< a > Prismatic, < a > basal, and < c plus a > slip strengths of commercially pure Zr by micro-cantilever tests
File(s)
Published version
Author(s)
Gong, J
Britton, TB
Cuddihy, MA
Dunne, FPE
Wilkinson, AJ
Type
Journal Article
Abstract
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 μm to 10 μm wide, oriented for single slip were prepared using focused ion beam (FIB) machining and subsequently deflected using a nanoindenter. The critical resolved shear stress (τcrss) 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 α-Zr show a marked size effect in bending described well by τCRSS(W) = τ0 + AWn, where W is the cantilever width, τ0 is the CRSS at the macro scale and n = ∼−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.
Date Issued
2015-09-01
Date Acceptance
2015-06-08
Citation
Acta Materialia, 2015, 96, pp.249-257
ISSN
1873-2453
Publisher
Elsevier
Start Page
249
End Page
257
Journal / Book Title
Acta Materialia
Volume
96
Copyright Statement
© 2015 Acta Materialia Inc. Published by Elsevier Ltd. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/).
(http://creativecommons.org/licenses/by/4.0/).
License URL
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/K034332/1
Subjects
Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Zirconium
Micro-cantilever test
Slip properties
Anisotropy
CRSS
ZIRCONIUM SINGLE-CRYSTALS
MECHANICAL-PROPERTIES
DEFORMATION
PLASTICITY
HCP
BEHAVIOR
COPPER
TEXTURE
STRAIN
TI
Publication Status
Published