Open AccessAssessing two rapid quenching techniques for the production of La‐Fe‐Si magnetocaloric alloys in reduced annealing time
Author(s) -
Potnis Gaurav,
Krautz Maria,
Waske Anja,
Das Jayanta,
Eckert Juergen
Publication year - 2019
Publication title -
material design & processing communications
Language(s) - English
Resource type - Journals
ISSN - 2577-6576
DOI - 10.1002/mdp2.96
Subject(s) - magnetic refrigeration , materials science , annealing (glass) , quenching (fluorescence) , metallurgy , magnetization , physics , optics , magnetic field , quantum mechanics , fluorescence
Abstract In the present study, we compare a La‐Fe‐Si‐based alloy doped with Mn, LaFe 11.7 Si 1.2 Mn 0.1 , cast by three different techniques leading to different microstructures. Arc melting, suction casting, and melt spinning are used to fabricate LaFe 11.7 Si 1.2 Mn 0.1 samples to analyze the influence of as‐cast microstructure and distribution of phases on annealing time required to obtain a magnetocaloric 1:13 phase. The microstructure and phase compositions of both the as‐cast and the annealed samples are analyzed by X‐ray diffraction and electron microscopy. We show that suction casting and melt spinning lead to a significant reduction of the annealing time from 7 days (conventionally cast samples) to 3 days and 1 day, respectively, to obtain the 1:13 phase as a major phase. In these samples, a magnetic entropy change of ∆ S M = 11 and 8 J/kg·K, respectively, is achieved in the vicinity of T C .