Directional solidification of Fe-Al-Ta eutectic by electron beam floating zone melting

Fe-Al-Ta eutectic composites have been paid more attentions for high temperature application. Nevertheless, still there is a lack of research on microstructural characteristics and crystal growth mechanism of this eutectic obtained by high temperature gradient directional solidification technique. A...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-05, Vol.785, p.62-71
Main Authors: Cui, Chunjuan, Ren, Chiqiang, Liu, Yanyun, Wang, Songyuan, Su, Haijun
Format: Article
Language:English
Subjects:
Crystal growth
Directional solidification
Electron beam float zone melting
Electron beams
Eutectic composites
Eutectic temperature
High temperature
Interface stability
Iron
Lattice misfit
Microstructure
Morphology
Preferential orientation
Silicon
Solid/liquid interface
Temperature gradients
Zone melting
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Summary:Fe-Al-Ta eutectic composites have been paid more attentions for high temperature application. Nevertheless, still there is a lack of research on microstructural characteristics and crystal growth mechanism of this eutectic obtained by high temperature gradient directional solidification technique. As such, Fe-Al-Ta eutectic composites were prepared by high temperature gradient electron beam floating zone melting technique in the present paper. Microstructures, solid/liquid interface morphologies and preferential orientations of the Fe-Al-Ta eutectic composites at different solidification rates were studied. Moreover, effect of interface perturbation wavelength on stability of the solid/liquid interface was calculated according to M-S theory and Kurz-Fisher model, respectively. These are consistent with the experimental results well. •Eutectic colonies are formed in Fe-Al-Ta eutectic composites.•Lamella/rod transition is caused by growth direction deviation from one to another.•Cellular solid/liquid interfaces are formed due to disturbance.•Preferential orientations at different solidification rates are not exactly same.•Phase interface is a semi-coherent interface with low interface energy.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.01.158