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Dislocations with edge components in nanocrystalline bcc Mo

Published online by Cambridge University Press:  01 February 2013

G.M. Cheng ,
W.Z. Xu ,
W.W. Jian ,
H. Yuan ,
M.H. Tsai ,
Y.T. Zhu ,
Y.F. Zhang  and
P.C. Millett
G.M. Cheng
Affiliation:
Department of Material Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695
W.Z. Xu
Affiliation:
Department of Material Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695
W.W. Jian
Affiliation:
Department of Material Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695
H. Yuan
Affiliation:
Department of Material Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695
M.H. Tsai
Affiliation:
Department of Material Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695
Y.T. Zhu*
Affiliation:
Department of Material Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695
Y.F. Zhang
Affiliation:
Fuels Modeling and Simulations, Idaho National Lab, Idaho Falls, Idaho 83415
P.C. Millett
Affiliation:
Fuels Modeling and Simulations, Idaho National Lab, Idaho Falls, Idaho 83415
*
a)Address all correspondence to this author. e-mail: ytzhu@ncsu.edu
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Abstract

We report high-resolution transmission electron microscopy (HRTEM) observation of a high density of dislocations with edge components (∼1016 m−2) in nanocrystalline (NC) body-centered cubic (bcc) Mo prepared by high-pressure torsion. We also observed for the first time of the ½<111> and <001> pure edge dislocations in NC Mo. Crystallographic analysis and image simulations reveal that the best way using HRTEM to study dislocations with edge components in bcc systems is to take images along <110> zone axis, from which it is possible to identify ½<111> pure edge dislocations, and edge components of ½<111> and <001> mixed dislocations. The <001> pure edge dislocations can only be identified from <100> zone axis. The high density of dislocations with edge components is believed to play a major role in the reduction of strain rate sensitivity in NC bcc metals and alloys.

Keywords

dislocationbody-centered cubicnanocrystallineHRTEMdeformation mechanisms
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 13: FOCUS ISSUE: Frontiers in Thin-Film Epitaxy and Nanostructured Materials , 14 July 2013 , pp. 1820 - 1826
Copyright
Copyright © Materials Research Society 2013 

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