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Superelastic Effect in Polycrystalline Ferrous Alloys

Science  01 Jul 2011:
Vol. 333, Issue 6038, pp. 68-71
DOI: 10.1126/science.1202232

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Abstract

In superelastic alloys, large deformation can revert to a memorized shape after removing the stress. However, the stress increases with increasing temperature, which limits the practical use over a wide temperature range. Polycrystalline Fe-Mn-Al-Ni shape memory alloys show a small temperature dependence of the superelastic stress because of a small transformation entropy change brought about by a magnetic contribution to the Gibbs energies. For one alloy composition, the superelastic stress varies by 0.53 megapascal/°C over a temperature range from –196 to 240°C.

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