< a > Prismatic, < a > basal, and < c plus a > slip strengths of commercially pure Zr by micro-cantilever tests by Gong, J, Britton, T, Cuddihy, M, Dunne, F, Wilkinson, A

“…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. …”

A microcantilever investigation of size effect, solid-solution strengthening and second-phase strengthening for < a > prism slip in alpha-Ti by Gong, J, Wilkinson, A

“…Such a variation of CRSS with beam size is well accounted for by the increased back stress generated by dislocations piling up at the neutral axis. The CRSS values extrapolated to infinite sample size are 86 MPa for the CP-Ti, 308 MPa for the Ti-6Al and 444 MPa for the 〈a 3〉 slip in the Ti-6Al-4V. © 2011 Acta Materialia Inc. …”

prismatic, basal, and slip strengths of commercially pure Zr by micro-cantilever tests by Wilkinson, A

“…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. …”

A high resolution electron backscatter diffraction study of heterogeneous deformation in polycrystal copper by Jiang, J

“…Hence new models have been proposed that these GND structures might be generated from the intersections of different slip systems which occurred in various parts of a grain, or by the dislocation piling-up at some microstructural features e.g. triple junctions and twin boundaries.…”

Stress fields and geometrically necessary dislocation density distributions near the head of a blocked slip band by Benjamin Britton, T, Wilkinson, A

“…This pile-up has resulted in activation of plasticity in the neighbouring grain and left the boundary with a number of dislocations in a pile-up. …”

Measurements of stress fields near a grain boundary: Exploring blocked arrays of dislocations in 3D by Guo, Y, Collins, D, Tarleton, E, Hofmann, F, Tischler, J, Liu, W, Xu, R, Wilkinson, A, Britton, T

“…The interaction between dislocation pile-ups and grain boundaries gives rise to heterogeneous stress distributions when a structural metal is subjected to mechanical loading. …”

Mechanical properties of ion-implanted tungsten-5wt% tantalum by Armstrong, D, Wilkinson, A, Roberts, S

“…In the unimplanted condition there is an extensive pile-up around the indentation. At damage levels of 0.07 and 1.2 dpa the extent and height of pile-up are much less. …”

A discrete dislocation plasticity study of the micro-cantilever size effect by Tarleton, E, Balint, D, Gong, J, Wilkinson, A

“…However, there are notable differences, including a strong source density dependence of the size effect that cannot be explained by geometrically necessary dislocation (GND) arguments, and the effect of the cantilever stress distribution on the locations of soft pile-ups. The planar model was used to identify zero resolved shear stress isolines, rather than the neutral axis, as controlling the soft pile-up location, and source spacing as limiting the slip band spacing in the observed size effect; strengthening was much greater in the source-limited regime. …”

Geometrically necessary dislocation density distributions in cyclically deformed Ti-6Al-4V by Littlewood, P, Wilkinson, A

“…As has been proposed in models of facet fatigue formation, an example is presented of the accumulation, within a soft grain, of GNDs in a diffuse pile-up against a grain boundary with a hard grain. © 2012 Acta Materialia Inc. …”

Transmission electron microscopy of deformed Ti-6Al-4V micro-cantilevers by Ding, R, Gong, J, Wilkinson, A, Jones, I

“…Even in the sample with a small deflection, i.e. 0.5μm, dislocations were observed at the bottom of the cantilever, but dislocations were not observed at the top until the deflection reached 3μm. Pile-ups pushed the dislocations past the neutral line when the micro-cantilevers were deflected to more than 4m. © 2012 Taylor and Francis.…”

The interactions between slip band, deformation twins and grain boundaries in commercial purity titanium by Guo, Y

“…It was found that the level of stress intensity correlates well with the number of dislocations within the pile up plane.</p> <p>The slip band and grain boundary interaction case that led to the highest magnitude of stress intensity factor was further investigated using DAXM experiments. …”