著者

本堂 武夫

出版者

北海道大学低温科学研究所

雑誌

低温科学 (ISSN:18807593)

巻号頁・発行日

vol.64, pp.141-156, 2006-03-22

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The plasticity of ice, which demonstrates the strongest anisotropy among the various properties of ice, is reviewed in terms of the characteristic nature of dislocations in ice. Ice is deformed as if all possible sliding systems except for basal sliding are forbidden; like a deck of cards in which the surface is parallel to a basal plane. This peculiar nature of ice plasticity is explained by the characteristic structures of dislocations in ice, or by the fact that it originates with cubic structure Ic embedded in hexagonal ice Ih. The dislocation in ice extends over the basal plane because there is a very small energy difference between Ih and Ic that restricts its movement on the basal plane. Even though only the basal system is active in ice plasticity, it is apparent in the text that non-basal systems are also important in the deformation mechanism.