Plastically deformed La-Fe-Si: Microstructural evolution, magnetocaloric effect and anisotropic thermal conductivity

La(Fe,Si)(13)-based alloys are considered to be one of the most promising magnetocaloric materials for solid state cooling. However, the intrinsic brittleness of NaZn13-type functional phase (1:13 phase) obstructs the shaping of La-Fe-Si alloys into desired geometries for the applications in magnetic cooling devices. Here, by exploiting the excellent deformability of alpha-Fe phase, we propose a near-net shaping method of open die-forging to prepare La-Fe-Si thin plates. This novel approach is demonstrated for the first time to exhibit several advantages including producing full-dense materials, facilitating the phase formation, and maintaining large magnetocaloric effect. The microstructural and texture evolution have been systematically investigated for the pre-deformed and annealed La-Fe-Si alloys. Large magnetic entropy change of 14 J/kg K at 2 T is obtained in the annealed sample and 11 J/kg K for the hydrogenated sample without hydrogen-induced cracking. Furthermore, a unique dual-phase structure consisting of aligned alpha-Fe phase and non-equiaxial 1:13 grains brings about the significant anisotropic thermal conductivity in cross-plane and in-plane directions for the plastically-deformed plates. This new insight would greatly benefit the design of high efficient magnetic refrigerator with one-way enhanced thermal conduction. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.