J. Phys. IV France 112 (2003) 397
DOI: 10.1051/jp4:2003910

Internal friction and some other properties of shape memory Fe-Mn-Si based alloys

P.G. Yakovenko¹, O. Söderberg², K. Ullakko³ and V.K. Lindroos<sup>2

1</sup>  Institute for Metal Physics, Laboratory of Thermo-Mechanical Treatment, 003680 Kiev 142, Ukraine
²  Helsinki University of Technology, Laboratory of Physical Metallurgy and Materials Science, P.O. Box 6200, 02015 Hut, Finland
³  Helsinki University of Technology, Laboratory of Biomedical Engineering, P.O. Box 2200, 02015 Hut, Finland

Abstract
Fe-Mn-Si based alloys are known to possess some unique physical and mechanical properties. The main attention has been paid to shape memory effect in these alloys due to their great technological potential. It has been found in previous investigations of present authors that the mechanical and shape memory properties of Fe-Mn-Si based alloys can be improved by additional alloying by interstitial elements. However, the influence of carbon and nitrogen on corrosion resistance of these alloys is quite different. The aim of the present study was to clear up the difference of influence of nitrogen and carbon on the properties of Fe-Mn-Si based alloys with the help of internal friction the most sensitive to interstitial atoms method of investigation. In the present work, several Fe-Mn-Si shape memory alloys with various amounts of nitrogen and carbon are developed. The internal friction measurements have been carried out. The obtained internal friction data were compared with other properties of these alloys. The reasons of different influence of carbon and nitrogen on the properties of shape memory Fe-Mn-Si based alloys were discussed.

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