High-resolution electron microscopy study of the (1012) twin and defects analysis in deformed polycrystalline alpha titanium

• Published in: Philosophical magazine letters Vol. 74; no. 5; pp. 331 - 338
• Main Author: Braisaz, T.
• Format: Journal Article
• Language: English
• Published: London Taylor & Francis Group 01.11.1996; Taylor & Francis; Taylor and Francis
• Subjects: Applied sciences; Condensed matter: structure, mechanical and thermal properties; Defects and impurities in crystals; microstructure; Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.); Exact sciences and technology; Metals. Metallurgy; Physics; Stacking faults and other planar or extended defects; Structure of solids and liquids; crystallography; Crystal twin; Crystal defects; Deformation; Alpha phase; Transition elements; Polycrystals; Titanium; Experimental study; TEM; High-resolution methods
• ISSN: 0950-0839; 1362-3036
• DOI: 10.1080/095008396180056

A (1012) twin boundary in deformed alpha-Ti has been observed by highresolution electron microscopy. The observations are in agreement with a model calculated using a many-body potential. A twinning dislocation is predicted by the topological theory and characterized directly in the experimental image with the circuit mapping method. It is shown that the core defect is spread along the twin plane as predicted by the atomistic model. Finally, the observation of a large step associated with a dislocation with Burgers vector b10/9 points to the mechanism of matrix dislocation decomposition in the twin boundary.