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Factors Influencing the Reversion of Stress-induced Martensite to Austenite in a Fe-Mn-Si-Cr-Ni Shape Memory Alloy

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

Autori: Leandru G. Bujoreanu, Sergiu Stanciu, Radu I. Comaneci, Markus Meyer, Vasile Dia, and Ciprian Lohan

Editorial: Springer, Journal of Materials Engineering and Performance, 18(5-6), p.500-505, 2009.

Rezumat:

It is well-known that one way shape memory effect (SME) in Fe-Mn-Si based shape memory alloys (SMAs) is related to the thermally-induced reversion of ε (hexagonal close packed, hcp) stress induced martensite (SIM) to γ (face centered cubic , fcc) austenite. In the case of an Fe-Mn-Si-Cr-Ni SMA this reverse martensitic transformation was analyzed in regards to the critical temperature for the beginning of austenite formation (As) in different states characterized by quenching temperature and permanent tensile strain. For this purpose dynamic mechanical analysis (DMA), dilatometry (DIL), differential thermal analysis (DSC) and optical microscopy (OM) were employed to determine the influence of quenching temperature and permanent tensile straining on SIM reversion to austenite during heating.

Cuvinte cheie: critical transformation temperature, Fe-Mn-Si base shape memory alloys, martensite reversion to austenite, stress-induced martensite, thermomechanical and thermodynamic response