Abstract
Surface layers containing ZrC dendrites were produced on Zr by the spark machining in kerosene of metallic Zr. Free surfaces and vertical sections were deeply etched to remove the Zr, leaving the ZrC dendrites standing in relief. Scanning electron microscopy revealed that in regions where only a thin carbon enriched melt was produced, ZrC dendrites nucleated at the melt surface and that they propagated laterally on the surface more rapidly than they did into the melt. In regions containing embedded carbide particles which partially dissolved during repeated sparking, dendrites originated preferentially at grain boundary grooves on the surface of the partially dissolved carbide particles.
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Ayers, J.D. Initiation of ZrC dendritic growth on the surface of spark machined zirconium. Metall Trans A 14, 5–10 (1983). https://doi.org/10.1007/BF02643730
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DOI: https://doi.org/10.1007/BF02643730