Numéro
J. Phys. IV France
Volume 05, Numéro C8, Décembre 1995
International Conference on Martensitic Transformations – ICOMAT 95
Page(s) C8-415 - C8-420
DOI https://doi.org/10.1051/jp4:1995862
International Conference on Martensitic Transformations
ICOMAT 95

J. Phys. IV France 05 (1995) C8-415-C8-420

DOI: 10.1051/jp4:1995862

The Mechanism of Thermomechanical Training of a Newly Developed Fe-Mn-Si-Cr-Cu Shape Memory Alloy

D.P. Dunne and H. Li

Department of Materials Engineering, University of Wollongong, Wollongong, NSW 2522, Australia


Abstract
Thermomechanical training was carried out on a newly developed Fe-20Mn-6Si-7Cr-1Cu shape memory alloy. It was observed that the effectiveness of thermomechanical training largely depends on the recovery annealing temperature and the pre-strain during training. Based on the analysis of the changes in critical stress for martensite formation, the critical stress for slip deformation, the phase transformation temperatures and microstructural development during training, it was concluded that the mechanism of thermomechanical training is based on the following two factors : (1) lowering of the critical stress for martensite formation, making stress induced γ→ε transformation easier ; and (2) decreasing the Af temperature and refining the ε martensite structure, thus reducing the energy barrier for the ε→γ reverse transformation. The optimum thermomechanical training conditions have been determined for the alloy studied.



© EDP Sciences 1995