Journal
ACTA MATERIALIA
Volume 96, Issue -, Pages 249-257Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.06.020
Keywords
Zirconium; Micro-cantilever test; Slip properties; Anisotropy; CRSS
Funding
- Engineering and Physical Sciences Research Council [EP/K039237/1, EP/H018921/1, EP/K034332/1]
- EPSRC [EP/K034332/1, EP/K039237/1, EP/K039237/2, EP/H018921/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K034332/1, EP/H018921/1, EP/K039237/1, EP/K039237/2, EP/K503733/1] Funding Source: researchfish
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Slip strengths of < a > basal, < a > prism, and < c+a > pyramidal systems in commercially pure zirconium have been determined using micro-cantilever testing. A range of single crystal cantilevers 0.5 mu m to 10 um wide, oriented for single slip were prepared using focused ion beam (FIB) machining and subsequently deflected using a nanoindenter. The critical resolved shear stress (tau(crss)) was found by fitting a crystal plasticity finite element model to the experimental load-displacement data for these micro-bending tests. All the three slip systems in alpha-Zr show a marked size effect in bending described well by tau(CRSS)(W) = tau(0) + AW(n), where W is the cantilever width, tau(0) is the CRSS at the macro scale and n = similar to-1. The exponent, n, of near -1 is in good accord with hardening caused by the back stress generated by dislocations piling up at a diffuse barrier caused by the reduction of stress near the neutral axis. The macro scale CRSS values were used to successfully simulate deformation of a conventional macroscopic compression test. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd.
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