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Crystallographic orientation relationships and interfaces in laser-processed directionally solidified WC–W2C eutectoid ceramics

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Abstract

Crystallographic orientation relationships and interfaces in directionally solidified WC–W2C eutectoids are investigated by electron microscopy and electron back-scattered diffraction. The WC–W2C eutectoids are prepared by a laser surface processing method, which unidirectionally melts and resolidifies ceramic powder substrates. Lamellar-type microstructures are observed in all samples with preferred nominal growth directions of [\( \overline{1} 2\overline{1} 0 \)]WC//[\( \overline{1} 2\overline{1} 0 \)]W2C along the solidification direction. The majority of interface habit planes are found to be (0001)WC//(0001)W2C. The interfaces are found to be semicoherent, with a misfit Burger’s vector of 1/3[\( 2{\bar{1}} {\bar{1}} 0 \)]. An intermediate layer is identified at the interface and is associated with a change in the stacking sequence of the close-packed (0001) tungsten planes.

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Acknowledgments

This work was supported by the National Science Foundation under Grant #CMMI-1139792. The authors would like to thank Jay F. Tressler at Applied Research Laboratory, Penn State University, PA for the operation of the laser facility and Dev Banerjee of Kennametal, Inc. for useful discussions. We also acknowledge the use of the Analytical Instrumentation Facility at NCSU.

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  1. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA

    Wei-Ting Chen & Elizabeth C. Dickey

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  1. Wei-Ting Chen
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  2. Elizabeth C. Dickey
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Correspondence to Elizabeth C. Dickey.

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Chen, WT., Dickey, E.C. Crystallographic orientation relationships and interfaces in laser-processed directionally solidified WC–W2C eutectoid ceramics. J Mater Sci 51, 4371–4378 (2016). https://doi.org/10.1007/s10853-016-9749-2

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  • DOI: https://doi.org/10.1007/s10853-016-9749-2

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