A Study on Uniaxial Tensile Deformation Behavior of Superelastic Titanium Alloy
| Autor: | Heung Nam Han, Hye-Jin Jeong, Sung-Tae Hong, Viet Tien Luu, Yong-Ha Jeong |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Metals and Alloys Uniaxial tension Titanium alloy 02 engineering and technology Deformation (meteorology) 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Modeling and Simulation 0103 physical sciences Composite material 0210 nano-technology Crystal twinning |
| Zdroj: | Korean Journal of Metals and Materials. 58:162-168 |
| ISSN: | 2288-8241 1738-8228 |
| Popis: | A superelastic titanium alloy was subjected to uniaxial tensile deformation at room temperature. The microstructural evolution and deformation mechanisms of the superelastic titanium alloy were investigated by electron backscatter diffraction (EBSD) and X-ray diffraction (XRD). Multiple deformation mechanisms including stress-induced martensitic transformation (SIMT), dislocation slip, {332} and {112} mechanical twinning were identified with the increase in uniaxial strain. In the early stage of deformation, a SIMT from the bcc beta phase to orthorhombic martensite phase dominantly occurred. As the deformation proceeded, the phase fraction of the remained martensite which did not return to beta phase obviously increased due to dislocation slip and mechanical twinning. The kernel average misorientation (KAM) value obtained from EBSD data gradually increased with increasing the deformation, indicating that the dislocation evolution was produced by slip. This was well matched with the trend in the full width at half maximum (FWHM) value of the peak profile obtained from XRD data. In addition, the fraction of the {332} twin was lower than that of the {112} twin in the initial specimen. However, the {332} twin rapidly increased compared to the {112} twin as deformation increased. Therefore, it is confirmed that {332} twinning and dislocation slip were the dominant mechanisms during plastic deformation. |
| Databáze: | OpenAIRE |
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