/Co. Our results indicate that the strip casting is an effective way to produce high-performance La(Fe,Co,Si)13 materials for room-temperature magnetic cooling.
Keywords :
Curie temperature; annealing; casting; cobalt alloys; crystal microstructure; iron alloys; lanthanum alloys; magnetic hysteresis; magnetocaloric effects; silicon alloys; Curie temperature; LaFe11.8-xCoxSi1.2; annealing; flake-like alloys; magnetic hysteresis; magnetocaloric properties; maximum entropy change; microstructure; strip-cast flakes; temperature 1323 K; time 24 h; Annealing; Compounds; Entropy; Magnetic hysteresis; Magnetic resonance imaging; Metals; Strips; La-Fe-Co-Si alloys; La???Fe???Co???Si alloys; Magnetocaloric effect; Strip casting technique; magnetocaloric effect (MCE); strip-casting technique;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2439299
