| Numéro |
J. Phys. Colloques
Volume 43, Numéro C4, Décembre 1982
ICOMAT-82International Conference on Martensitic Transformations |
|
|---|---|---|
| Page(s) | C4-485 - C4-490 | |
| DOI | https://doi.org/10.1051/jphyscol:1982475 | |
ICOMAT-82
International Conference on Martensitic Transformations
J. Phys. Colloques 43 (1982) C4-485-C4-490
DOI: 10.1051/jphyscol:1982475
1 Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, L.A. 341, Bâtiment 502, I.N.S.A. de Lyon, 69621 Villeurbanne Cedex, France
2 Laboratoire d'Etudes des Matériaux E.R.A. 602, Bâtiment 303, I.N.S.A. de Lyon, 69621 Villeurbanne Cedex, France
International Conference on Martensitic Transformations
J. Phys. Colloques 43 (1982) C4-485-C4-490
DOI: 10.1051/jphyscol:1982475
ELECTRICAL EMISSION ASSOCIATED WITH THE MARTENSITIC BURST OF Fe - Ni ALLOY
M. Robin1, G. Lormand2 et P.F. Gobin11 Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, L.A. 341, Bâtiment 502, I.N.S.A. de Lyon, 69621 Villeurbanne Cedex, France
2 Laboratoire d'Etudes des Matériaux E.R.A. 602, Bâtiment 303, I.N.S.A. de Lyon, 69621 Villeurbanne Cedex, France
Abstract
Fast response optical reflectivity and electrical voltage measurements show that, in a Fe-32wt%. Ni alloy, the martensitic transformation begins by a single big burst within a few µs. When a d.c. current flows through the sample, the electrical signal linked to the burst presents a negative time-voltage integral and HF oscillations. The time-voltage integral is well explained by the bulk electromagnetic effects of the transformation. We have shown that a moving austenite-martensite interface must create electrical currents inside the sample and therefore explain the H.F. oscillations. For a burst, a computer-simulated signal has been obtained and agrees rather well with the experimental one.