Polyphase crystal plasticity for high strain rate: Application to twinning and retwinning in tantalum

Bruzy, Nicolas; Denoual, Christophe; Vattré, A.

doi:10.1016/j.jmps.2022.104921

Cited by 6 publications

(1 citation statement)

References 63 publications

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“…As thoroughly discussed in the literature, in these loading conditions, GBs and triple junction (TJ) points are the most important sites for twin formation at the initial stages of the induced plastic deformation in coarse-grained Ta samples. This was attributed to the development of highly localized stress fields in these regions [79][80][81][82] . To examine this issue for the present samples, we monitored the twin formation employing the CSP method (see Fig.…”

Section: Low Strain Rate Plastic Deformation Mechanisms: Dislocation-...mentioning

confidence: 99%

Strain-rate-dependent plasticity of Ta-Cu nanocomposites for therapeutic implants

Kardani,

Montazeri,

Urbassek

2023

Sci Rep

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Recently, Ta/Cu nanocomposites have been widely used in therapeutic medical devices due to their excellent bioactivity and biocompatibility, antimicrobial property, and outstanding corrosion and wear resistance. Since mechanical yielding and any other deformation in the patient's body during treatment are unacceptable in medicine, the characterization of the mechanical behavior of these nanomaterials is of great importance. We focus on the microstructural evolution of Ta/Cu nanocomposite samples under uniaxial tensile loading conditions at different strain rates using a series of molecular dynamics simulations and compare to the reference case of pure Ta. The results show that the increase in dislocation density at lower strain rates leads to the significant weakening of the mechanical properties. The strain rate-dependent plastic deformation mechanism of the samples can be divided into three main categories: phase transitions at the extreme strain rates, dislocation slip/twinning at lower strain rates for coarse-grained samples, and grain-boundary based activities for the finer-grained samples. Finally, we demonstrate that the load transfer from the Ta matrix to the Cu nanoparticles via the interfacial region can significantly affect the plastic deformation of the matrix in all nanocomposite samples. These results will prove useful for the design of therapeutic implants based on Ta/Cu nanocomposites.

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Section: Low Strain Rate Plastic Deformation Mechanisms: Dislocation-...mentioning

confidence: 99%

Strain-rate-dependent plasticity of Ta-Cu nanocomposites for therapeutic implants

Kardani,

Montazeri,

Urbassek

2023

Sci Rep

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Dual-interface model for twinning in the coupled crystal plasticity finite element – Phase field method

Liu

Mao

et al. 2022

International Journal of Plasticity

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Dislocation storage-release-recovery model for metals under strain rates from 10−3 to 107 s−1, and application to tantalum

Denoual,

Pellegrini,

Lafourcade

et al. 2024

Journal of Applied Physics

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Extending the storage-recovery model, we propose a new strengthening model, premised on detailed evolution laws for both mobile and immobile dislocations, for metals under moderate to intense loading. These dislocation density evolution laws include the multiplication, storage under the effect of dislocation junctions, release of pinned dislocations, and annihilation by cross-slip. The storage-release description is derived from a simplified depiction of the probability distribution function of the dislocation length in dislocation networks. Although the model requires only few parameters to characterize the evolution of dislocation densities, remarkable agreement is found with available experimental data. From a theoretical study of the long-time behavior of the model, analytical expressions are provided to easily extract most of these parameters from experimental stress–strain curves in the quasi-static regime, whereas the parameter that governs the strength of the release process is adjusted from dynamic tensile tests. Their values so determined for polycrystalline tantalum allow the model to reproduce experimental plate-impact data with a very good match.

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Polyphase crystal plasticity for high strain rate: Application to twinning and retwinning in tantalum

Cited by 6 publications

References 63 publications

Strain-rate-dependent plasticity of Ta-Cu nanocomposites for therapeutic implants

Strain-rate-dependent plasticity of Ta-Cu nanocomposites for therapeutic implants

Dual-interface model for twinning in the coupled crystal plasticity finite element – Phase field method

Dislocation storage-release-recovery model for metals under strain rates from 10−3 to 107 s−1, and application to tantalum

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