Fine-grained structure formation in LiF single crystals during compression at intermediate temperature

O.S. Sitdikov1,2
1Institute for Metals Superplasticity Problems RAS, Khalturin Str. 39, 450001 Ufa
2Bashkortostan State University, Validy Str. 32, 450076 Ufa
Abstract
The microstructural evolution and a character of dislocation glide have been examined in <100> oriented LiF single crystals at 673K by means of optical microscopy and X-ray analysis. It has been shown that the continuous dynamic recrystallization (CDRX) results in the formation of recrystallized grains. Localization of dislocation glide plays an important role in CDRX providing the formation of separate band-like subgrains after small strain. Longitudinal boundaries of such bands exhibit low migrating ability that prevents collision and following mutual annihilation of subboundaries of opposite signs. As a result, highly stable arrays of low-angle boundaries are formed. Further plastic deformation, leading to continuous increase in misorientation of subboundaries and their eventual conversion into high angle ones, results in the formation of recrystallized grains
Accepted: 27 March 2013
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