期刊
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
卷 5, 期 5, 页码 435-443出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1359-0286(01)00024-9
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Recent molecular-dynamics simulations of the high-temperature structure of high-energy grain boundaries in silicon and in f.c.c. metals have revealed a universal, highly confined, liquid-like structure. As a consequence, at elevated temperatures grain-boundary properties, such as the diffusivity and mobility, involve liquid-like mechanisms and are independent of the boundary misorientation, with activation energies related to the liquid state. At lower temperatures these boundaries undergo a reversible structural and dynamical transition from a confined liquid to a-more or less disordered solid. Consistent with experiments, the temperature for this transition decreases with increasing grain-boundary energy, suggesting an important role of the degree of short-range grain-boundary structural disorder in key GB properties. (C) 2001 Elsevier Science Ltd. All rights reserved.
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