Abstract
The service life and reliability of Sm2Co17-type permanent magnets in high-temperature energy conversion fields are significantly deteriorated due to their mechanical fragility. Herein, the deformation mechanisms of a strongly anisotropic Sm2Co17-type magnet are probed. Nanoindentation results suggest a weak anisotropy of hardness while a strong anisotropy of incipient plasticity related to crystal orientations, namely the nucleation of atomic shear bands working as plastic carriers is the easiest on {101̅0} planes but most difficult on {0001} planes. A statistical model on the critical shear stress of incipient plasticity indicates that the generation of shear band embryos is mainly processed via homogeneous nucleation from bond breakage. Transmission electron microscopy and ab initio calculations confirm that atomic bands along the pyramidal {011̅1} or basal {101̅0} planes primarily accommodate the deformation for loading direction along or perpendicular to the c-axis, respectively. The thickness of the {011̅1} and {101̅0} shear bands are in the range of 2–4 atomic layers. Nevertheless, due to the blocking effects of 1:3R Z-platelets and 2:17R twins on the progress of {011̅1} shear bands, the lengths of {011̅1} shear bands are much shorter than {101̅0} bands. Our work offers insights into the atomic-scale deformation mechanisms of Sm2Co17-type magnets.
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