The microstructural evolution of Fe-Mn-Si Shape Memory Alloys (SMAs) was monitored during the main stages of the classical technological flow: (1) casting; (2) homogenizing and (3) hot rolling. With increasing the plastic deformation degree, including by additionally elongating the hot rolled specimens, the increase of the amount of ε stress induced martensite (SIM) plates in the detriment if α’ SIM was revealed by means of optical and scanning electron microscopy. The tensile-stress variation was analysed during complex cycling by constrained recovery of a high-plasticity Fe-23.27 Mn-2.76 Si (wt.%) SMA, with a tensile strength about 670 MPa and an ultimate strain of 8 %. The cycles were composed of: (i) room temperature (RT) loading; (ii) RT partial unloading; (iii) constant strain heating; (iv) constant strain cooling and (v) RT unloading. During the cycles, characterized by average maximum stresses above 460 MPa and recovery stresses above 240 MPa, the observed stress-temperature evolution confirmed the four stage stress variation reported by literature [1]. In order to maintain the above stress levels, constrained-recovery strain had to be increased with an average of 0.5 % per cycle, between 2 and 4 %.

[1] Z.Z.Dong, S.Kajiwara, T.Kikuchi, T.Sawaguchi, Acta mater. 53 (2005) 4009-4018

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