Abstract
In this study, we have proposed an anisotropic microstructure in La-Fe-Si magnetocaloric composites for thermal management. This is vital to the rapid heat exchange and high working efficiency in magnetic refrigerator system. We demonstrate the anisotropic microstructure in composites can be fabricated via powder metallurgy in this work. By adjusting the particle size of the 1:13 phase, the introduced reinforcing phase with rheological property can effectively deform and anisotropic microstructure can be obviously observed. This can be attributed to the tailored stress distribution in cubic-anvil-type pressure apparatus. The element diffusion between the two phases was also discussed in this paper, taking into account the influence of particle size. Such anisotropic microstructure causes some other anisotropic physical properties in the composite, such as mechanical strength. The compressive measurements along the axial direction exhibit superior mechanical properties (~ 3.5% for strain and ~ 350 MPa for strength) compared to those along the radial direction. Attributed to the stress buffer-effect provided by the introduced ductile phase, magnetocaloric effect (magnetic entropy change ~ 7.8 J/kg K) can be maintained in the La-Fe-Si composite.
Article Highlights
La-Fe-Si magnetocaloric composite with an anisotropic microstructure was successfully fabricated via hot pressing in a cubic-anvil-type pressure apparatus.
Deformation of the reinforcing phase and anistropic microstructure in composite are well-related to the effectively tailored stress distribution, which is achieved by tuning particles size of 1:13 phase.
This study unveils the potential to tailor microstructure by utilizing physical property (rheology) of reinforcing phase and changes of external field change (such as pressure).
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Details
1 Nanjing University of Science and Technology, School of Materials Science and Engineering, Nanjing, China (GRID:grid.410579.e) (ISNI:0000 0000 9116 9901)