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Directional solidification of LaB6-ZrB2, by use of an electron beam heating technique, yielded oriented ZrB2fibers in a LaB6matrix. The average diameter of the ZrB2fibers was ?0.2-1.2 µm, with fiber lengths up to 100 µm. Primary platelike LaB6dendrites formed upon the solidification of an ingot with a composition of LaB6-18 wt ZrB2. LaB6was the first phase to nucleate when eutectic growth occurred, and ZrB2showed nonfaceted growth. For the ingot solidified with planar growth the orientation relations of the phases were as follows: growth direction, 001LaB600.1ZrB2; interfacial plane, 11.0LaB6(11.0)ZrB2.