Deformation of polysynthetically twinned (PST) TiAl crystals at high strain rate and high temperature
- Los Alamos National Lab., NM (United States). Materials Science and Technology Div.
- Kyoto Univ. (Japan). Dept. of Metal Science and Technology
Deformation microstructures in a 435{degree} <{bar 3}21> oriented polysynthetically twinned (PST) TiAl crystal deformed in compression at 3000 s{sup {minus}1} and 800 C was studied. Deformation of this PST crystal is characterized as follows: (1) Deformation of domains [III] and [IV] is dominated by 1/6[11{bar 2}](111) parallel twinning (twinning parallel to lamellar interfaces). Ordinary dislocations observed in these domains are found to be a complementary deformation mode. (2) Deformation of domains [II], [V] and [VI] is controlled by ordinary dislocation slip. Complementary deformation modes in these domains are ordinary dislocation slip, superdislocation slip and cross-twinning. (3) Domain [I] is not deformed after the specimen deforms up to {approximately}7% strain.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 571744
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Measurement of twinning elements in PST TiAl single crystals
Plastic deformation of V- and Zr-alloyed PST TiAl in tension and compression at room temperature