A nucleation mechanism of deformation twins in pure aluminum
作者： B. Li , B.Y. Cao , K.T. Ramesh , E. Ma
DOI: 10.1016/J.ACTAMAT.2009.06.014
关键词:
摘要: Abstract Due to the high stacking fault energy (SFE) of pure aluminum (Al) and prediction that trailing partial dislocations are energetically favored over twinning partials, it is believed normally does not happen in Al, except at crack tips. Using molecular dynamics simulations, we demonstrate deformation single crystal Al where a shear strain applied parallel (1 1 1) along [ 1 2 ¯ ] . Based on propose dislocation reaction model generates two-layer twin embryo as one mechanism for nucleation after emission partials. We also analyze conditions favorable terms effective SFE. These analyses shed light observations twins nucleated especially those nanocrystalline grains. present experimental high-strain-rate room temperature.
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