Two-way shape memory effect of an Fe-Mn-Si alloy

Influence of annealing temperature on the shape memory effect of Fe–14Mn–5Si–9Cr–5Ni alloy after training treatment

“…Two major reason for this are (a) the reduction of favorite sites for stress-induced ε martensite phase nucleation and making stress concentration around the grain boundaries [7,8,10] and (b) the increase in M s temperature following the reduction of driving force needed for stress-induced γ → ε → α transformation [3,7,10].…”

“…annealing temperature, cooling rate, pre-strain (percent/temperature) and number of training cycles [1,4,7]. Among the mentioned parameters, annealing temperature is a more effective parameter for control of SME in Fe-Mn-Si-Cr-Ni-based alloys [5,[7][8][9][10].…”

Production and Characterization of Stainless Steel Based Fe-Cr-Ni-Mn-Si(-CO) Shape Memory Alloys

“…For example, the grain size of the 5,O mm in dia. wire CrNi alloy heat treated at 1323W2400s was around 65pm, while for the CrNiCo alloy under the same conditions, was 180pu Tan Shiming et al, [21] working with Fe-Mn-Si polycrystalline alloy, showed that the larger the grain size the lower the shape memory recovery, ranging from 75% &ape recovery at 1 0 p grain size to 20% at 60~m. They attributed this shape memory decrease to the increase of perfect dislocation due to grain size increase.…”

Computer simulation of martensitic transformations

“…The reversibility of the elastic energy and frictional resistance vary with composition, transformation strains, transformation mechanism and material properties (e.g.,the critical resolved shear stress), etc., and can change with processing history. This is the reason that some alloys exhibit large thennoelasticity and others small, and why some alloys traditionally considered to be non-thermoelastic show thermoelastic features under certain conditions [35][36][37][38][39][40][41][42][43][44]. It is not surprising that some systems do not meets the strict conditions for either thermoelasticity or non-thermoelasticity and have mixed features.…”