J. Phys. IV France 112 (2003) 557
Time-dependent phenomena during martensite ageing of Cu-Al-Be shape memory alloyK. Sapozhnikov1, S. Golyandin1, S. Kustov1, J. Pons2, E. Cesari2 and M. Morin3
1 A.F. loffe Physico-Technical Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
2 Department of Physics, University of Balearic Islands, Ctra. Valldemossa km 7.5, 07071 Palma de Mallorca, Spain
3 GEMPPM, bâtiment 502, INSA de Lyon, avenue A. Einstein, 69621 Villeurbanne cedex, France
Martensite ageing effects have been studied in the martensitic pbase of a Cu-10.5wt%Al-0.5wt%Be alloy, exhibiting pronounced stabilization of martensite, by means of calorimetric studies and acoustic measurements. The latter were performed in the range of non-liner anelasticity for temperatures between 300 and 9 K and allowed one to investigate variations of the mobility of linear/planar defects of martensite (partial dislocations, intervariant boundaries) for different heat treatments and ageing times in the martensite state. The conclusion is drawn that martensite ageing includes homogeneous and heterogeneous components. The former occurs in the bulk of a sample, whereas the latter is localized in the vicinity of lattice defects such as intervariant boundaries and/or partial dislocations limiting stacking faults.
© EDP Sciences 2003