Autori: B. Pricop, U. Söyler, R. I. Comaneci, B. Özkal, L. G. Bujoreanu

Editorial: Manfred Kohl and Volodymyr Chernenko, Physics Procedia, 10, p.125-131, 2010.

Rezumat:

Specimens from Fe-Mn-Si-Cr-Ni SMA, obtained by powder metallurgy and compacted through hot rolling, were subjected to
tensile loading-unloading cycles. The pseudoelastic parameters were determined based on recorded stress-strain curves, and their
variation tendency with increasing the number of mechanical cycles was discussed. The gauges of tensile specimens were cut
after mechanical cycling and were subjected to structural and dilatometric analysis. The structure was analyzed by XRD and
SEM, aiming to reveal mechanical cycling effects. The thermomechanical response on heating, of mechanically cycled
specimens, was recorded by dilatometry and revealed a tendency to enhance thermal expansion as an effect of increasing the
number of cycles. The microstructural changes, induced by mechanical cycling, consisted in the stress induced formation of ’
martensite.

Cuvinte cheie: Aliaje cu memoria formei; Metalurgia pulberilor; Incercarea la tractiune; Ciclare mecanica; Martensita indusa prin tensiune // Shape memory alloys; Powder metallurgy; Tensile testing; Mechanical cycling; Stress-induced martensite

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