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Acta Metall Sin  2014, Vol. 50 Issue (2): 129-136    DOI: 10.3724/SP.J.1037.2013.00697
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PLASTIC DEFORMATION MECHANISMS IN NANOTWINNED METALS
LU Lei, YOU Zesheng
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
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Abstract  A brief overview is provided about the plastic deformation mechanisms in nanotwinned metals. The unique two-dementional nanoscale twin lamellae lead to different dislocation slip systems activated during plastic deformation. It has been revealed that there are three distinctly different dislocation-mediated deformation mechanisms in nanotwinned metals, namely dislocation pile-up against and slip transfer across twin boundaries, Shockley partials gliding on twin boundaries leading to twin boundary migration, and threading dislocations slip confined by neighboring twin boundaries. It is further demonstrated that these three dislocation-mediated mechanisms are switchable upon changing in the loading direction with respect to twin boundaries.
Key words:  nano-twinned metal      deformation mechanism      dislocation slip      anisotropy      mechanical property     
ZTFLH:  TG146  
Fund: Supported by National Basic Research Program of China (No.2012CB932202) and National Natural Science Foundation of China (Nos.51071153 and 51371171)
Corresponding Authors:  LU Lei, professor, Tel: (024)23971939, E-mail: llu@imr.ac.cn   

Cite this article: 

LU Lei,YOU Zesheng. PLASTIC DEFORMATION MECHANISMS IN NANOTWINNED METALS. Acta Metall Sin, 2014, 50(2): 129-136.

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00697     OR     https://www.ams.org.cn/EN/Y2014/V50/I2/129

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