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Requirements of the nanoscale twin boundaries serving as dislocation sources
Qu Shaoxing *,Wang Guimin,Zhou Haofei,Huang Zhilong
Institute of Applied Mechanics, Zhejiang University
*Correspondence author
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Funding: National Natural Science Foundation of China （No.Nos. 10702062 and 50890174）
Opened online:19 January 2011
Accepted by: none
Citation: Qu Shaoxing,Wang Guimin,Zhou Haofei.Requirements of the nanoscale twin boundaries serving as dislocation sources[OL]. [19 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4406106
 
 
Nanoscale twin boundaries with initial defects are found to be easy dislocation sources in experiments. Here, deformation of nano-twinned single crystals is performed by using atomistic simulations. It is revealed that perfect TBs potentially are not dislocation sources. Another observation is that plastic deformation under uniaxial tensile loading can be dominated by TB migration in samples with inclined TB orientation. Twin planes with disconnections induced by dislocation-TB interactions are obtained during nanoindentation. Under further plastic deformation, it is observed that nucleation of dislocations occur at the disconnections where coherency of TBs has been destroyed.
Keywords:Twin boundaries;Dislocation source;TB migration
 
 
 

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