Martensitic transformation and shape memory effect in Fe–Mn–Si based alloys

Temperature dependence of critical stress and pseudoelasticity in a Fe–Mn–Si–Cr pre-rolled alloy

“…The accepted mechanism for the fcc/hcp transformation considers stacking faults in fcc as nucleation sites for the martensite [8]. At room temperature, the stacking fault energy (SFE) is low [14,20], so existing stacking faults are expected to be rather long and new ones are easy to nucleate. When external stress is applied on the samples, existing stacking faults grow by accumulating elastic tension around.…”

“…Although the material has been the subject of several publications in the past [14], most of them were related to the research of an optimum training treatment. There are almost no mechanical properties studies involving the material optimized by the newly developed thermomechanical treatment.…”

Phase transformation during mechano-synthesis of nanocrystalline/amorphous Fe–32Mn–6Si alloys

“…Fe-Mn-Si alloys are a class of smart materials due to their suitable shape memory effect (SME), excellent machinability and formability, low cost, good weldability and corrosion resistance, and high strength having several industrial applications such as dampers, pipe couplings, big shape memory devices, hard metals or alloys joining, oxygen blowing nozzles and so on [1][2][3][4][5][6][7][8][9][10][11]. The production of stress induced martensite (ε, hcp) from parent austenite phase (γ, fcc) and the reverse transformation (γ to ε) during the heating cycle are the origins of SME in this alloying system [12][13][14][15][16][17][18].…”

Further improvement of shape memory effect in a pre-deformed Fe–Mn–Si–Cr–Ni–Nb–C alloy by smaller NbC precipitated through electropulsing treatment

“…The electropulsing procedure was performed under ambient conditions, by capacitor discharge (5000 s, 300/200 V) with automatic triggering. The current density, j, was 4/2.5 × 109 A/m 2 ; the pulse duration, tp, was 400 s. The critical stress of room temperature plastic deformation was measured by extrapolation as described in reference [17]. The shape recovery ratio was determined by bending test as described in reference [18].…”