Multi-scale modeling of shape distortions during sintering of bi-layers

Molla, Tesfaye Tadesse; Bjørk, Rasmus; Olevsky, Eugene A.; Pryds, Nini; Frandsen, Henrik Lund

doi:10.1016/j.commatsci.2014.02.041

Cited by 28 publications

(30 citation statements)

References 36 publications

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“…While early work was often restricted to computing individual stages of sintering in 2D models, [1][2][3] a broad range of approaches has been published in the meantime, covering 3D [4,5] and multiscale [6,7] simulations for all types of sinter processes. [9] The kMC models were successfully used to capture important features in the sintering process such as curvature driven grain growth and pore migration, [8] influence of particle size distribution, [10] or to predict the densification kinetics in terms of shrinkage strains. [9] The kMC models were successfully used to capture important features in the sintering process such as curvature driven grain growth and pore migration, [8] influence of particle size distribution, [10] or to predict the densification kinetics in terms of shrinkage strains.…”

Section: Introductionmentioning

confidence: 99%

Modeling Inherently Homogeneous Sintering Processes

Raether¹,

Seifert²

2018

Advcd Theory and Sims

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A novel Monte Carlo model for the simulation of sintering processes is introduced. Different from previous models, local interface curvature is considered in the acceptance of diffusion steps. This enables the investigation of the effects of interface energies on the sintering process. Sintering paths are calculated for various microstructures and interface energies. Results are interpreted in the framework of thermodynamic criteria for homogeneous sintering processes which were presented recently.Using Eq. (3), the grain boundary to surface energy ratio can be determined from the dihedral angle alone. [15] The surface energy

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Section: Introductionmentioning

confidence: 99%

Modeling Inherently Homogeneous Sintering Processes

Raether¹,

Seifert²

2018

Advcd Theory and Sims

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“…The shear and bulk viscosity, as well as dynamic viscosity, describe the rheological response of ceramic body during liquid phase sintering process. They are responsible for the resistance of ceramic body against pyroplastic deformation and shrinkage during liquid phase sintering . These temperature dependent parameters are influenced by the evolving density, liquid content, wetting, and contiguity during the sintering process.…”

Section: Introductionmentioning

confidence: 99%

“…Not only did distortion, deflection, cracks occur but also nonuniform shrinkage took place in the sintered bodies . This loss of a product final shape can be defined as the pyroplastic deformation which takes place more frequently in highly vitrified ceramic bodies such as porcelains …”

Section: Introductionmentioning

confidence: 99%

“…There are considerable conceptual and experimental difficulties to determine the rheological parameters in ceramic materials during the liquid phase sintering process. These experimental procedure including the midpoint deflection test, sinter bending test, dilatometry, and quantitative microscopy of fired samples microstructure provide the means to characterize the rheological response during liquid phase sintering process . It has been proposed that through the measurement of bending deformation test, the system viscosity can be calculated by the steady‐state creep equation.…”

Section: Introductionmentioning

confidence: 99%

“…An alternative to overcome the experimental problems as well as the inherent unpredictable pyroplastic deformation is finite element method (FEM). With this goal, constitutive models have to be developed, taking into account the different deformation factors such as anisotropic shrinkage, gravity, and friction influences …”

Section: Introductionmentioning

confidence: 99%

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Evaluation of dynamic viscosity and rheological properties of ceramic materials during liquid phase sintering by numerical‐experimental procedure

Nasrabadi

Salahi

Asil

2017

Int J Applied Ceramic Tech

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The effective shear and bulk viscosity, as well as dynamic viscosity, describe the rheological properties of the ceramic body during the liquid phase sintering process. The rheological parameters depend on the physical and thermo‐mechanical characteristics of the material such as relative density, temperature, grain size, diffusion coefficient, and activation energy. In this paper, the numerical‐experimental method has been developed to study both viscous and rheological behavior of hard porcelain ceramic body during liquid phase sintering. The other aim is to acquire a complete understanding of the response of an incompressible viscose material during sintering such as stress‐strain relations, sintering, and hydrostatic stress. Densification results confirmed that the bulk viscosity was well‐defined with relative density. The stress analysis proved that the sintering stress is more than the hydrostatic stress during the entire sintering time so, the sintering process occurs completely. Deflection results showed that the shear viscosity was a fair estimation of real ones. Dilatometry, SEM, XRD investigations as well as bulk viscosity simulation results confirmed that the “mullitisation plateau” was presented as a very little extraordinary expansion at the final sintering stage.

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Micropore Evolution and Damage Behavior of Rapid‐Solidified Al–Zn–Mg–Cu Alloy during Hot Plastic Forming

et al. 2023

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Rapid‐solidified Al–Zn–Mg–Cu alloys possess widespread application prospects owing to their excellent properties, particularly high specific strength. Nevertheless, their further development for use as advanced structural parts is significantly limited by their intrinsic porosity. Herein, the flow stress subroutine and micropore evolution model are combined to predict the cracking and damage behavior of a rapidly solidified Al–Zn–Mg–Cu disk‐shaped part during hot forging. The results reveal that the damage to the part during plastic forming is inversely proportional to the relative density. Reasonable matching between the height‐to‐diameter ratio (H/D) and the initial relative density is the key factor in avoiding cracking and damage to the part. The closure sequence of the micropores is from the center to the outside of the billet. A billet with an H/D of 1 and initial relative density of 0.95 can reach full density after forming, and a damage‐free part can be obtained. These simulation results are verified by analyzing the microstructural characteristics and mechanical properties of the actual forged part.

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Multi-scale modeling of shape distortions during sintering of bi-layers

Cited by 28 publications

References 36 publications

Modeling Inherently Homogeneous Sintering Processes

Modeling Inherently Homogeneous Sintering Processes

Evaluation of dynamic viscosity and rheological properties of ceramic materials during liquid phase sintering by numerical‐experimental procedure

Micropore Evolution and Damage Behavior of Rapid‐Solidified Al–Zn–Mg–Cu Alloy during Hot Plastic Forming

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