Interdiffusion along grain boundaries – Diffusion induced grain boundary migration, low temperature homogenization and reactions in nanostructured thin films

Beke, Dezső L.; Kaganovskii, Yuri; Katona, G.L.

doi:10.1016/j.pmatsci.2018.07.001

Cited by 41 publications

(20 citation statements)

References 152 publications

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“…As shown in Figure 5, a GB segment has migrated ∼ 110 nm from its initial position and formed a Cr-enriched region with a peak concentration of ∼ 5.8 at.%. Some moiré fringes and lattice distortions, possibly related to diffusion-induced stresses (or strains) which dominantly contribute to DIGM [27], can be observed in this region. It is noted that the local stresses are also possibly due to unrelaxed ones induced by SMRT.…”

Section: Resultsmentioning

confidence: 92%

“…At low temperatures when lattice diffusion was very small or completely frozen out but GB diffusion was remarkable, a distinct transverse shift of GBs, i.e. diffusion-induced GB migration (DIGM), occurred in some metallic systems [25][26][27]. During DIGM, the GB migrates towards the adjacent grains, and the solute atoms initially diffused into the GB will be left behind the newly-formed parts of the growing grains.…”

Section: Resultsmentioning

confidence: 99%

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Accelerated grain boundary migration in nanolaminated interstitial-free steel during chromizing

Xie

Divinski

Lei

et al. 2020

Materials Research Letters

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A nanolaminated surface layer was produced on interstitial-free steel by surface mechanical rolling treatment. While the microstructure showed relatively high thermal stability during annealing at 500°C, significant grain boundary (GB) migration occurred in the nanolaminated surface layer during chromizing at the same temperature. GB diffusion of Cr was observed under the Harrison B-type regime in the chromized surface layer. The accelerated GB migration was discussed to be influenced by enhanced GB energy and mobility due to the GB diffusion and enrichment of Cr in nanolaminated structures. Meanwhile, the high stresses introduced during sample preparations also enhance the coarsening kinetics. IMPACT STATEMENT Different from enhanced thermal stability by regular GB segregation, GB enrichment of Cr due to fast GB diffusion from a Cr-coating can accelerate the GB migration in nanolaminated IF steel.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Accelerated grain boundary migration in nanolaminated interstitial-free steel during chromizing

Xie

Divinski

Lei

et al. 2020

Materials Research Letters

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“…The introduction of a liquid phase into the material creates new solid−liquid interfaces at the grain boundaries, which impedes the interface movement and increases the diffusion distance. 50,51 In Figure 3c, a large ratio of small-angle grain boundaries was detected together with a small portion of twin boundaries (60°m isorientation angle). Small-angle grain boundaries serve as phonon scattering centers, leading to reduced lattice thermal conductivity and an insignificant influence on electron transport because of their lower boundary energies.…”

Section: Resultsmentioning

confidence: 96%

Enhancing Thermoelectric Properties of Bi₂Te₃-Based Pellets through Low-Temperature Liquid Phase Sintering and Heat Treatment

Liu,

Zheng,

Cai

et al. 2023

ACS Appl. Energy Mater.

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Low-temperature liquid phase sintering (LPS) has proven to be cost effective in preparing Bi 2 Te 3 -based pellets with promising thermoelectric properties. The previous work explored deionized water as the transient liquid phase with a low boiling point (100 °C), making it challenging to produce densified pellets at high temperatures. In this work, we opted for an ethylene glycol (EG) solution with a higher boiling point (∼200 °C) as the liquid phase. The EG solution serves as a suitable alternative and enhances the electrical conductivity and power factor of n-type Bi 2 Te 2.7 Se 0.3 (BTS) materials. Moreover, the BTS samples were heat treated to assess the effectiveness in increasing the ZT value. The BTS samples subjected to LPS with 3% EG addition and followed by a heat treatment at 300 °C exhibited a power factor of 1056 μW/mK 2 . A lattice thermal conductivity of 0.69 W/mK was achieved at room temperature, originating from enhanced phonon scattering by enriched grain boundaries and other crystal defects. These samples demonstrate a maximum ZT value of 0.43 at 381 K, ∼72% improvement over the deionized water-treated samples (ZT max = 0.25). The findings highlight the significance of liquid phase selection and heat treatment in optimizing the thermoelectric properties of the BTS materials.

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“…In that case, more mass is transferred over GB than through grains, and around the grains the concentration is enlarged. More atoms are penetrating into the grain, which is why, further in, the crystal concentration gradient is larger compared to the first layers of the polycrystal [14,19,23,37]. For better understanding how GB diffusion affects the overall diffusion process, a quantitative analysis was done.…”

Section: Resultsmentioning

confidence: 99%

Kinetic Modeling of Grain Boundary Diffusion: The Influence of Grain Size and Surface Processes

Jaseliūnaitė

Galdikas

2020

Materials

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Based on rate equations, the kinetics of atom adsorption, desorption, and diffusion in polycrystalline materials is analyzed in order to understand the influence of grain boundaries and grain size. The boundary conditions of the proposed model correspond with the real situation in the electrolytes of solid oxide hydrogen fuel cells (SOFC). The role of the ratio of grain boundary and grain diffusion coefficients in perpendicular and parallel (to the surface) concentration profiles is investigated. In order to show the influence of absolute values of grain and grain boundary diffusion coefficients, we select four different cases in which one of the diffusion coefficients is kept constant while the others vary. The influence of grain size on diffusion processes is investigated using different geometrical models. The impact of kinetic processes taking place on the surface is analyzed by comparing results obtained assuming the first layer as a constant source and then involving in the model the processes of adsorption and desorption. It is shown that surface processes have a significant influence on the depth distribution of diffusing atoms and cannot be ignored. The analytical function of overall concentration dependence on grain and grain boundary volume ratio (Vg/Vgb) is found. The solution suggests that the concentration increases as a complementary error function while Vg/Vgb decreases.

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Interdiffusion along grain boundaries – Diffusion induced grain boundary migration, low temperature homogenization and reactions in nanostructured thin films

Cited by 41 publications

References 152 publications

Accelerated grain boundary migration in nanolaminated interstitial-free steel during chromizing

Accelerated grain boundary migration in nanolaminated interstitial-free steel during chromizing

Enhancing Thermoelectric Properties of Bi₂Te₃-Based Pellets through Low-Temperature Liquid Phase Sintering and Heat Treatment

Kinetic Modeling of Grain Boundary Diffusion: The Influence of Grain Size and Surface Processes

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Interdiffusion along grain boundaries – Diffusion induced grain boundary migration, low temperature homogenization and reactions in nanostructured thin films

Cited by 41 publications

References 152 publications

Accelerated grain boundary migration in nanolaminated interstitial-free steel during chromizing

Accelerated grain boundary migration in nanolaminated interstitial-free steel during chromizing

Enhancing Thermoelectric Properties of Bi2Te3-Based Pellets through Low-Temperature Liquid Phase Sintering and Heat Treatment

Kinetic Modeling of Grain Boundary Diffusion: The Influence of Grain Size and Surface Processes

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Product

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Enhancing Thermoelectric Properties of Bi₂Te₃-Based Pellets through Low-Temperature Liquid Phase Sintering and Heat Treatment