Open Access
Article Number 06022
Number of page(s) 6
Section Applied Research and Applications: Testing and Modelling
Published online 01 September 2009
ESOMAT 2009, 06022 (2009)
DOI: 10.1051/esomat/200906022

Effect of thermomechanical training on the transformation temperatures and properties of NiTi melt-spun ribbons

K. Mehrabi1, M. Bruncko1, 2 and A. C. Kneissl1

1  Department of Physical Metallurgy and Materials Testing, University of Leoben, Austria
2  Faculty of Mechanical Engineering, University of Maribor, Slovenia

Published online: 1 September 2009

The present work aims to study the influence of thermomechanical training and two-way shape memory effect (TWSME) on the transformation behaviour of Ni-50.3 at. % Ti melt-spun ribbons by differential scanning calorimetry (DSC). The results showed that the transformation temperatures decrease with an increase in the number of thermal cycles. The austenitic transformation remains a one-stage transformation, while the martensitic transformation changes to a two-stage transformation. These changes are due to the appearance of an intermediate phase which was stabilized probably by the accumulation of defects introduced by thermomechanical training. The phase that is present after training was studied by X-ray diffraction and transmission electron microscopy.

© Owned by the authors, published by EDP Sciences 2009