Abstract
Microstructural refinement by two steps heat treatment in Ti-47Al-2Cr-2Nb at.% alloy, with samples' dimension of Dia 15 mm × 80 mm, is studied in this paper. A coarse fully lamellar microstructure can be refined to a near gamma (NG) one with a grain size of ∼180 μm by one step heat treatment of 115°C for 12 h. The instability of initial structure plays an important role in the transformation. Some samples are subsequently treated at 128°C for 2 h, the NG structure is further converted to a new lamellar structure through α laths precipitated with different directions within each γ; grain and room temperature tensile elongation of the alloy is reached to a value of 1.28% after two steps heat treatments.
| Original language | English |
|---|---|
| Pages (from-to) | 281-287 |
| Number of pages | 7 |
| Journal | High Temperature Materials and Processes |
| Volume | 31 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jun 2012 |
Keywords
- Heat treatment
- Mechanical properties
- γ Segregation
- γ-TiAl based alloys
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