Dislocation and back stress dominated viscoplasticity in freestanding sub-micron Pd films

Lemoine, Guerric; Delannay, Laurent; Idrissi, Hosni; Pardoen, Thomas

doi:10.1016/j.actamat.2016.03.038

Cited by 12 publications

(3 citation statements)

References 82 publications

(111 reference statements)

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“…The works that modify and enhance the basic model include [13][14][15][16][17][18][19][20]. The problems studied with versions of Kocks-Mecking model include the influence of grain size and grain boundaries on the properties of the polycrystals [21][22][23], changing loading paths and latent hardening [24][25][26], thin film deformation [27,28], void growth and interaction [29,30] and multiphase alloys [31].…”

Section: Introductionmentioning

confidence: 99%

Deformation and strain localization in polycrystals with plastically heterogeneous grains

Khadyko

Marioara

Ringdalen

et al. 2016

International Journal of Plasticity

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A model of a polycrystalline material is studied, where each grain consists of several zones with different plastic properties. The size and configuration of the zones as well as their properties are mimicking the situation inside the crystals of artificially aged Al alloys with precipitate free zones (PFZs). The properties of the different zones are conjectured based on micromechanical models and experimental observations of the AA6000 series of Al alloys. A periodic patch of such a composite material, subjected to plane-strain tension, is modelled using the finite element method. The material behaviour is described by a single crystal plasticity model. The results of the simulations show a number of characteristic features emerging in composite material systems, including sliding and distortion of grain boundaries and shear band formation at grain boundary triple points. The assumptions made about the properties of the different zones in the crystals are evaluated. The distributions of plastic strain and deviatoric and hydrostatic stresses in the composite crystalline systems are discussed.

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Section: Introductionmentioning

confidence: 99%

Deformation and strain localization in polycrystals with plastically heterogeneous grains

Khadyko

Marioara

Ringdalen

et al. 2016

International Journal of Plasticity

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“…The solver is combined with the gmsh open source three-dimensional finite elementmesh generator with a built-in CAD engine [39]. The CM3 libraries FEM solver was developed in the Aerospace and Mechanical Engineering Department of Liege University in Belgium, whereas the crystal plasticity routine was developed by Delannay et al [40][41].…”

Section: Cpfem For the Nanoindentation Of Pure Ironmentioning

confidence: 99%

High temperature nanoindentation of iron: Experimental and computational study

Khvan

Noels

Terentyev

et al. 2022

Journal of Nuclear Materials

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“…Relaxation tests are particularly well adapted for nanocrystalline materials, for which several mechanisms are in competition [14,15]: many studies reveal dislocation nucleations and propagations [16,17,18], diffusion [19,20,21], grain boundary sliding, migration, rotation or growth [22,23,24,25,26,27] -these mechanisms often cooperate and accommodate one another. It is hoped that the activation volume determination will be a method to characterize macroscopically the leading plasticity mechanism operating in the material [28,29,10,30,31,32,33]. Moreover, the thermodynamic instability of nanocrystalline metals being evidenced by the potential grain growth [34,23], it is relevant to monitor the relaxation of a nanocrystalline sample all along a stress-strain curve.…”

Section: Introductionmentioning

confidence: 99%

X-ray diffraction and stress relaxations to study thermal and stress-assisted annealings in nanocrystalline gold thin films

et al. 2019

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The dependence on thermal history of the plasticity mechanisms occurring in nanocrystalline gold thin films is evidenced thanks to relaxation tests combined with in-situ synchrotron X-ray diffraction. The two techniques complement one another. The activation parameters show that the films deform mainly by dislocations and give indications about their mean free paths, whereas the Bragg peak positions, widths and areas bring invaluable information on residual stress as well as on some plasticity properties, like dislocation storage inside the grains or grain rotations. For the demonstration, two sputter-deposited nanocrystalline 50 nm-thin films deposited onto stretchable substrates are studied. It is shown that an as-grown sample (at a homologous temperature of 0.22) presents a stress-assisted annealing, thus decreasing its initial defect density, whereas if a thermal annealing (three hours at 200°C, corresponding to a homologous temperature of 0.35) has been applied to the sample before the tensile test, it deforms by conventional plasticity, and the dislocations are not stored inside the grains. These mechanisms lead to different work-hardening properties. This work shows how a moderate annealing can have a profound influence on the mechanical behaviour of these thin films.

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Dislocation and back stress dominated viscoplasticity in freestanding sub-micron Pd films

Cited by 12 publications

References 82 publications

Deformation and strain localization in polycrystals with plastically heterogeneous grains

Deformation and strain localization in polycrystals with plastically heterogeneous grains

High temperature nanoindentation of iron: Experimental and computational study

X-ray diffraction and stress relaxations to study thermal and stress-assisted annealings in nanocrystalline gold thin films

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