The crystallization and growth of AlB2 single crystal flakes in aluminum
| Autor: | Avigdor Zangvil, Jian Ku Shang, Allen Hall, Youren Xu, C. Deppisch, Grace S. Liu, James Economy |
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| Rok vydání: | 1998 |
| Předmět: |
Materials science
Mechanical Engineering Transition temperature Metallurgy chemistry.chemical_element Crystal growth Liquidus Condensed Matter Physics Homogeneous distribution law.invention chemistry Mechanics of Materials law General Materials Science Graphite Crystallization Composite material Boron Single crystal |
| Zdroj: | Journal of Materials Research. 13:3485-3498 |
| ISSN: | 2044-5326 0884-2914 |
| Popis: | An in situ high temperature heat treatment was used to investigate the crystallization and growth behavior of AlB2 flakes in aluminum. Aluminum samples containing 1.8% boron were heated above the liquidus and then rapidly cooled through the Al(L) + AlB12 region to avoid the formation of AlB12 crystals. Subsequently, a homogeneous distribution of high aspect ratio AlB2 flakes crystallized upon holding below the peritectic transition temperature. Growth rate in the (a) and (c) dimensions increased during elevated hold temperatures below the peritectic transition temperature. Surprisingly, faster cooling rates from above the liquidus to room temperature resulted in thinner, wider flakes. Similar to graphite this phenomenon is believed to result from a need to accommodate a changing misfit strain energy between the solidifying aluminum and the growing AlB2 flakes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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