Specifically designed concentration profiles created by sudden velocity changes during directional solidification
| Autor: | D. Mey, Dongmei Liu, Hannes Engelhardt, S. Kiefer, Markus Rettenmayr, Stephanie Lippmann |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Diffusion Alloy 02 engineering and technology Mechanics engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Inorganic Chemistry 0103 physical sciences Materials Chemistry engineering Melt convection 0210 nano-technology Concentration gradient Directional solidification |
| Zdroj: | Journal of Crystal Growth. 506:97-101 |
| ISSN: | 0022-0248 |
| DOI: | 10.1016/j.jcrysgro.2018.10.020 |
| Popis: | We investigate how macrosegregation formation during directional solidification can be purposefully influenced to form sequences of concentration gradients along rod shaped samples. The effects of sudden changes of the solidification velocity on solute segregation are systematically characterized for conditions with reduced and enhanced melt convection, respectively. We present a solidification routine that is capable of creating alloy samples with specifically designed concentration profiles that are comprised of areas with low solute concentration and peaks of steeply increasing and decreasing solute concentration. The peaks can be adjusted with respect to the concentration interval, width and individual position along the sample. These multiple graded materials are useful for the characterization of (multicomponent) diffusion processes. |
| Databáze: | OpenAIRE |
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