Assessment of substitutional self-diffusion along short-circuit paths in Al, Fe and Ni

Stechauner, Georg; Kozeschnik, Ernst

doi:10.1016/j.calphad.2014.06.008

Cited by 41 publications

(22 citation statements)

References 38 publications

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“…[85] Additionally, the values of the volume diffusion coefficient D v as a function of the sintering temperature were taken from Reference 86 and are given in Table IV. In Table IV, the dislocation pipe diffusion coefficient D p values, obtained from Stechauner and Kozeschnik, [87] based on an Arrhenius-type relation, D p = D 0 exp(À Q/RT), with activation energy Q (kJ/mol) and pre-exponential factor D 0 (m 2 /s) changing for the different iron phases, are reported. The calculated pipe diffusivity values are comparable with the experimental results measured by Shima et al [66] at all temperatures, with the only exception of the austenitic field, for which, to the best of our knowledge, data are not available in the literature.…”

Section: E Model Validationmentioning

confidence: 99%

“…In light of this finding, the literature data that had been previously utilized were re-examined. In the work of Stechauner and Kozeschnik, [87] there are no experimental data available for temperatures above about 650°C. They propose an extension of the curve until above 1400°C, most likely in analogy with the grain boundary diffusivity data provided in the same plot, on which the data given in Table IV are based.…”

Section: E Model Validationmentioning

confidence: 99%

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Anisotropy of Mass Transfer During Sintering of Powder Materials with Pore–Particle Structure Orientation

Torresani

Giuntini

Zhu

et al. 2018

Metall Mater Trans A

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A micromechanical model for the shrinkage anisotropy during sintering of metallic powders is proposed and experimentally assessed. The framework developed for modeling sintering based on the mechanism of grain boundary diffusion is extended to take into account the dislocation pipe-enhanced volume diffusion. The studied iron powder samples are pre-shaped into their green forms by uniaxial cold pressing before sintering step. The resultant green bodies are anisotropic porous structures, with inhomogeneous plastic deformation at the inter-particle contacts. These non-uniformities are considered to be the cause of the anisotropic dislocation pipe diffusion mechanisms, and thus of the undesired shape distortion during shrinkage. The proposed model describes the shrinkage rates in the compaction loading and transverse directions, as functions of both structural and geometric activities of the samples. Dislocation densities can be estimated from such equations using dilatometry and image analysis data. The reliability and applicability of the developed modeling framework are verified by comparing the calculated dislocation densities with outcomes of nanoindentation and electron backscatter diffraction-derived lattice rotations.

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Section: E Model Validationmentioning

confidence: 99%

Section: E Model Validationmentioning

confidence: 99%

Anisotropy of Mass Transfer During Sintering of Powder Materials with Pore–Particle Structure Orientation

Torresani

Giuntini

Zhu

et al. 2018

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…The latter is adopted from a recent independent assessment of Stechauner and Kozeschnik, [30] providing the essential information on the temperature dependence of the free mobility, which thus becomes a fixed quantity in our treatment instead of being an unknown fitting parameter. The absolute value of this quantity is adjusted such that it is in accordance to the mobility suggestion for low-alloyed austenite reported in Reference 31.…”

Section: Model Parametersmentioning

confidence: 99%

A Model for Static Recrystallization with Simultaneous Precipitation and Solute Drag

Buken

Kozeschnik

2016

Metall Mater Trans A

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In the present work, we introduce a state parameter-based microstructure evolution model, which incorporates the effect of solute atoms and precipitates on recrystallization kinetics. The model accounts for local precipitate coarsening at grain boundaries, which promotes an average grain boundary movement even if the Zener pinning force exceeds the driving force for recrystallization. The impact of solute drag on the grain boundary mobility as well as simultaneous precipitation is discussed in detail. The model is validated on experimental data on recrystallization in V-micro-alloyed steel, where excellent agreement is achieved.

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“…Sun et al propose that the Mn diffusivity in the present family of alloys is lower compared to low‐Si alloys due to attractive chemical interaction between Si and Mn. In line with this suggestion, the diffusion coefficient of Mn used in the present simulations is taken one order of magnitude lower compared to the value determined in ref . The interface energy reduction between MnS and matrix due to interface dilution is accounted for in the sense of the model developed in ref .…”

Section: Chemical Composition Of the Investigated Alloysmentioning

confidence: 56%

“…In line with this suggestion, the diffusion coefficient of Mn used in the present simulations is taken one order of magnitude lower compared to the value determined in ref. [28] The interface energy reduction between MnS and matrix due to interface dilution is accounted for in the sense of the model developed in ref. [20] with a regular solution critical temperature of 2400 K. The substructure evolution is modeled within the framework of the Sherstnev-Lang-Kozeschnik -ABC model.…”

mentioning

confidence: 99%

Kinetics Simulation of MnS Precipitation in Electrical Steel

Lückl

Zamberger

Kozeschnik

2015

steel research int.

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In this work, the solid-state precipitation kinetics of manganese sulfides (MnS) particles in ferrite during continuous deformation of electrical steel is investigated. Thermokinetic simulations are carried out on basis of the software package MatCalc. The results are compared with independent experimental results from literature. The mean radius evolution of second phase MnS precipitates is numerically simulated as a function of the heat treatment parameters time and temperature. The calculated results show good agreement with the experimental measurements using a single set of simulation input parameters.

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Assessment of substitutional self-diffusion along short-circuit paths in Al, Fe and Ni

Cited by 41 publications

References 38 publications

Anisotropy of Mass Transfer During Sintering of Powder Materials with Pore–Particle Structure Orientation

Anisotropy of Mass Transfer During Sintering of Powder Materials with Pore–Particle Structure Orientation

A Model for Static Recrystallization with Simultaneous Precipitation and Solute Drag

Kinetics Simulation of MnS Precipitation in Electrical Steel

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