The Relationship between Cobalt Amount and Oxidation Parameters in NiTiCo Shape Memory Alloys

Coating shape-memory alloys (SMAs) with a ceramic layer is an important way by which metallurgists change some physical properties and improve biocompatibilities of (SMAs) for some medical purposes. The oxidation behaviors of five NiTiCo samples with different compositions were investigated and thei...

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Bibliographic Details
Published in:	Physics of metals and metallography Vol. 121; no. 14; pp. 1411 - 1417
Main Authors:	Mohammed, S. S., Kök, M., Çirak, Z. D., Qader, I. N., Dağdelen, F., Zardawi, H. S. A.
Format:	Journal Article
Language:	English
Published:	Moscow Pleiades Publishing 01-12-2020 Springer Springer Nature B.V
Subjects:	Ceramic coatings Chemistry and Materials Science Degassing of metals Differential thermal analysis Diffusion Enthalpy Gravimetric analysis Martensitic transformations Materials Science Metallic Materials Metals Oxidation Oxidation-reduction reaction Phase Transformations Phase transitions Physical properties Shape memory alloys Structure Surgical implants Thermal transformations Titanium compounds Transformation temperature shape memory alloy oxidation NiTi-based shape memory alloy cobalt
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Summary:	Coating shape-memory alloys (SMAs) with a ceramic layer is an important way by which metallurgists change some physical properties and improve biocompatibilities of (SMAs) for some medical purposes. The oxidation behaviors of five NiTiCo samples with different compositions were investigated and their influence on the thermal characteristics of phase transformation temperatures was studied. The kinetic oxidation as a function of time was determined by using the results of measurements via a combined method of the thermal gravimetrical (TG) and differential thermal (DT) analysis (TG/DTA), at 1323 K for one hour. The SEM-EDX results showed that an oxidation layer covered the surface of the alloys with ceramic compounds consisting of titanium and oxygen. The phase transformation temperatures were increased with respect to non-oxidized NiTiCo alloys. Likewise, the enthalpy change during the heating process was affected by the oxidation process.
ISSN:	0031-918X 1555-6190
DOI:	10.1134/S0031918X2013013X