Crystallographic orientation and size dependence of tension-compression asymmetry in molybdenum nano-pillars

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Uniaxial tension and compression experiments on [0 0 1] and [0 1 1] oriented molybdenum nano-pillars exhibit tension-compression asymmetry, a difference in attained stresses in compression vs. tension, which is found to depend on crystallographic orientation and sample size. We find that (1) flow stresses become higher at smaller diameters in both orientations and both loading directions, (2) compressive flow stresses are higher than tensile ones in [0 0 1] orientation, and visa versa in [0 1 1] orientation, and (3) this tension-compression asymmetry is in itself size dependent. We attribute these phenomena to the dependence of twinning vs. antitwinning deformation on loading direction, to the non-planarity of screw dislocation cores in Mo crystals, and to the possibly lesser role of screw dislocations in governing nano-scale plasticity compared with bulk Mo. (C) 2011 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2012-01
Language
English
Article Type
Article
Keywords

SINGLE-CRYSTALS; PLASTIC-DEFORMATION; SCREW DISLOCATIONS; FLOW-STRESS; TUNGSTEN; NANOSCALE; STRENGTH; SCALE; GLIDE

Citation

INTERNATIONAL JOURNAL OF PLASTICITY, v.28, no.1, pp.46 - 52

ISSN
0749-6419
DOI
10.1016/j.ijplas.2011.05.015
URI
http://hdl.handle.net/10203/255370
Appears in Collection
NE-Journal Papers(저널논문)
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