Elliptic nanopores in deformed nanocrystalline and nanocomposite materials |
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| Authors: | I A Ovid’ko A G Sheinerman |
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| Institution: | 1. Institute of Problems of Mechanical Engineering, Russian Academy of Sciences , Bolshoj 61, Vasil. Ostrov, St. Petersburg 199178, Russia ovidko@def.ipme.ru;3. Institute of Problems of Mechanical Engineering, Russian Academy of Sciences , Bolshoj 61, Vasil. Ostrov, St. Petersburg 199178, Russia |
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| Abstract: | A theoretical model is suggested which describes the nucleation of nanoscale pores (nanopores) of elliptic shape in deformed nanocrystalline and nanocomposite materials. In the framework of the model, elliptic nanopores in nanocrystalline and nanocomposite materials nucleate at interfaces in the stress fields of interfacial edge dislocations with large Burgers vectors. When elliptic nanopores nucleate, they remove the cores of interfacial dislocations. The stress field and energy of such dislocated elliptic nanopores are calculated, and their equilibrium sizes and shape parameters are revealed. It is theoretically shown that the elliptic shape of nanopores is due to the effects of interfaces (grain and interphase boundaries) on fracture processes at the nanoscale level. |
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