In this study, severe plastic deformation through high-pressure sliding (HPS) was applied for in situ high-energy X-ray diffraction analysis at SPring-8 in JASRI (Japan Synchrotron Radiation Research Institute). Allotropic transformation of pure Ti was examined in terms of temperatures, pressures and imposed strain using a miniaturized HPS facility. The true pressure applied on the sample was estimated from the peak shift. Peak broadening due to local variation of pressure was reduced using white X-rays. The phase transformation from ¡ phase to ½ phase occurred at a pressure of 34.5 GPa. Straining by the HPS processing was effective to promote the transformation to the ½ phase and to maintain the ½ phase even at ambient pressure. The reverse transformation from ½ phase to ¡ phase occurred at a temperature of 3110°C under ambient pressure, while under higher pressure as 34 GPa, the ½ phase remained stable even at 3170°C covered in this study. It was suggested that the reverse transformation from the ½ phase to the ¡ phase is controlled by thermal energy.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering