An HREM investigation of a {l_brace}1{bar 2}1{r_brace}{sub L1{sub 0}} boundary in TiAl
Book
·
OSTI ID:78381
- Univ. of Cambridge (United Kingdom). Dept. of Materials Science and Metallurgy
A consideration of {l_brace}1{bar 2}1{r_brace}L1{sub 0} boundaries in their unrelaxed form shows that there are at least three {Sigma}2, six {Sigma}3 and three {Sigma}6 variants possible due to the tetragonal ordering of the L1{sub 0} lattice. Experimental observations of {gamma}-TiAl, obtained by HREM, show that two {gamma}-grains with a true-twin orientation relationship exhibit a rigid body shift between the {l_brace}111{r_brace} planes perpendicular to and either side of a {l_brace}1{bar 2}1{r_brace}{sub L1{sub 0}} interface, and that the interfacial structure is distinct from those previously observed in f.c.c. metals.
- OSTI ID:
- 78381
- Report Number(s):
- CONF-941144--; ISBN 1-55899-265-0
- Country of Publication:
- United States
- Language:
- English
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