Study of precipitate formation in Cu-Al-Ni-Mn-Fe shape memory alloys

The paper analyses the precipitation of gamma2 phase within the 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...

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Bibliographic Details
Published in:Journal of Optoelectronics and Advanced Materials 2008-06, Vol.10 (6), p.1365-1369
Main Authors: Stanciv, S, Bujoreanu, L-G, Ozkal, Burak, Ovecoglu, M Lutfi, Sandu, Andrei Victor
Format: Article
Language:English
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Summary:The paper analyses the precipitation of gamma2 phase within the 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 gamma2 phase precipitates, which are characterized by two specific morphologies, with dendrite arms at about 90 deg and a120 deg , respectively. In spite of the presence of gamma2 phase precipitates, the occurrence of thermal memory has been emphasized, characterized by shape recovery degrees higher than 96 %.
ISSN:1454-4164