Thermodynamic stabilization of nanocrystalline aluminum
| Autor: | Pankaj Kumar, Mano Misra, Pradeep Menezes, Leslie T. Mushongera, Jacob Hohl |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Dopant 020502 materials Mechanical Engineering 02 engineering and technology Microstructure Grain size Nanocrystalline material Grain growth 0205 materials engineering Chemical engineering Mechanics of Materials Volume fraction General Materials Science Grain boundary Chemical stability |
| Zdroj: | Journal of Materials Science. 56:14611-14623 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-021-06224-2 |
| Popis: | Nanocrystalline metals are generally unstable due to a large volume fraction of high-energy grain boundaries associated with a small grain size. Preferential dopant segregation to the high-energy grain boundaries is observed to enhance the stability of the material’s microstructure by minimizing its energy. Nanocrystalline aluminum-dopant systems were evaluated for thermodynamic stability against grain growth and phase precipitation via the mechanism of grain boundary segregation according to a modified regular nanocrystalline solution model. Fifty-one potential dopant elements have been evaluated for their efficacy in stabilizing nanostructures with three potential candidates, magnesium, lanthanum, and silicon, identified possessing the characteristics to promote grain boundary segregation and a state of thermodynamic stability in aluminum’s nanocrystalline regime. The minimum dopant content required to achieve nanocrystalline microstructure stability is identified for each of the three candidate elements. Beyond this minimum content, further addition of the dopant elements decreased the final microstructure’s stability with no effects on the existence of a stable nanocrystalline state. |
| Databáze: | OpenAIRE |
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