Analysis of HRTEM Contrast of Overlapping Structures at Transformation Interfaces
| Autor: | H. P. Karnthaler, T. Waitz |
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| Rok vydání: | 1998 |
| Předmět: |
Materials science
Condensed matter physics business.industry Phase (waves) Moiré pattern Contrast (music) Condensed Matter Physics Projection (linear algebra) Electronic Optical and Magnetic Materials Optics Transformation (function) Transmission electron microscopy Dislocation business High-resolution transmission electron microscopy |
| Zdroj: | physica status solidi (a). 166:107-114 |
| ISSN: | 1521-396X 0031-8965 |
| DOI: | 10.1002/(sici)1521-396x(199803)166:1<107::aid-pssa107>3.0.co;2-6 |
| Popis: | Periodic contrast modulations were observed by high-resolution transmission electron microscopy (HRTEM) methods at the transformation interfaces between different close packed structures in CoFe alloys. Image simulations show that moire fringe patterns caused by overlapping close packed lattices agree with the experimental observations. The moire patterns occur at interfaces that are inclined in the TEM projection. At the phase boundaries periodic arrangements of different trans formation dislocations can lead to self-compensation of the long range strain fields. Since the periodicity of the dislocation arrangement can be equal to the periodicity of the moire fringe pattern a simple interpretation of the contrast modulations in terms of localised periodic strains is not possible. This makes it necessary to analyse the transformation dislocations by Burgers circuits carried out in cross-sectional HRTEM images. |
| Databáze: | OpenAIRE |
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