Grain-boundary sliding and separation in polycrystalline metals: application to nanocrystalline fcc metals

By Yujie Wei, L. Anand. 2004

315 citations recorded by the source corpus.

Abstract In order to model the effects of grain boundaries in polycrystalline materials we have coupled a crystal-plasticity model for the grain interiors with a new elastic–plastic grain-boundary interface model which accounts for both reversible elastic, as well irreversible inelastic sliding-separation deformations at the grain boundaries prior to failure. We have used this new computational capability to study the deformation and fracture response of nanocrystalline nickel. The results from the simulations reflect the macroscopic experimentally observed tensile stress–strain curves, and the dominant microstructural fracture mechanisms in this material. The macroscopically observed nonlinearity in the stress–strain response is mainly due to the inelastic response of the grain boundaries. Plastic deformation in the interior of the grains prior to the formation of grain-boundary cracks was rarely observed. The stress concentrations at the tips of the distributed grain-boundary cracks, and at grain-boundary triple junctions, cause a limited amount of plastic deformation in the high-strength grain interiors. The competition of grain-boundary deformation with that in the grain interiors determines the observed macroscopic stress–strain response, and the overall ductility. In nanocrystalline nickel, the high-yield strength of the grain interiors and relatively weaker grain-boundary interfaces account for the low ductility of this material in tension.

Subfields: Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/4549672025f4ad6a042c304e071f0b97b979f5c3

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In Mechanical Engineering

Citations in the corpus

A unified scheme for prediction of effective moduli of multiphase composites with interface effects. Part I: Theoretical framework (2007, methodology): “As mentioned before, the linear-spring model can be used to simulate a thin and compliant interphase (Hashin, 1991; Wei and Anand, 2004; Wang et al., 2005).”
Large-scale 3D random polycrystals for the finite element method: Generation, meshing and remeshing (2011, unknown): “This can lead to strong artefacts in the prediction of grain-scale surface roughening [22], grain boundary sliding in nanocrystalline materials [23] or in local micromechanical approaches of fracture in bainite [24].”
Overview of constitutive laws, kinematics, homogenization and multiscale methods in crystal plasticity finite-element modeling: Theory, experiments, applications (2010, background): “in glassy matter) [208,209], mechanical twinning [164–166,169] and even superplastic grain boundary shear [41,45].”
Molecular-dynamics simulation-based cohesive zone representation of intergranular fracture processes in aluminum (2006, methodology): “Grain-scale simulations that use cohesive zone models to study fracture (such as those presented by Zavattieri et al. (2001; 2003), Iesulauro et al. (2002), and Wei and Anand (2004)) typically use heuristically derived relationships and input values to define the CZM.”
Multi-phase-field modeling of anisotropic crack propagation for polycrystalline materials (2017, unknown): “[51], CZMwas used to simulate the grain boundary sliding and separation in nanocrystalline metals.”
Atomistic based continuum investigation of plastic deformation in nanocrystalline copper (2006, methodology): “The finite element simulations done by Wei and Anand (2004) address this issue by using cohesive elements to describe the GB while describing the intragranular behavior with a classical crystal plasticity model having input parameters corresponding to nanometer sized grains.”
Crystal Plasticity Finite Element Methods: in Materials Science and Engineering (2010, background): “, 2002; Salem, Kalidindi, and Semiatin, 2005; Staroselsky and Anand, 1998), and even superplastic grain boundary shear (Wei and Anand, 2004; Wei, Su, and Anand, 2006).”
Gradient plasticity in gradient nano-grained metals (2016, unknown): “For each grain, the slip resistance parameters, including {s0, h0, a, ssat, m}, are taken as functions of grain size [18,19].”