Using the floating-zone method, Ni and Co single crystals were grown under various experimental conditions. Detailed observations of low angle boundaries or striations and of the dislocation arrangements in the grown crystals were carried out using an optical microscope. Ni single crystals grew preferentially along the direction and were striation-free. As the growth direction deviated from the , sharp striations were formed. The dislocation density in the crystals was about 10^6 cm^, which were distributed at random. Co single crystals grew along the direction and were also striation-free. As the growth direction deviated from the , many striations were formed with more complex shapes. These experimental results are discussed on the basis of the growth mechanism of crystals and of dislocation behaviour during the solidification process
