Abstract
The magnetisation behaviour of cyclically deformed and non-deformed Fe3Ge and Ni3Ge is examined at sufficiently low temperatures below the Curie point. Despite these two intermetallics having the same L12 structure, they are found to show quite different behaviour in their ferromagnetic properties; the spontaneous magnetisation (M S) remains unaffected in the former whereas it decreases notably in the latter after cyclic deformation. The origin of the difference is investigated and attributed to the difference in operative shear planes. These are mainly on {001} planes without the introduction of notable amounts of anti-phase boundary (APB) tubes in Fe3Ge and mainly on {111} planes with the introduction of a high density of APB tubes composed of {111} APBs in Ni3Ge. The effects of cyclic deformation on the high-field susceptibility χ and the coercive force (H C) are also discussed by taking into account the dislocation distributions introduced by the {001} and {111} slips.
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