Influence of crystallisation conditions on the microtexture of the directionally solidified eutectic of the MgF2-CaF2 system
- 1 November 1990
- journal article
- research article
- Published by Wiley in Crystal Research and Technology
- Vol. 25 (11) , 1287-1298
- https://doi.org/10.1002/crat.2170251112
Abstract
The influence of high‐frequency (HF) and resistive (R) heating of a vertical crystallizer furnace on the directional solidification process of the MgF2CaF2 system eutectic has been compared. The turbulent flow induced by HF heating given rise to inhomogeneities in microtexture, which do not occur under R heating conditions. Variations in the growth rate (v) and temperature gradient (ΔT) lead to characteristic changes of the eutectic microstructure: from lamellar to rod‐like. Quantitative analysis of these changes was advantageously performed using a digital image analysis of the area (AR), maximum cross‐section (D‐MAX), direction of the maximum cross‐section (ANGLE D‐MAX) of MgF2 particles of the microtexture. This was recorded on SCAN images of transverse cuts through the given directionally solified samples as well as the analysis of the shape of MgF2 particles.Keywords
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