Effect of yttrium on martensite-austenite phase transformation temperatures and high temperature oxidation kinetics of Ti-Ni-Hf high-temperature shape memory alloys
| Autor: | Jong Taek Yeom, Kyong Min Kim, Jeoung Han Kim, Sung Young |
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| Rok vydání: | 2016 |
| Předmět: |
musculoskeletal diseases
Austenite Materials science Precipitation (chemistry) 020502 materials Metallurgy Metals and Alloys Oxide chemistry.chemical_element 02 engineering and technology Yttrium Shape-memory alloy 021001 nanoscience & nanotechnology Condensed Matter Physics chemistry.chemical_compound surgical procedures operative Differential scanning calorimetry 0205 materials engineering chemistry Mechanics of Materials Martensite Phase (matter) Materials Chemistry Composite material 0210 nano-technology |
| Zdroj: | Metals and Materials International. 22:204-208 |
| ISSN: | 2005-4149 1598-9623 |
| Popis: | The effect of yttrium (< 5.5 at%) on the martensite-austenite phase transformation temperatures, microstructural evolution, and hot workability of Ti-Ni-Hf high-temperature shape memory alloys is investigated. For these purposes, differential scanning calorimetry, hot compression, and thermo-gravimetric tests are conducted. The phase transformation temperatures are not noticeably influenced by the addition of yttrium up to 4.5 at%. Furthermore, the hot workability is not significantly affected by the yttrium addition up to 1.0 at%. However, when the amount of yttrium addition exceeds 1.0 at%, the hot workability deteriorates significantly. In contrast, remarkable improvement in the high temperature oxidation resistance due to the yttrium addition is demonstrated. The total thickness of the oxide layers is substantially thinner in the Y-added specimen. In particular, the thickness of (Ti,Hf) oxide layer is reduced from ~200 µm to ~120 µm by the addition of 0.3 at% Y. |
| Databáze: | OpenAIRE |
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