Physics – Condensed Matter – Materials Science
Scientific paper
2011-01-25
Physics
Condensed Matter
Materials Science
18 pages, 9 figures
Scientific paper
10.1016/j.actamat.2011.11.040
Tensile stress-strain behavior of Ni57.5Mn22.5Ga20.0 single crystal exhibiting a high-temperature 2M-martensitic phase stable up to 360\degree C has been studied in the course of thermal and mechanical cycling. The ultra-large reversible strains, about 9%, caused by the shape memory and superelasticity effects, have been observed up to 400 \degree C being the instrumental temperature limit. Abnormally large two-way shape memory effect with 9% of strain magnitude has been found. The cycling procedure and the variation of thermal/mechanical routs of the training of samples revealed the destabilization (rejuvenation) of martensite. This physical effect is opposite to the well-known phenomenon of martensite stabilization. A destabilization effect is explained phenomenologically in terms of internal stressing of the alloy sample by the crystal defects.
Barandiaran J. M.
Besseghini S.
Chernenko A. V.
Lvov V. A.
Villa Elena
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