Solidification Morphology and Microstructure of the Si Particles with Fe, Nd and Gd Additions Formed using a Short-Drop Tube Process

DOI:10.15011/ijmsa.33.330217
Int. J. Microgravity Sci. Appl. 2016p330217
Author
Tadaharu KAWAMURA and Katsuhisa NAGAYAMA
Organization
Department of Materials Science, Faculty of Engineering, Shibaura Institute of Technology
Abstract
Using a drop tube process, single crystal formation of Si particles has been reported by K. Kuribayashi et al. However, the solidification morphology and microstructure of Si with Fe, Nd, and Gd additions has yet to be explained. In this study, we have prepared Si particles with Fe, Nd, and Gd additions using a short-drop tube apparatus with a freefall length of 2.5 m. In addition, we have investigated the effect of the additional elements upon the solidification morphology and microstructure of Si. The binary Si particles with Fe additions formed α-FeSi2. The binary Si particles with Nd or Gd additions formed eutectic structures comprising Si and NdSi1.8 or Si and GdSi2 silicide compound. The ternary Si particles with added Fe and Nd or Gd formed eutectic structures comprising α-FeSi2 and NdSi1.8 or α-FeSi2 and GdSi2 silicide compounds.
Keyword(s)
Drop tube, Si particle, Crystal growth, Silicide, Eutectic structure
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Received 22 December 2015, accepted 10 April 2016, published 30 April 2016

© The Japan Society of Microgravity Applicaiton

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