Simulation of neck growth and shrinkage for realistic temperature profiles – Determination of diffusion coefficients in a practical oriented procedure

Thomsen, Fritz; Ebel, Thomas; Willumeit‐Römer, Regine

doi:10.1016/j.scriptamat.2019.04.034

Cited by 7 publications

(12 citation statements)

References 7 publications

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“…The underlying 7DOF model, thanks to its simplicity, can be relatively easy calibrated to fit the existing experimental data if some diffusion properties of a given material are absent, as described in [42] and later demonstrated in [44]. The obtained coefficients can be directly used in the proposed formulation without any further modification and rescaling.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…The sintering force is introduced with the aid of the 7DOF model developed by Thomsen et al [42,44]. A short summary is provided herein and the reader is referred to the aforementioned works for more details.…”

Section: Dof Particles Sintering Modelmentioning

confidence: 99%

“…The isotropic shrinkage observable macroscopically during sintering implicitly introduces the homogeneity of densification inside a sinter body provided the contact pairs are randomly oriented. This means that for assemblies containing a large number of particles, quantity (44) should have Gaussian distribution.…”

Section: Correction Of the Inter-particles Shrinkagementioning

confidence: 99%

“…As a second benchmark, numerical simulations reproducing the experimental data of Thomsen et al [44,65] for pure titanium are performed with the proposed technique. The samples are sintered using different heating profiles summarized in Table 3.…”

Section: Numerical Simulations Of Titanium Sinteringmentioning

confidence: 99%

“…Since third-party data may contain hard to track errors and be subject to certain limitations not always explicitly disclosed in the papers, it is desirable (but not always possible) to operate with personal highly reliable experimental results. Taking advantage of having excellent research facilities at our center, the titanium benchmark uses the experimental data obtained previously [44] by our group for which all the conditions and possible limitations are known. Finally, Sect.…”

Section: Introductionmentioning

confidence: 99%

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Coupling the discrete element method and solid state diffusion equations for modeling of metallic powders sintering

et al. 2022

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A novel discrete element method-based approach for modeling of solid state sintering of spherical metallic powder is presented. It tackles the interplay between the thermodynamical mass transport effects arising in the vicinity of the grain boundary between the particles and their mechanical interaction. To deal with the former, an elementary model is used that describes the behavior of the matter flow at the grain boundary such that neck growth and shrinkage are properly captured. The model solves a set of partial differential equations which drive the changes of the corresponding geometry parameters. Their evolution is transformed into the equivalent normal sintering force arising in each sinter neck. To capture the mechanical interaction of particles due to their rearrangement resulting from the geometry changes of each individual contact, the entire assembly is modeled as an assembly of 2-nodal structural elements with 6 degrees of freedom per node. The stiffness properties are estimated employing the approximations from the bonded DEM. The numerical implementation then constitutes a two-step staggered solution scheme, where these models are applied sequentially. The performed benchmarks reveal the plausibility of the proposed approach and exhibit good agreement of both neck growth and shrinkage rates obtained in the numerical simulations with the experimental data.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Dof Particles Sintering Modelmentioning

confidence: 99%

Section: Correction Of the Inter-particles Shrinkagementioning

confidence: 99%

Section: Numerical Simulations Of Titanium Sinteringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coupling the discrete element method and solid state diffusion equations for modeling of metallic powders sintering

et al. 2022

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Role of temperature in tribolayers in fretting wear of γ-TiAl alloy

Yang,

Shang,

Pei

et al. 2024

Friction

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The formation of tribolayers may play significant influences on fretting wear. At elevated temperature, the adhesion among wear debris and the increased diffusion rate facilitate the formation of tribolayers. However, the intensification of oxidation at elevated temperature and the low diffusion rate in oxides may play an adverse role. The present study aims to investigate the role of temperature in tribolayers in fretting wear using a γ-TiAl alloy. Scanning electron microscope, energy dispersive spectrometer, Raman spectrometer, transmission electron microscope and nanoindentation were utilized to investigate the wear debris, tribolayers, and wear scars. The fretting tests showed that, compared with that at room temperature (RT) and 350 °C, significant reduction in wear rate and decrease in the fluctuation of friction coefficient occurred at 550 and 750 °C. It was further revealed that when temperature raised from room temperature (RT) to 750 °C, the oxidation of the wear debris increased slightly and the diffusion coefficients increased prominently, which facilities the formation of well tribo-sintered tribolayers. The well tribo-sintered tribolayers presented homogenous structure, nanocrystalline grains with excellent mechanical properties, and resulted in the improvement in the fretting wear resistance of the γ-TiAl alloy at 550 and 750 °C.

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A free-energy-based and interfacially consistent phase-field model for solid-state sintering without artificial void generation

Yang

Gao

Kirshtein

et al. 2023

Computational Materials Science

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Simulation of neck growth and shrinkage for realistic temperature profiles – Determination of diffusion coefficients in a practical oriented procedure

Cited by 7 publications

References 7 publications

Coupling the discrete element method and solid state diffusion equations for modeling of metallic powders sintering

Coupling the discrete element method and solid state diffusion equations for modeling of metallic powders sintering

Role of temperature in tribolayers in fretting wear of γ-TiAl alloy

A free-energy-based and interfacially consistent phase-field model for solid-state sintering without artificial void generation

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