Abstract
Deformation-induced γ ↔ α2 phase transformation in a Ti-47Al-2Cr-2Nb-0.2Y (at.%) alloy compressed at room temperature was investigated by high-resolution transmission electron microscopy (HREM) and energy dispersive spectrum (EDS). The deformation-induced (DI) γ → α2 phase transformation occurred in a twin intersection region. On the other hand, the deformation-induced α2 → γ transformation nucleated at the stacking faults of α2 phase. The composition analysis of the γ and α2 laths by EDS suggested that composition of some laths deviated much from their equilibrium values. These composition deviations promoted the deformation-induced γ ↔ α2 phase transformation to occur; EDS results also suggested that there was no composition difference between the DI-γ plate and the primary γ phase. Based on the HREM and EDS experimental results, the mechanism of the deformation-induced γ ↔ α2 phase transformation has been discussed.
Original language | English |
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Pages (from-to) | 722-726 |
Number of pages | 5 |
Journal | Intermetallics |
Volume | 15 |
Issue number | 5-6 |
DOIs | |
Publication status | Published - 2007 May |
Keywords
- A. Titanium aluminides, based on TiAl
- B. Phase transformations
- D. Microstructure
- F. Electron microscopy, transmission
ASJC Scopus subject areas
- Chemistry(all)
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry