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Autori: S. STANCIU, L.-G. BUJOREANU, BURAK ÖZKAL, M. LUTFI ÖVEÇOGLU, ANDREI VICTOR SANDU
Editorial: JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS, Vol. 10, No. 6, June, p.1365-1369, 2008.
The paper analyses the precipitation of γ2 phase within the γ’1 thermally induced martensitic matrix of five Cu-Al-Ni-Fe-Mn
shape memory alloys (SMAs), by means of differential scanning calorimetry (DSC) thermograms, optical microscopy (OM)
and scanning electron microscopy (SEM). It has been proved that the flat exothermic peaks, occurring during the heating of
martensitic specimens, correspond to the formation of γ2 phase precipitates, which are characterized by two specific
morphologies, with dendrite arms at about 900 and a1200, respectively. In spite of the presence of γ2 phase precipitates, the
occurrence of thermal memory has been emphasized, characterized by shape recovery degrees higher than 96 %
Cuvinte cheie: Shape memory alloys, Martensite, Phase structure, Critical temperatures, Precipitates