The Relationship between Cobalt Amount and Oxidation Parameters in NiTiCo Shape Memory Alloys
| Autor: | Ibrahim Nazem Qader, Zehra Deniz Cirak, H. S. A. Zardawi, Safar Saeed Mohammed, Mediha Kök, Fethi Dagdelen |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Enthalpy chemistry.chemical_element Shape-memory alloy engineering.material Condensed Matter Physics 01 natural sciences Oxygen chemistry Chemical engineering Coating Phase (matter) visual_art 0103 physical sciences Materials Chemistry engineering visual_art.visual_art_medium Ceramic 010306 general physics Cobalt Titanium |
| Zdroj: | Physics of Metals and Metallography. 121:1411-1417 |
| ISSN: | 1555-6190 0031-918X |
| DOI: | 10.1134/s0031918x2013013x |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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