Abstract
Micromechanics theory is used to analyze the yield stress of polysynthetically twinning (PST) crystals of γ-TiAl as a function of the loading angle θ between the lamellar and the loading axis. The numerical results of yield strength, based on considering the lamellar microstructure and the deformation mechanisms such as ordinary slip systems and true twinnings in PST crystals composed of γ and α2 phase, is obtained by using calculating of resolved shear stresses in all slip systems based on micromechanical method. The emphasis was put on discussing the influence of prism slip systems in α2 phase on the yield stress of polysynthetically twinning (PST) crystals of γ-TiAl. The results indicates that the slip systems in α2 phase have, to a certain extent, influences on the yield strength of PST crystals, especially at small angles θ directions.
| Original language | English |
|---|---|
| Pages (from-to) | 808-810 |
| Number of pages | 3 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 33 |
| Issue number | 8 |
| Publication status | Published - Aug 2004 |
Keywords
- Micromechanics
- PST crystals
- Slip systems
- Yield stress