A gradient plasticity creep model accounting for slip transfer/activation at interfaces evaluated for the intermetallic NiAl-9Mo

Albiez, J.; Erdle, Hannes; Weygand, D.; Böhlke, Thomas

doi:10.1016/j.ijplas.2018.10.006

Cited by 19 publications

(7 citation statements)

References 87 publications

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“…Slip transfer has been introduced into other models, e.g. [11][12][13]. Nevertheless, a reliable criterion that uses the misorientation between slip planes and Burgers vectors across the boundary to predict the likelihood of slip transfer is not available and this is the main objective of this investigation.…”

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confidence: 99%

A criterion for slip transfer at grain boundaries in Al

et al. 2020

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The slip transfer phenomenon was studied at the grain boundaries of pure Aluminum by means of slip trace analysis. Either slip transfer or blocked slip was analyzed in more than 250 grain boundaries and the likelihood of slip transfer between two slip systems across the boundary was assessed. The experimental results indicate that slip transfer was very likely to occur if the residual Burgers vector, ∆b, was below 0.35b and the Luster-Morris parameter was higher than 0.9, and that the ratio of the Luster-Morris parameter and the residual Burgers vector has a threshold above which slip transfer is probable.

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confidence: 99%

A criterion for slip transfer at grain boundaries in Al

et al. 2020

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“…Here, 𝑴 𝜉 denotes the Schmid tensor of slip system 𝜉. The accumulated plastic slip 𝛾 ac is defined by its rate as the sum of the plastic slip rate in each slip system γac = ∑ 𝑁 𝜉=1 | γ𝜉 |, compare, for example, [17]. For a slip system 𝜉, the projection of the Cauchy stress and the Schmid tensor yields the resolved shear stress 𝜏 𝜉 with 𝜏 𝜉 = 𝝈 ⋅ 𝑴 𝜉 .…”

Section: Constitutive Equations Of Cpmentioning

confidence: 99%

Investigation of microstructure evolution accounting for crystal plasticity in the multiphase‐field method

Kannenberg,

Schöller,

Prahs

et al. 2023

Proc Appl Math and Mech

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Regarding microstructured materials, a quantitative prediction of phase transformation processes is highly desirable for a wide range of applications. With respect to polycrstalline materials, the plastic material behavior is commonly investigated using a crystal plasticity (CP) theory, since it accounts for the underlying microstructure, that is, slip systems of the crystal lattice. In classical continuum mechanics, grain boundaries (GBs) are commonly modeled as material singular surfaces. However, the tracking of moving GBs, present during phase transformation processes, is numerically challenging and costly. This can be circumvented by the use of a multiphase‐field method (MPFM), which provides a numerically highly efficient method for the treatment of moving interfaces, considered as diffuse interfaces of finite thickness. In this work, the microstructural evolution is investigated within the MPFM accounting for CP. The implementation of the constitutive material behavior within the diffuse interface region accounts for phase‐specific plastic fields and the jump condition approach. To improve the understanding of the impact of plastic deformation on the phase evolution, a single inclusion problem is analyzed. Within a plastically deformed matrix, the shape evolution of a purely elastic inclusion with a different Young's modulus, referred to as inhomogeneity, is investigated. It is shown, how the anisotropic plastic behavior affects the phase evolution. The resulting equilibrium shapes are illustrated and examined.

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“…A userdefined subroutine (UMAT in ABAQUS, developed at the Mechanics Institute of Otto-von-Guericke-University Magdeburg, Germany) realized such FE simulations. This UMAT is already applied for different materials with non-identical crystal structures under different loading conditions [23][24][25][26][27][28][29][30][31]. The applied material model, including the homogenization method, is briefly described in Section 3.1.1 for discussion.…”

Section: Materials Lawmentioning

confidence: 99%

Many-Scale Investigations of Deformation Behavior of Polycrystalline Composites: II—Micro-Macro Simultaneous FE and Discrete Dislocation Dynamics Simulation

et al. 2022

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The current work numerically investigates commercial polycrystalline Ag/17vol.%SnO2 composite tensile deformation behavior with available experimental data. Such composites are useful for electric contacts and have a highly textured initial material status after hot extrusion. Experimentally, the initial sharp fiber texture and the number of Σ3-twins were reduced due to tensile loading. The local inhomogeneous distribution of hardness and Young’s modulus gradually decreased from nanoindentation tests, approaching global homogeneity. Many-scale simulations, including micro-macro simultaneous finite element (FE) and discrete dislocation dynamics (DDD) simulations, were performed. Deformation mechanisms on the microscale are fundamental since they link those on the macro- and nanoscale. This work emphasizes micromechanical deformation behavior. Such FE calculations applied with crystal plasticity can predict local feature evolutions in detail, such as texture, morphology, and stress flow in individual grains. To avoid the negative influence of boundary conditions (BCs) on the result accuracy, BCs are given on the macrostructure, i.e., the microstructure is free of BCs. The particular type of 3D simulation, axisymmetry, is preferred, in which a 2D real microstructural cutout with 513 Ag grains is applied. From FE results, Σ3-twins strongly rotated to the loading direction (twins disappear), which, possibly, caused other grains to rotate away from the loading direction. The DDD simulation treats the dislocations as discrete lines and can predict the resolved shear stress (RSS) inside one grain with dependence on various features as dislocation density and lattice orientation. The RSS can act as the link between the FE and DDD predictions.

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A gradient plasticity creep model accounting for slip transfer/activation at interfaces evaluated for the intermetallic NiAl-9Mo

Cited by 19 publications

References 87 publications

A criterion for slip transfer at grain boundaries in Al

A criterion for slip transfer at grain boundaries in Al

Investigation of microstructure evolution accounting for crystal plasticity in the multiphase‐field method

Many-Scale Investigations of Deformation Behavior of Polycrystalline Composites: II—Micro-Macro Simultaneous FE and Discrete Dislocation Dynamics Simulation

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