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Numéro
J. Phys. IV France
Volume 01, Numéro C4, Novembre 1991
EUROPEAN SYMPOSIUM ON MARTENSITIC TRANSFORMATION AND SHAPE MEMORY PROPERTIES
Page(s) C4-445 - C4-450
DOI http://dx.doi.org/10.1051/jp4:1991467
EUROPEAN SYMPOSIUM ON MARTENSITIC TRANSFORMATION AND SHAPE MEMORY PROPERTIES

J. Phys. IV France 01 (1991) C4-445-C4-450

DOI: 10.1051/jp4:1991467

MICROSTRUCTURE AND SHAPE-MEMORY-PROPERTIES OF THERMO-MECHANICAL TREATED Fe-Ni-Co-Ti-ALLOYS

N. JOST

Institut für Werkstoffe, Ruhr-Universität Bochum, Postfach 10 21 48, D-4630 Bochum 1, Germany


Abstract
It has been shown that ausaged Fe-Ni-Co-Ti alloys exhibit shape-memory effects with a reversible martensitic transformation and a small temperature hysteresis between the forward and the reverse transformation. This is due to the precipitation of small coherent (Ni,Co,Fe)3Ti particles which lead on the one hand to a very effective hardening of the austenite and on the other hand to high elastic back stresses after shearing together with the martensite into a metastable structure. A combined thermomechanical treatment with homogeneously distributed dislocations can favour the homogeneous distribution of the particles. In this case, the obtainable shape memory effect can reach a maximum. Mechanical and thermal properties were studied by means of hardness and dilatometric measurements. The microstructures before and after the martensitic transformation were investigated by optical microscopy. In order to proof the reversibility of the shape memory effect, springs of different dimensions were produced and their behaviour during the training and under different loads were investigated.



© EDP Sciences 1991