Abstract
The investigation, by light and electron microscopy, as well as by X-ray methods, of the structure of copper and silver samples obtained by containerless solidification in microgravity conditions has revealed a texture of single-crystal type and a clearly pronounced structure. In copper samples, pores have been found whose occurrence could be due to the formation of shrinkage cavities or to the evolution of gases the starting samples contained. The high purity of the materials, lack of contact with container walls and lack of convection have caused the solidification to occur in the conditions of high supercooling with the formation of few dendrites.
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