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Accommodation of large plastic strains and defect accumulation in nanocrystalline Ni grains

Published online by Cambridge University Press:  31 January 2011

X.L. Wu  and
E. Ma
X.L. Wu*
Affiliation:
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
E. Ma*
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218
*
a) e-mail: xlwu@imech.ac.cn
b) e-mail: ema@jhu.edu
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Abstract

A transmission electron microscopy (TEM) study has been carried out to uncover how dislocations and twins accommodate large plastic strains and accumulate in very small nanocrystalline Ni grains during low-temperature deformation. We illustrate dislocation patterns that suggest preferential deformation and nonuniform defect storage inside the nanocrystalline grain. Dislocations are present in individual and dipole configurations. Most dislocations are of the 60° type and pile up on (111) slip planes. Various deformation responses, in the forms of dislocations and twinning, may simultaneously occur inside a nanocrystalline grain. Evidence for twin boundary migration has been obtained. The rearrangement and organization of dislocations, sometimes interacting with the twins, lead to the formation of subgrain boundaries, subdividing the nanograin into mosaic domain structures. The observation of strain (deformation)-induced refinement contrasts with the recently reported stress-assisted grain growth in nanocrystalline metals and has implications for understanding the stability and deformation behavior of these highly nonequilibrium materials.

Keywords

Cold workingMetalNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 8 , August 2007 , pp. 2241 - 2253
Copyright
Copyright © Materials Research Society 2007

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