Guy Molénat, Jean-Philippe Monchoux, Bénédicte Warot-Fonrose, Alain Couret
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Abstract
Transmission electron microscopy is used to study the structure and morphology of nanoprecipitates of ω-type phase located in the βo-phase of a TNM-TiAl alloy. Using conventional and high-resolution imaging techniques, it is demonstrated that this ω- precipitation takes the form of needle-shaped nanoprecipitates that have characteristic dimensions of a few nanometers. Analyses of electronic diffraction patterns show that these precipitates are of a metastable ω” phase.
Then, it is investigated how these nanoprecipitates affect the dislocation glide mechanism at room temperature in this βo-phase. For this purpose, quantitative measurements of densities of precipitates and of dislocation pinning points are developed. A comparison of these data indicates that only the largest precipitates serve as dislocations' pinning points.
期刊介绍：
Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials.
The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal.
The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include:
Metals & Alloys
Ceramics
Nanomaterials
Biomedical materials
Optical materials
Composites
Natural Materials.
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