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Possibility of (111) [sub TB] accommodation mechanism for type-I twin intersection in γ-TiAl during roomtemperature deformation.
- Source :
-
Philosophical Magazine Letters . Feb2001, Vol. 81 Issue 2, p63-70. 8p. 4 Black and White Photographs, 2 Diagrams. - Publication Year :
- 2001
-
Abstract
- Three intersection mechanisms with the gliding planes (111)[sub TB], (001)[sub TB] and (115)[sub TB] respectively have been observed by high-resolution electron microscopy in the type-I twin intersection of gamma-TiAl. It was found that the intersection mechanism that occurred was related to the thickness of the incident twin. The accommodation mechanism on the (111)[sub TB] atomic plane is preferred when the incident twin becomes very thin. The dislocation dissociations of the (111)[sub TB] plane accommodation are the most energetically unfavourable of the dissociations of the three intersection mechanisms; however, the resultant dislocations on the (111)[sub TB] planes are the easiest to propagate away from the intersection area. Accordingly, (111)[sub TB] atomic plane accommodation is considered to be the only mechanism allowing shear transmission under the small local stress of the pile-up of the incident twinning partials. [ABSTRACT FROM AUTHOR]
- Subjects :
- *TITANIUM compounds
*ELECTRON spectroscopy
Subjects
Details
- Language :
- English
- ISSN :
- 09500839
- Volume :
- 81
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Philosophical Magazine Letters
- Publication Type :
- Academic Journal
- Accession number :
- 4197048
- Full Text :
- https://doi.org/10.1080/09500830010014216