  We have grown a single crystal of the equiatomic FeCoCrMnAl high-entropy
alloy. The crystal was grown by means of the Bridgman technique and is about 1
cm in diameter and 6.6 cm in length. X-ray Laue images taken at various
positions on the surface are sharp and mutually consistent, reflecting its
single-crystal nature. We thus report on the first successful growth of a
single crystal of a high-entropy alloy with a volume of the order of cubic
centimeters. The material has a microstructure consisting of B2 inclusions in a
body-centered cubic matrix on the 10 nm length scale.
