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Grain refinement at the nanoscale via mechanical twinning and dislocation interaction in a nickel-based alloy

Published online by Cambridge University Press:  03 March 2011

N.R. Tao ,
X.L. Wu ,
M.L. Sui ,
J. Lu  and
K. Lu
N.R. Tao
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
X.L. Wu
Affiliation:
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanism, Chinese Academy of Sciences, Beijing 100080, China
M.L. Sui
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
J. Lu*
Affiliation:
LASMIS, University of Technology of Troyes, 10000 Troyes, France
K. Lu
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
a) Address all correspondence to this author. e-mail: lu@imr.ac.cn
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Abstract

A nanostructured surface layer was formed on an Inconel 600 plate by subjecting it to surface mechanical attrition treatment at room temperature. Transmission electron microscopy and high-resolution transmission electron microscopy of the treated surface layer were carried out to reveal the underlying grain refinement mechanism. Experimental observations showed that the strain-induced nanocrystallization in the current sample occurred via formation of mechanical microtwins and subsequent interaction of the microtwins with dislocations in the surface layer. The development of high-density dislocation arrays inside the twin-matrix lamellae provides precursors for grain boundaries that subdivide the nanometer-thick lamellae into equiaxed, nanometer-sized grains with random orientations.

Keywords

Grain refinementNanostructured materialsMechanical microtwin
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 6 , June 2004 , pp. 1623 - 1629
Copyright
Copyright © Materials Research Society 2004

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