Mechanisms of tensile strengthening and oxygen solid solution in single β-phase Ti-35 at.%Ta+O alloys
| Autor: | Katsuyoshi Kondoh, Katsuya Yokota, Kazuki Shitara, Abdollah Bahador, Junko Umeda |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Diffraction Materials science Mechanical Engineering Alloy Analytical chemistry Titanium alloy chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Oxygen Grain size Lattice constant chemistry Mechanics of Materials 0103 physical sciences Ultimate tensile strength engineering General Materials Science 0210 nano-technology Solid solution |
| Zdroj: | Materials Science and Engineering: A. 802:140677 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2020.140677 |
| Popis: | Single β phase titanium alloys are used for fabricating biomedical devices, and it is desirable to improve the strength of these alloys. In this study, the tensile strength of Ti-35 at.% Ta alloys with a single β phase was improved using oxygen solid solution and the strengthening mechanism was also investigated. The lattice constants of these alloys calculated from X-ray diffraction data increased with an increase in the oxygen content. This result suggests that oxygen atoms formed solutes in the alloys, which was supported by results obtained from first-principles calculations. Microstructural analyses of the alloys indicate that Ti, Ta, and O were homogeneously distributed. Tensile tests were conducted for the alloys, and the 0.2%YS increased with the increase in the O content of the alloy. The increments of 0.2%YS which was determined experimentally correspond well with the theoretically determined trend, and this observation is a result of the effect of the change in grain size and O solid solution. The contribution of the grain refinement was negligibly small compared with that of the O solid solution, and the latter is the major reason for the observed increase in the 0.2%YS of the Ti-35 at.% Ta alloys. |
| Databáze: | OpenAIRE |
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