Abstract
Crack propagation process in TiAl alloy PST crystal has been investigated by in situ straining TEM observation. It has been found that the influence of lamellar boundaries on the fracture behaviors is connected with the types of interfaces (twin, pseudo-twin and α2/γ interfaces). Even though secondary microcracks always nucleate at α2/γ interfaces due to stress concentration, the crack growth is cleavage in α2 and γ phases rather than along interlamellae. When a crack meet γ/γ interfaces, its propagation can be inhibited and crack tips blunt by the slide of the interfaces. It also deserves to be mentioned that ductility of PST crystals has connection with the rate of crack propagation.
| Original language | English |
|---|---|
| Pages (from-to) | 1047-1052 |
| Number of pages | 6 |
| Journal | Materials Research Society Symposium - Proceedings |
| Volume | 364 |
| Issue number | 2 |
| Publication status | Published - 1995 Jan 1 |
| Event | Proceedings of the 1994 MRS Fall Meeting - Boston, MA, USA Duration: 1994 Nov 28 → 1994 Nov 30 |
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering