| Numéro |
J. Phys. IV France
Volume 112, October 2003
|
|
|---|---|---|
| Page(s) | 523 - 527 | |
| DOI | https://doi.org/10.1051/jp4:2003939 | |
J. Phys. IV France 112 (2003) 523
DOI: 10.1051/jp4:2003939
Stabilization of martensite in
microstructure of a Cu-Zn-AI shape-memory alloy
S. Longauer, M. Vojtko, G. Janak and M. Longauerova Department of Materials Science, Faculty of Metallurgy, Technical University of Kosice, Letna 9, 04200 Kosice, Slovak Republic
Abstract
Direct quenching of samples of Cu22Zn4.6A1 alloy from temperatures of an
-field to room temperature causes strong stabilization of martensite in samples with A
(the temperature at which transformation to austenite begins) above room temperature. This can be removed by immediate heating
of samples at 170°C after quenching from T
between 630 and 690°C. Shift of A
to the nominal value depends on time of annealing. In samples quenched from higher temperatures over 690°C the stabilization
was not removed. The observation of in situ deformation of martensite in upquenched samples supports the explanation [2] of
the decreasing shape memory with increasing quenching temperature by changes in stacking fault energy.
© EDP Sciences 2003