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Correlation between Activation Volume and Pillar Diameter for Mo and Nb BCC Pillars

Published online by Cambridge University Press:  31 January 2011

Andreas S. Schneider ,
Blythe G. Clark ,
Carl P. Frick  and
Eduard Arzt
Andreas S. Schneider
Affiliation:
aschneider@mf.mpg.de, Max Planck Institute for Metals Research, Stuttgart, Germany
Blythe G. Clark
Affiliation:
blyclar@sandia.gov, Sandia National Laboratories, Albuquerque, New Mexico, United States
Carl P. Frick
Affiliation:
cfrick@uwyo.edu, University of Wyoming, Department of Mechanical Engineering, Laramie, Wyoming, United States
Eduard Arzt
Affiliation:
eduard.arzt@inm-gmbh.de, INM-Leibniz Institute for New Materials and Saarland University, Saarbruecken, Germany
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Abstract

Compression tests with varying loading rates were performed on [001] and [235] oriented small-scale bcc Mo and Nb pillars to determine the contribution of thermally activated screw dislocation motion during deformation. Calculated activation volumes were shown to be in the range of 2 - 9 b3 and by further examination were found to decrease with pillar diameter. This suggests that the kink-pair nucleation of screw dislocations is enhanced by surface effects in the micron and submicron range.

Keywords

Mostress/strain relationshipnanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1185: Symposium II – Probing Mechanics at Nanoscale Dimensions , 2009 , 1185-II07-04
Copyright
Copyright © Materials Research Society 2009

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