Investigation of activities of grain boundaries in nanocrystalline Al under an indenter by a multiscale method

doi:10.1088/1674-1056/21/8/083101

Abstract Activities of grain boundaries in nanocrystalline Al under an indenter are studied by a multiscale method. It is found that grain boundaries and twin boundaries can be transformed into each other by emitting and absorbing dislocations. The transition processes might result in grain coarsening and refinement events. Dislocation reflection generated by a piece of stable grain boundary is also observed, because of the complex local atomic structure within the nanocrystalline Al. This implies that nanocrystalline metals might improve their internal structural stability with the help of some special local grain boundaries.

Keywords: multiscale simulation nanocrystalline materials grain boundaries dislocations

Received: 26 December 2011
Revised: 12 March 2012
Accepted manuscript online:

PACS:	31.15.xv	(Molecular dynamics and other numerical methods)
	61.72.Mm	(Grain and twin boundaries)
	61.82.Rx	(Nanocrystalline materials)
	61.72.Lk	(Linear defects: dislocations, disclinations)

Fund: Project supported by the State Key Development Program for Basic Research of China (Grant No. 2011CB606403).

Corresponding Authors: Shao Yu-Fei, Zhao Xing
E-mail: yfshao@alum.imr.ac.cn; zhao-heng-xing@126.com

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Shao Yu-Fei (邵宇飞), Yang Xin (杨鑫), Zhao Xing (赵星), Wang Shao-Qing (王绍青 ) Investigation of activities of grain boundaries in nanocrystalline Al under an indenter by a multiscale method 2012 Chin. Phys. B 21 083101

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Investigation of activities of grain boundaries in nanocrystalline Al under an indenter by a multiscale method

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