Abstract
Fe-Mn-Si-Cr-Ni alloys are Fe-based shape memory alloys (SMA), which make use of the γ↔e stress induced martensitic transformation. In the present study, the effect of C addition on the shape memory effect was reported. The characterization of the martensitic transformation and the phase components was carried out by using light optical microscopy, X-ray diffraction, internal friction measurements and transmission electron microscopy (TEM). C is often mentioned to improve the shape memory behaviour. Present results show, however, an opposite effect. It is believed that the relative position between the deformation temperature and the M s temperature for the two alloys is of key importance when looking for an explanation for the presented experimental results. The lower M s temperature for the high C alloy causes more slip and less transformation of the austenite. The microstructural characterization showed a lower amount of formed e martensite during deformation for the high C alloy.
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