Deformation Twinning in Nanocrystalline Ni during Cryogenic Rolling

Chin. Phys. Lett.

2006, Vol. 23

Issue (2): 420-422 DOI:

Original Articles

Deformation Twinning in Nanocrystalline Ni during Cryogenic Rolling

FENG Xiu-Yan¹;CHENG Zhi-Ying²;ZHOU Jia¹;WU Xiao-Lei¹;WANG Zi-Qiang¹;HONG You-Shi¹

¹State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 ²Department of Materials Science Engineering, Tsinghua University, Beijing 100084

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FENG Xiu-Yan, CHENG Zhi-Ying, ZHOU Jia et al 2006 Chin. Phys. Lett. 23 420-422

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Abstract Deformation twinning is evidenced by transmission electron microscopy examinations in electrodeposited nanocrystalline (nc) Ni with mean grain size 25nm upon cryogenic rolling. Two twinning mechanisms are confirmed to operate in nc grains, i.e. heterogeneous formation via emission of partial dislocations from the grain boundary and homogeneous nucleation through dynamic overlapping of stacking faults, with the former being determined as the most proficient. Deformation twinning in nc Ni may be well interpreted in terms of molecular dynamics simulation based on generalized planar fault energy curves.

Keywords: 61.72.Mm 61.72.Nn 62.20.Fe 81.07.Bc

Published: 01 February 2006

PACS:	61.72.Mm	(Grain and twin boundaries)
	61.72.Nn	(Stacking faults and other planar or extended defects)
	62.20.Fe
	81.07.Bc	(Nanocrystalline materials)

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	HONG You-Shi

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