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The influence of secondary phase carbide particles on the passivity behaviour of NiTi shape memory alloys / L. Neelakantan in Materials and corrosion, Vol. 63 N° 11 (Novembre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 979–984 Titre : The influence of secondary phase carbide particles on the passivity behaviour of NiTi shape memory alloys Type de document : texte imprimé Auteurs : L. Neelakantan, Auteur ; B. Monchev, Auteur ; M. Frotscher, Auteur Année de publication : 2014 Article en page(s) : pp. 979–984 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Inclusions;  interfaces;  nickel  titanium  shape  memory  alloys;  pitting;  polarisation Résumé : The current investigation aims at studying the passivity behaviour of NiTi shape memory alloys with different levels of secondary phase titanium carbide (TiC) particles in an electrolyte of 0.9% sodium chloride at 37 °C. The influence of carbides and thermo-mechanical treatment/cold working on the passivity breakdown is highlighted. The polarisation studies on the as-cast and cold worked NiTi with high (0.05 wt%) and low (0.005 wt%) carbon levels show a significant difference in oxide stability. The alloy with extremely low carbon content shows a higher breakdown potential. Higher carbon levels result in higher density of larger TiC and these carbide/matrix interfaces are more susceptible to pitting. The qualitative behaviour of passive layer formed at 0.5 V on the cold worked NiTi alloy with different carbon levels was ascertained by electrochemical impedance spectroscopy (EIS). The oxide on the NiTi alloy with high (0.05 wt%) carbon levels showed lower resistance and poor stability at this condition. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106402/abstract [article] The influence of secondary phase carbide particles on the passivity behaviour of NiTi shape memory alloys [texte imprimé] / L. Neelakantan, Auteur ; B. Monchev, Auteur ; M. Frotscher, Auteur . - 2014 . - pp. 979–984. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 979–984 Mots-clés : Inclusions;  interfaces;  nickel  titanium  shape  memory  alloys;  pitting;  polarisation Résumé : The current investigation aims at studying the passivity behaviour of NiTi shape memory alloys with different levels of secondary phase titanium carbide (TiC) particles in an electrolyte of 0.9% sodium chloride at 37 °C. The influence of carbides and thermo-mechanical treatment/cold working on the passivity breakdown is highlighted. The polarisation studies on the as-cast and cold worked NiTi with high (0.05 wt%) and low (0.005 wt%) carbon levels show a significant difference in oxide stability. The alloy with extremely low carbon content shows a higher breakdown potential. Higher carbon levels result in higher density of larger TiC and these carbide/matrix interfaces are more susceptible to pitting. The qualitative behaviour of passive layer formed at 0.5 V on the cold worked NiTi alloy with different carbon levels was ascertained by electrochemical impedance spectroscopy (EIS). The oxide on the NiTi alloy with high (0.05 wt%) carbon levels showed lower resistance and poor stability at this condition. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106402/abstract