Quantifying deformation processes near grain boundaries in α titanium using nanoindentation and crystal plasticity modeling

Su, Yang; Zambaldi, Claudio; Mercier, David; Eisenlohr, Philip; Bieler, T. R.; Crimp, M. A.

doi:10.1016/j.ijplas.2016.08.007

Cited by 62 publications

(19 citation statements)

References 76 publications

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“…While there is much discussion of slip transfer in the literature, there is relatively little experimental quantification of thresholds for observed slip transfer. From the experimental perspective, thresholds for slip transfer have been identified in nano-indentation experiments (Su et al, 2016;Xiao et al, 2017), and thresholds for specific boundaries have been identified in cantilever beam bending tests [Ding et al, 2016]. Analysis of slip stimulated mechanical twinning in Ti using surface electron back-scatter diffraction (EBDS) orientation measurements showed that slip transfer that nucleated mechanical twins was probable when " = cos cos > 0.9 (Wang et al, 2010), where ψ and κ are the angles between the slip plane normal and the Burgers vector directions, respectively, for each combination of slip systems 1 .…”

Section: Introductionmentioning

confidence: 99%

An analysis of (the lack of) slip transfer between near-cube oriented grains in pure Al

Bieler

Alizadeh

Peña-Ortega

et al. 2019

International Journal of Plasticity

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125

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Slip transfer across grain boundaries was studied in annealed polycrystalline Al foils deformed in uniaxial tension by means of the analysis of the slip traces on the specimen surface. Grain orientations and selected grain boundary misorientations were measured on both surfaces of the sample using electron back-scattered diffraction mapping. It was found that most of the grains were within 15° of a cube orientation and approximately half of the grains percolated through the specimen thickness. The Luster-Morris " parameter (that can be computed from the surface grain orientation) was used to assess the likelihood of slip transfer across boundaries. It was found that transfer across grain boundaries was rare in near-cube oriented grains, and convincing evidence was only found when " > 0.97, which corresponds to lowangle boundaries with <15º misorientation. This behavior was explained by the presence of many active slip slips in near-cube oriented grains that favor self-accommodation of the grain shape to the evolving boundary conditions imposed by neighboring grains instead of promoting slip transfer across the boundary. These results indicate that the alignment between slip planes and slip directions across the boundary is not the only important metric to determine the threshold for slip transfer, as the particular details of deformation in each grain (such as the number of available slip systems) also must be considered.

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Section: Introductionmentioning

confidence: 99%

An analysis of (the lack of) slip transfer between near-cube oriented grains in pure Al

Bieler

Alizadeh

Peña-Ortega

et al. 2019

International Journal of Plasticity

Self Cite

125

View full text Add to dashboard Cite

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“…The second is due to the real effect that indents close to grain boundaries respond differently to indents performed in the centre of grains. Plastic zones that impinge upon grain boundaries can cause dislocation pile-up and slip transmission, or the grain boundary might act as a dislocation source/sink itself, strongly affecting measured hardness [50][51][52][53][54][55][56]. In order to avoid the influence of grain boundary-associated variation, and capitalising on the wealth of data available, points can be isolated based on spatial location relative to the microstructure.…”

Section: Dataset 0-nanoindentation Comparisons and Tip Calibration Persistencementioning

confidence: 99%

Nanoindentation in multi-modal map combinations: a correlative approach to local mechanical property assessment

Magazzeni

Gardner

Howe

et al. 2021

Journal of Materials Research

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A method is presented for the registration and correlation of property maps of materials, including data from nanoindentation hardness, Electron Back-Scattered Diffraction (EBSD), and Electron Micro-Probe Analysis (EPMA). This highly spatially resolved method allows for the study of micron-scale microstructural features, and has the capability to rapidly extract correlations between multiple features of interest from datasets containing thousands of data points. Two case studies are presented in commercially pure (CP) titanium: in the first instance, the effect of crystal anisotropy on measured hardness and, in the second instance, the effect of an oxygen diffusion layer on hardness. The independently collected property maps are registered using affine geometric transformations and are interpolated to allow for direct correlation. The results show strong agreement with trends observed in the literature, as well as providing a large dataset to facilitate future statistical analysis of microstructure-dependent mechanisms. Graphical abstract

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“…Grain boundaries are assumed to be transparent for slip transfer in standard (phenomenological) CP models and, thus, the effect of the grain boundary on the slip transmission is not accounted for. Physically-based CP models can introduce the effect of grain boundaries through different parameters that take into account the increase in dislocation density near the grain boundary (Mayeur et al, 2015;Su et al, 2016;Hauoala et al, 2018). Finally, lowerorder SGCP account for the effect grain boundaries through the density of GNDs generated near the boundaries due to the deformation incompatibility between grains with different orientations, while higher-order SGCP can control the dislocation flux across the boundary by means of the higher-order boundary conditions.…”

Section: Concluding Remarks and Future Developmentsmentioning

confidence: 99%

Computational Homogenization of Polycrystals

Segurado

Lebensohn

LLorca

2018

Advances in Applied Mechanics

111

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This paper reviews the current state-of-the-art in the simulation of the mechanical behavior of polycrystalline materials by means of computational homogenization. The key ingredients of this modelling strategy are presented in detail starting with the parameters needed to describe polycrystalline microstructures and the digital representation of such microstructures in a suitable format to perform computational homogenization. The different crystal plasticity frameworks that can describe the physical mechanisms of deformation in single crystals (dislocation slip and twinning) at the microscopic level are presented next. This is followed by the description of computational homogenization methods based on mean-field approximations by means of the viscoplastic self-consistent approach, or on the full-field simulation of the mechanical response of a representative polycrystalline volume element by means of the finite element method or the fast Fourier transform-based method. Multiscale frameworks based on the combination of mean-field homogenization and the finite element method are presented next to model the plastic deformation of polycrystalline specimens of arbitrary geometry under complex mechanical loading. Examples of application to predict the strength, fatigue life, damage, and texture evolution under different conditions are presented to illustrate the capabilities of the different models. Finally, current challenges and future research directions in this field are summarized.

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Quantifying deformation processes near grain boundaries in α titanium using nanoindentation and crystal plasticity modeling

Cited by 62 publications

References 76 publications

An analysis of (the lack of) slip transfer between near-cube oriented grains in pure Al

An analysis of (the lack of) slip transfer between near-cube oriented grains in pure Al

Nanoindentation in multi-modal map combinations: a correlative approach to local mechanical property assessment

Computational Homogenization of Polycrystals

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