Formation of nanocrystals in an amorphous Al 90 Y 10 alloy
| Autor: | E. Pershina, D. V. Matveev, G. E. Abrosimova, A. Aronin |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Amorphous metal Mechanical Engineering Alloy Crystal growth 02 engineering and technology Activation energy engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nanocrystalline material law.invention Amorphous solid Crystallography Differential scanning calorimetry Mechanics of Materials law 0103 physical sciences engineering General Materials Science Crystallization Composite material 0210 nano-technology |
| Zdroj: | Materials Characterization. 133:87-93 |
| ISSN: | 1044-5803 |
| Popis: | Crystallization process of Al 90 Y 10 amorphous alloy after heat treatment is investigated. Analysis of the structural transformations after heat treatment makes it possible to estimate the activation energy of crystallization and the diffusion coefficient in the deformed amorphous phase. Kissinger and Augis-Bennett models are employed to obtain the activation energy of the as-quenched alloy based on the differential scanning calorimetry (DSC) data. The crystallization of Al 90 Y 10 amorphous alloy at high pressure torsion (HPT) is studied and the kinetic characteristics of crystal growth in a deformed matrix are determined. It is established that the nanocrystalline Al phase precipitates in the alloy subjected to HPT. The size of Al nanocrystals is measured to be about 9 nm and does not depend on deformation degree. It is suggested that the nanocrystallization of amorphous alloy during deformation is due to the simultaneous effect of structural changes in the amorphous matrix and of a local increase of the temperature during HPT processing. The local temperature increase at the crystallization front is estimated to be about 120 K. |
| Databáze: | OpenAIRE |
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