| Issue |
J. Phys. Colloques
Volume 43, Number C4, Décembre 1982
ICOMAT-82International Conference on Martensitic Transformations |
|
|---|---|---|
| Page(s) | C4-267 - C4-272 | |
| DOI | https://doi.org/10.1051/jphyscol:1982436 | |
International Conference on Martensitic Transformations
J. Phys. Colloques 43 (1982) C4-267-C4-272
DOI: 10.1051/jphyscol:1982436
MECHANICAL PROPERTIES OF THE COLD-WORKED MARTENSITIC NiTi TYPE ALLOYS
O. Mercier1, 2 et E. Török1, 31 Brown Boveri Research Center, CH-5400 Baden, Switzerland
2 Swiss Federal Institute for Reactor Research, CH-5303 Würenlingen, Switzerland
3 Institut Straumann, CH-4437 Waldenburg, Switzerland
Abstract
Recently, it has been shown that the cold-worked NiTi alloy has unusual pseudo-elastic properties in the martensite phase. In this communication further mechanical properties of NiTi and NiTiCu alloys in the cold-worked state are presented. It is shown that both have a higher elastic limit, a higher ultimate tensile stress and a different behaviour during the plastic deformation (i-e a large necking is observed) than the annealed alloys. These unusal mechanical properties have been explained in large part in terms of dislocation - dislocation and dislocation-martensite interface interactions. However some observed features are only understood if, in addition, the premartensitic phase (R-phase) is present and active during the phase transformation.