AFM study of the plastic deformation of polysynthetically-twinned (PST) TiAI crystals in soft orientation
✍ Scribed by Yali Chen; David P. Pope
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 540 KB
- Volume
- 69
- Category
- Article
- ISSN
- 1059-910X
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✦ Synopsis
Abstract
PST TiAl samples with a nominal composition of Ti~52~Al~48~ were deformed at room temperature with compression axis inclined to the lamellar interfaces by 45° and one of the side surface normal directions set to be 〈11$\bar{2}$〉. The deformation structures on the free surfaces of the deformed samples were investigated using Atomic Force Microscope (AFM). It was found that in‐plane shear (shear in planes parallel to lamellar interfaces) is the dominant deformation mode in all γ domains and most of the deformation traces on the free surfaces are parallel to lamellar interfaces. Out‐of‐plane shear (shear in planes inclined to lamellar interfaces) also occurs but contributes much less to the macroscopic strain. This selective activation of deformation modes leads to a highly anisotropic deformation behavior in PST crystals with this orientation. Microsc. Res. Tech. 69:366–373, 2006. © 2006 Wiley‐Liss, Inc.