Shear transmission in lamellar Ti-48at.%Al
Book
·
OSTI ID:571758
- Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering
The transmission of shear across the interfaces between lamellae of {gamma}-TiAl and {alpha}{sub 2}-Ti{sub 3}Al has been studied in the case of a room temperature deformed Ti-48Al alloy containing a significant proportion of the lamellar microstructure. The mechanisms of shear transmission due to dislocation slip has been studied using transmission electron microscopy. Dislocations with Burgers vectors given by b = 1/3<11{bar 2}0> are the only products of slip transmission from the {gamma}-TiAl phase to the {alpha}{sub 2}-Ti{sub 3}Al phase, and essentially no dislocations with b = 1/2<11{bar 2}6>, i.e., c-component dislocations, have been observed. Slip transmission has been associated with impingement of certain cross-lamellar twins, formed by deformation in {gamma}-TiAl, with the {alpha}{sub 2} lamellae. Dislocation based models for the slip transmission processes are proposed.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 571758
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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