Phase field modeling of V2O5 hot corrosion kinetics in thermal barrier coatings

Abubakar, Abba Abdulhamid; Akhtar, Syed Sohail; Arif, Abul Fazal M.

doi:10.1016/j.commatsci.2014.12.004

Cited by 58 publications

(28 citation statements)

References 33 publications

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“…8,9. A is the free energy density curvature which is often identified from thermodynamical databases [40,27].…”

Section: Electrochemical Energymentioning

confidence: 99%

“…For easier numerical implementation, all parameters will be normalized following the work by [40,27]. In the situation, where the passive is dissolved (totally for the case of weak passive film and partially for the case of Lacy cover film) along with metal, the obtained results are plotted in Fig.…”

Section: Materials Parametersmentioning

confidence: 99%

“…However, a method to describe all aspects of electrochemical and mechanical processes inducing material dissolution or fracture growth is still missing. This work started from ideas presented in the work of [25,27] where the KKS (Kim-Kim-Suzuki) model [11] is adopted with new normalization procedures to describe the dissolution processes (phase transformation from solid to liquid). We propose herein a coupling with mechanical equilibrium to model dissolution induced SCC.…”

Section: Introductionmentioning

confidence: 99%

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A phase field method for modeling anodic dissolution induced stress corrosion crack propagation

et al. 2018

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The phase field method is a powerful tool for studying microstructural evolution in various domains of material sciences, including phase change, initiation and propagation of fracture. In this work, a new formulation is developed based on the phase field method for modeling stress corrosion cracking (SCC) induced by anodic dissolution. This method was applied for modelling SCC of an aluminum alloy (2xxx series) in a saline medium (NaCl), which allows considering the effects of both electrochemical and mechanical processes. The classical phase transition model for material dissolution is coupled with the mechanical problem in a robust manner, providing an efficient tool for studying the competition between electrochemical and mechanical contributions to fracture. A numerical implementation based on finite elements is elaborated. The numerical results are compared to experimental data obtained by in situ microtomography.

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“…8,9. A is the free energy density curvature which is often identified from thermodynamical databases [40,27].…”

Section: Electrochemical Energymentioning

confidence: 99%

Section: Materials Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A phase field method for modeling anodic dissolution induced stress corrosion crack propagation

et al. 2018

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“…where is the free energy density curvature which is often identified from thermodynamical databases [29,30]; and are the equilibrium concentrations of the coexisting phases; the concentration of solid and liquid phases can be expressed from the equilibrium condition at the transition zone as follows:…”

Section: Phase Field Modelmentioning

confidence: 99%

“…The bulk modulus is defined as 0 = ( 0 11 + 2 0 12 )/3 = 96.26 GPa. For easier numerical implementation, all parameters are normalized following the work by [29,30].…”

Section: Representative Numerical Examplesmentioning

confidence: 99%

Modeling of inter- and transgranular stress corrosion crack propagation in polycrystalline material by using phase field method

Nguyen

Réthoré

Baietto

et al. 2017

Journal of the Mechanical Behavior of Materials

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A coupled multiphysics phase field framework is proposed to model anodic dissolution induced by stress corrosion fracture growth at microstructual level. The effects of electrochemical-mechanical processes (including crystal anisotropy) are all taken into account. This new model is based upon: (i) an anisotropic phase transformation model based on a variational formulation to describe material dissolution along preferential directions; (ii) an efficient description of grain boundaries as a smeared cohesive zone; (iii) an explicit approximation to model the different electrochemical behaviors between grain boundary and grain interior. Both intergranular and transgranular stress corrosion cracking is simulated in an efficient manner. The abilities of the proposed model are illustrated through several numerical examples involving a full prediction of complex crack network growth induced by stress corrosion cracking within 2D polycrystaline models.

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Degradation Mechanism of Vanadium Oxide Films When Grown on Y‐Stabilized ZrO₂ Above 500 °C

Choi

Lee

et al. 2019

Adv Eng Mater

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Although vanadium oxide (VOx) phases are thermodynamically similar, Y‐stabilized ZrO2 (YSZ) substrates show selective growth as single‐crystalline films. However, in this study, we find that the films degrade with the formation of nanoislands when evaporating VOx onto YSZ at a substrate temperature >500 °C. The nanoislands are epitaxial, i.e., Y‐doped VO2(R) at an oxygen partial pressure PO2 < 30 mTorr, and YVO4 at PO2 > 50 mTorr. Energy‐dispersive X‐ray spectroscopy shows that the rapid diffusion of vanadium and yttrium plays a critical role in film degradation. The degradation mechanism revealed herein guides the fabrication of VOx films for energy and electronic device applications.

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Phase field modeling of V2O5 hot corrosion kinetics in thermal barrier coatings

Cited by 58 publications

References 33 publications

A phase field method for modeling anodic dissolution induced stress corrosion crack propagation

A phase field method for modeling anodic dissolution induced stress corrosion crack propagation

Modeling of inter- and transgranular stress corrosion crack propagation in polycrystalline material by using phase field method

Degradation Mechanism of Vanadium Oxide Films When Grown on Y‐Stabilized ZrO₂ Above 500 °C

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Phase field modeling of V2O5 hot corrosion kinetics in thermal barrier coatings

Cited by 58 publications

References 33 publications

A phase field method for modeling anodic dissolution induced stress corrosion crack propagation

A phase field method for modeling anodic dissolution induced stress corrosion crack propagation

Modeling of inter- and transgranular stress corrosion crack propagation in polycrystalline material by using phase field method

Degradation Mechanism of Vanadium Oxide Films When Grown on Y‐Stabilized ZrO2 Above 500 °C

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Degradation Mechanism of Vanadium Oxide Films When Grown on Y‐Stabilized ZrO₂ Above 500 °C