Abstract
Interphase precipitation is a phenomenon observed in some steels, such as carbon-copper-nickel steels and vanadium alloyed carbon steels. It was observed that γ-based titanium aluminides, when exposed to elevated temperature, also showed interphase precipitation. An alloy of Ti 47Al-0.5 at.%W-40 wppm B was aged for 1 week in the temperature range 800-1200°C followed by furnace cooling. The transmission electron microscopy analysis of the alloy showed the growth of γ grains into the lamellar structure, which consisted of alternate plates of the γ and α2 phases. Interphase precipitation was found to occur at the γ/lamellar colony interface. These precipitates had an equiaxed faceted morphology with an aspect ratio of approximately 2:1. The precipitates belonged to either the α2 phase or the Ti 2Al(C, N) phase. The Shoji-Nishiyama orientation relationship has also been established between the advancing γ grain and both the α2 as well as Ti2Al(C, N) precipitates.
| Original language | English |
|---|---|
| Pages (from-to) | 21-25 |
| Number of pages | 5 |
| Journal | Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing |
| Volume | 269 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 1999 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Keywords
- Alloys
- Interphase precipitation
- Titanium aluminides