Quantitative Atomic Force Microscopy Characterization and Crystal Plasticity Finite Element Modeling of Heterogeneous Deformation in Commercial Purity Titanium

Yang, Yunfan; Wang, Leyun; Bieler, T. R.; Eisenlohr, Philip; Crimp, M. A.

doi:10.1007/s11661-010-0475-0

Cited by 61 publications

(20 citation statements)

References 25 publications

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“…This microstructural patch has been modeled using crystal plasticity finite element simulations, using two microstructure geometries, including a columnar microstructure based on an OIM map. Clearly such a columnar geometry is not realistic, but it is convenient, and simulations provide rough agreement with experimental observations (see [39]). Recently, this microstructure was characterized non-destructively in three dimensions using differential aperture X-ray microscopy (DAXM), which provides crystal orientation information at about 1 µm spatial resolution up to depths of about 100-200 µm [55].…”

Section: Slip Transfer In Hexagonal Metalsmentioning

confidence: 99%

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Grain boundaries and interfaces in slip transfer

Bieler¹,

Eisenlohr²,

Zhang³

et al. 2014

Current Opinion in Solid State and Materials Science

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283

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The effect of slip transfer on heterogeneous deformation of polycrystals has been a topic of recurring interest, as this process can either lead to the nucleation of damage, or prevent nucleation of damage. This paper examines recent experimental characterization of slip transfer in tantalum, TiAl, and Ti alloys. The methods used to analyze and assess evidence for the occurrence of slip transfer are discussed. Comparisons between a characterized and simulated patch of microstructure are used to illustrate synergy that leads to new insights that cannot arise with either approach alone. (C) 2014 Published by Elsevier Ltd

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Section: Slip Transfer In Hexagonal Metalsmentioning

confidence: 99%

“…In-situ tensile deformation in scanning electron microscopy has also been carried out using pre-polished samples with a gage length of 10 mm and a 2 × 3 mm 2 cross section. The details of sample preparation and deformation are provided in [37][38][39][40][41].…”

Section: Experimental Descriptionmentioning

confidence: 99%

Grain boundaries and interfaces in slip transfer

Bieler¹,

Eisenlohr²,

Zhang³

et al. 2014

Current Opinion in Solid State and Materials Science

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283

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“…A technique combining AFM and EBSD-based trace analysis was recently developed to quantitatively measure the local dislocation shear activity associated with activated deformation systems in different grains. 14 Figure 3 displays a high magnification BSE image of an example of dislocation slip lines, as well as an AFM image of the same area measuring the surface height change due to the slip lines.…”

Section: Experimental Assessmentmentioning

confidence: 99%

Characterization and modeling of heterogeneous deformation in commercial purity titanium

Yang

Wang

Zambaldi

et al. 2011

JOM

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How would you… …describe the overall significance of this paper? Crystal plasticity finite element constitutive models with phenomenological hardening rules are insufficient to predict the evolution of heterogeneous deformation that precedes damage nucleation near grain boundaries. …describe this work to a materials science and engineering professional with no experience in your technical specialty? The mechanisms that govern dislocation and twin interactions with grain boundaries (slip transfer rules) need to be identified so that models can be developed, implemented, and validated. …describe this work to a layperson? This research program seeks to discover how a crack becomes a crack when there was no crack before. With this knowledge, improvements in material performance can be developed for a wide range of applications.

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“…While both of the above approaches generate heterogeneous deformation in different parts of a given grain that is similar to experimental observations, the agreement between such models and experimental measurements with the same grain sizes and textures has not been fully convincing. For example, comparisons between experimental measurements of activated SS and simulations of the same (usually simplified) microstructure often show good agreement about which SS are activated, but the agreement is worse in regions near GBs and triple points (Yang et al, 2011;Lim et al, 2015). One reason for these differences is that the finite element model intrinsically provides no properties of GBs and heterogeneous deformation arises from the discontinuity in properties on either side of the boundary.…”

Section: Introductionmentioning

confidence: 99%

Effect of slip transmission at grain boundaries in Al bicrystals

Haouala

Alizadeh

Bieler

et al. 2020

International Journal of Plasticity

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The effect of slip transfer on the deformation mechanisms of Al bicrystals was explored using a rate-dependent dislocation-based crystal plasticity model. Three different types of grain boundaries (GBs) were included in the model by modifying the rate of dislocation accumulation near the GB in the Kocks-Mecking law, leading to fully-opaque (dislocation blocking), fully-transparent and partially-transparent GBs. In the latter, slip transmission is only allowed in pairs of SS in neighbour grains that are suitably oriented for slip transfer according to the Luster-Morris parameter. Modifications of the GB character led to important changes in the deformation mechanisms at the GB. In general, bicrystals with fully-opaque boundaries showed an increase in the dislocation density near the GB, which was associated with an increase in the Von Mises stress. In contrast, the dislocation pile-ups and the stress concentration were less pronounced in the case of partially-transparent boundaries as the slip in one grain can progress into the next grain with some degree of continuity. No stress concentrations were found at these boundaries for fully-transparent boundaries, and there was continuity of strain across the boundary, which is not typical of most experimentally observed GBs (Hémery et al., 2018;Bieler et al., 2019). Simulations of ideal bicrystals oriented for favorable slip transfer on the most highly favored slip system in grains with high Schmid factors for slip transfer depends on the number of active SS in * Corresponding author. operation in the neighborhood and that most boundaries will lead to nearly opaque conditions while some boundaries will be transparent. Finally, the model was applied to a particular experimentally observed GB in which slip transfer was clearly operating indicating that the model predicted a nearly transparent GB.

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Quantitative Atomic Force Microscopy Characterization and Crystal Plasticity Finite Element Modeling of Heterogeneous Deformation in Commercial Purity Titanium

Cited by 61 publications

References 25 publications

Grain boundaries and interfaces in slip transfer

Grain boundaries and interfaces in slip transfer

Characterization and modeling of heterogeneous deformation in commercial purity titanium

Effect of slip transmission at grain boundaries in Al bicrystals

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