Abstract
In this work, an in-situ observation of β to α phase transformation in Ti-45Al-8.5Nb-(W, B, Y) (at. %) alloy was conducted using high-temperature laser-scanning confocal microscopy (HTLSCM). The results show that the nucleation of α grain occurs at β grain boundaries or on borides. The morphology of the α phase is strongly dependent on the cooling rate. On fast cooling, α phase presents a lath-like Widmannstätten morphology, whereas the equiaxed ones form at slow cooling. Electron backscatter diffraction (EBSD) results show that the volume fraction of Burgers α phase decreases with cooling rate reducing. These phenomena can be attributed to the competitive growth mechanism between the textured and non-Burgers α phase during β to α transformation.
Original language | English |
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Pages (from-to) | 594-600 |
Number of pages | 7 |
Journal | Journal of Alloys and Compounds |
Volume | 663 |
DOIs | |
State | Published - 5 Apr 2016 |
Keywords
- Intermetallics
- Microstructure
- Phase transformation
- Scanning electron microscopy, SEM