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Trade-offs arising from Sn additions to the Cu-9Al-10Mn ferromagnetic shape memory alloy
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Resumo(s)
The addition of several alloying elements has been tested in Cu-Al-Mn alloys, aiming to obtain the best combination of properties, a common challenge in materials engineering. In this work, effects of Sn additions up to 6 wt.% to a Cu-9Al-10Mn shape memory alloy were evaluated by different characterization techniques after quenching in iced water. On the one hand, it was observed that Sn additions decrease the melting temperatures, the grain size, the temperatures for the martensitic reaction, and the shape memory effect. On the other hand, results also showed that Sn additions increase the corrosion resistance and the ferromagnetic behavior of the alloy. Furthermore, Sn additions result in a monophasic microstructure, constituted by an ordered derivative of the β phase, whose structure is like β1 and β3. Hypothesis for the variation of microhardness, martensite start (Ms) temperature, and the saturation magnetization were given, considering the atomic properties of the Sn atom. The main trade-off involved in the substitution of Cu by Sn in the Cu-9Al-10Mn-xSn (0 < x ≤ 6) quaternary alloys is the improvement of magnetic properties to the detriment of the mechanical ones.
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General Physics and Astronomy Fluid Flow and Transfer Processes