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Magnetocaloric cooling offers the potential to improve the efficiency ofrefrigeration devices and hence cut the significant CO2 emissions associatedwith cooling processes. A critical issue in deployment of this technology isthe mechanical degradation of the magnetocaloric material during processing andoperation, leading to limited service-life. The mechanical properties ofhydrogenated La(Fe,Mn,Si)13-based magnetocaloric material are studied usingmacroscale bending tests of polycrystalline specimens and in situ micropillarcompression tests of single crystal specimens. The impact of hydrogenation onthe mechanical properties are quantified. Understanding of thedeformation/failure mechanisms is aided by characterization with transmissionelectron microscopy and atom probe tomography to reveal the arrangement ofhydrogen atoms in the crystal lattice. Results indicate that the intrinsicstrength of this material is ~3-6 GPa and is dependent on the crystalorientation. Single crystals under compressive load exhibit shearing alongspecific crystallographic planes. Hydrogen deteriorates the strength ofLa(Fe,Mn,Si)13 through promotion of transgranular fracture. The weakeningeffect of hydrogen on single crystals is anisotropic; it is significant uponshearing parallel to the {111} crystallographic planes but is negligible whenthe shear plane is {001}-oriented. APT analysis suggests that this isassociated with the close arrangement of hydrogen atoms on {222} planes.

The effect of hydrogen on the multiscale mechanical behaviour of a La(Fe,Mn,Si)13-based magnetocaloric material