Abstract
Two kinds of lamella phases were observed in the phase transformations during aging of Sm(Co0.695Fe0.2Cu0.08Zr0.025)7.2 magnets, which formed before and after the disappearance of microtwins respectively. Microtwins appeared with the precipitation of disordered 2:17R phases and disappeared with 2:17R phase ordering. Dy was introduced to investigate these transformations by stabilizing the 2:17H phases. A simplified atomic model was given to describe the formation of microtwins and a reasonable assumption was proposed as well to clarify the mechanism of these transformations.
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