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Variation tendencies of tensile constrained recovery behaviour and associated structural changes during thermal cycling of a Fe-Mn-Si-Cr-Ni shape memory alloy

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: C. Lohan, B. Pricop, R. I. Comãneci, N. Cimpoeşu, L.-G. Bujoreanu

Editorial: INOE Publishing House, Optoelectronics and Advanced Materials-Rapid Communications, 4(6), p.816-820, 2010.


By means of tensile stress variation during heating-cooling, applied in each consecutive cycle, performed up to progressively higher strains, the constrained recovery behaviour of a Fe-15.8 Mn-3.8 Si-12.3 Cr-4.7 Ni (mass. %) shape memory alloy (SMA) was reported. During each cycle, temperature was increased from room temperature up to 453 K and decreased to room temperature, while keeping the specimen to a constant strain. The variation tendencies of tensile stress, developed during heating-cooling, with increasing both the number of cycles and the constant strain applied per each cycle, was evaluated and corroborated with structural changes. These changes were related to the occurrence of stress-induced martensite the relief variations of which were revealed, as well, at structural and sub-structural level.

Cuvinte cheie: Fe-Mn-Si-Cr-Ni shape memory alloys; tensile constrained recovery; thermal cycling; stress-induced martensite; substructure relief