Enhanced pseudoelasticity of an Fe–Mn–Si-based shape memory alloy by applying microstructural engineering through recrystallization and precipitation

The aim of this work is to provide a novel understanding pseudoelasticity mechanisms in an FeMnSi-based shape memory alloy and utilize the identified parameters control enhance mechanical behavior alloy. was processed by employing caliber rolling equivalent strain 0.25 at room temperature. Various heat treatments from 530 1000 °C were applied study microstructural evolution during short-term post-deformation annealing (PDA) aging. A minimum residual 2.85% achieved after 4% loading tension cold-worked sample 925 for 50 min followed aging 750 6 h; lowest ever reported Moreover, absorbed energy increased 17 22 J/cm 3 , indicating 30% enhancement compared with as-received aged sample. These improvements make more suitable seismic damping application providing recentering dissipation. are mainly attributed grain refinement, which stimulates uniform distribution precipitates inside austenite grains PDA Additionally, refinement modifies morphology size precipitates, resulting number stacking faults high volume fraction ε-martensite, diminishes probability intersection ε-martensite laths each other subsequent α′-martensite formation.