Mechanism of competitive grain growth in a curvilinear channel of crystal-sorter during the orientational solidification of nickel-based heat-resistant alloy
| Autor: | A. N. Pozdnyakov, M. Yu. Ershov, A. V. Monastyrskiy, V. P. Monastyrskiy |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Curvilinear coordinates Materials science Condensed matter physics 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Azimuth Crystal Crystallography Temperature gradient Grain growth Orientation (geometry) visual_art 0103 physical sciences Materials Chemistry visual_art.visual_art_medium Ceramic 0210 nano-technology Directional solidification |
| Zdroj: | Physics of Metals and Metallography. 118:652-658 |
| ISSN: | 1555-6190 0031-918X |
| DOI: | 10.1134/s0031918x17070067 |
| Popis: | Using numerical simulation in the ProCAST program complex, the conditions of the solidification of heat-resistant nickel alloy in curvilinear channels of a ceramic mold have been investigated. It has been shown that, in practically important cases, the vector of the temperature gradient is oriented along the axis of the curvilinear channel. In a spiral crystal selector, a cyclic change in the preferred direction of growth occurs because of the cyclic change in the direction of the vector of the temperature gradient. The fact that the vector of the temperature gradient is almost always directed along the axis of the curvilinear channel makes it possible to govern the orientation of the vector of the temperature gradient in space and, therefore, to obtain a grain with the preferred crystallographic orientation. Based on the results of this investigation, a method of the grain selection with a desired azimuthal orientation is proposed. |
| Databáze: | OpenAIRE |
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