Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 28, Issue 1, Pages 46-52Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2011.05.015
Keywords
Dislocations; Microstructures; Metallic material; Mechanical testing; Nano-scale plasticity; Nano-scale plasticity
Funding
- Office of Naval Research [N00014-09-1-0883]
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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.
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