Three dimensional microstructural characterization of nanoscale precipitates in AA7075-T651 by focused ion beam (FIB) tomography
| Autor: | Arno Merkle, Sudhanshu S. Singh, Nikhilesh Chawla, Jose J. Loza |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Alloy Metallurgy Nucleation Feret diameter 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Focused ion beam Corrosion Mechanics of Materials 0103 physical sciences engineering General Materials Science Grain boundary Stress corrosion cracking 0210 nano-technology |
| Zdroj: | Materials Characterization. 118:102-111 |
| ISSN: | 1044-5803 |
| Popis: | The size and distribution of precipitates in Al 7075 alloys affects both the mechanical and corrosion behavior (including stress corrosion cracking and fatigue corrosion) of the alloy. Three dimensional (3D) quantitative microstructural analysis of Al 7075 in the peak aged condition (T651) allows for a better understanding of these behaviors. In this study, Focused ion beam (FIB) tomography was used to characterize the microstructure in three dimensions. Analysis of grains and precipitates was performed in terms of volume, size, and morphology. It was found that the precipitates at the grain boundaries are larger in size, higher in aspect ratios and maximum Feret diameter compared to the precipitates inside the grains, due to earlier nucleation of the precipitates at the grain boundaries. Our data on the precipitates at the interface between grains and Mg2Si inclusion show that the surfaces of inclusion (impurity) particles can serve as a location for heterogeneous nucleation of precipitates. |
| Databáze: | OpenAIRE |
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