Quantitative determination of strain fields around Ni{sub 4}Ti{sub 3} precipitates in NiTi
- Electron Microscopy for Materials Science (EMAT) Physics Department, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp (Belgium)
High-resolution transmission electron microscopy and image-processing techniques are used to measure the strain fields surrounding coherent Ni{sub 4}Ti{sub 3} precipitates in an austenitic Ni{sub 51}Ti{sub 49} matrix. Images are recorded in the [111-bar ]{sub B2} and the [101-bar ]{sub B2} zones, and the (110){sub B2} interplanar spacings are used to determine the strain induced by both small (50 nm diameter) and large (300 nm diameter) precipitates. From these observations, the maximum strain in the surrounding matrix is mapped and identified as compressive or tensile. Interactions between strain fields of different precipitates are also investigated. A simple model for the observed strain is proposed and compared to the classical Eshelby solution for an ellipsoidal inclusion.
- OSTI ID:
- 20637152
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 4 Vol. 53; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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