Grain growth and second-phase precipitation in nanocrystalline aluminum–manganese electrodeposits

Huang, Ting-Yun; Kalidindi, Arvind R.; Schuh, Christopher A.

doi:10.1007/s10853-017-1764-4

Cited by 11 publications

(5 citation statements)

References 50 publications

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“…Nanocrystalline materials have the high‐density GBs and triple junctions, 19,88,89 which provide massive sites for precipitation of solute‐rich phase. Especially at high temperatures or the high solute concentration, the segregated solute atoms may easily form the solute‐rich particles, causing the reduction of GB excess of solute atoms and the decrease of the GB energy and solute drag effects, which, in turn, may lead to the acceleration of grain coarsening 40,41,90 . For example, Gupta et al 41 studied the grain growth behavior of Fe‐10 at.% Cr alloy at three different temperature of 773, 873, and 973 K, as shown in Figure 6.…”

Section: Thermo‐kinetic Description Of Grain Growth Processmentioning

confidence: 99%

“…Especially at high temperatures or the high solute concentration, the segregated solute atoms may easily form the solute-rich particles, causing the reduction of GB excess of solute atoms and the decrease of the GB energy and solute drag effects, which, in turn, may lead to the acceleration of grain coarsening. 40,41,90 For example, Gupta et al 41 studied the grain growth behavior of Fe-10 at.% Cr alloy at three different temperature of 773, 873, and 973 K, as shown in Figure 6. At the low temperatures of 773 K, the grain size increases with an increase in annealing time and finally reaches the saturation value.…”

Section: Experiments and Simulationsmentioning

confidence: 99%

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Review of thermo‐kinetic correlation during grain growth in nanocrystalline materials

Peng

Jian

Liu

2020

Int J Ceramic Engine & Sci

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Nanocrystalline (NC) materials exhibit many unique properties over their coarse‐grained counterparts due to the high grain boundary density and the small grain size, but they are too difficult to be used in engineering environment because of the poor thermal stability. With regard of this, two strategies are previously proposed to enhance the thermal stability (or impede the grain growth) of NC materials, that is, the thermodynamic and the kinetic approaches. Recent investigations increasingly support that the two approaches may be physically interacted and acted on each other, and they can be treated together within a unified thermo‐kinetic framework. This paper reviews the progress in the investigation of thermo‐kinetic correlation during grain growth in NC materials. First, the theoretical models to describe the concept of the thermo‐kinetic correlation and the grain growth equations developed based on the thermo‐kinetic correlation are reviewed. Second, experimental and simulated evidences to support the coexistence of thermodynamic and kinetic effects are summarized. Third, the potential application of thermo‐kinetic correlation is analyzed and discussed. This paper shows that the stabilization of NC materials can be tailored by the selection of the suitable strategies. Finally, several directions that require further exploration are identified.

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Section: Thermo‐kinetic Description Of Grain Growth Processmentioning

confidence: 99%

Section: Experiments and Simulationsmentioning

confidence: 99%

Review of thermo‐kinetic correlation during grain growth in nanocrystalline materials

Peng

Jian

Liu

2020

Int J Ceramic Engine & Sci

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show abstract

“…On the other hand, the solute drag [12] and precipitate pinning [13] effects produce significant resistance to GB migration. Recent studies show that nanoscale precipitates can strongly inhibit GB migration and prevent further nanograin growth at elevated temperatures [14][15][16]. The inhibition from precipitates can be understood in part by several ideal models of spherical precipitates [12,13,17].…”

Section: Introductionmentioning

confidence: 99%

Grain boundary migration and deformation mechanism influenced by heterogeneous precipitate

Tan

Fang

et al. 2021

J Mater Sci

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Understanding the interaction between heterogeneous precipitates and grain boundaries (GBs) is of great significance for tailoring the stability and mechanical properties of nanograined materials. In this work, the nanoscale interaction between the cylindrical precipitate and the migrating GB is investigated by atomic simulation. The results show that the resistance for GB migration can be increased by decreasing the direction angle $$\alpha$$ α (the angle between the axis of the precipitate and the tilt axis of GB). For the larger precipitate, the influence of direction angle is more pronounced. With the increase in shear strain, the interaction between the specific precipitate and GB changes the material deformation mechanism from “GB migration” to “GB migration accompanied with activated dislocations or GB deformation,” which contributes to the softening of the material. By simultaneously tuning the direction angle and size of heterogeneous precipitates, the GB deformation can be strongly inhibited and the stability of GBs can be significantly improved.

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“…Second phase drag forces, e.g. such as exerted by Zener particle pinning can also retard grain growth of NC metals and alloys [32][33][34][35] . One or more second phases precipitated in some of the NC alloys, enabled by the increase in alloying content and extended heat treatment.…”

Section: Full Textmentioning

confidence: 99%

Stabilizing nanocrystals via higher entropy interfaces

Liu

Yuan

et al. 2022

Preprint

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Nanocrystalline (NC) metals are attractive due to their outstanding mechanical, physical and chemical properties. However, they are generally metastable and prone to undergo grain coarsening, which severely impedes their engineering application, particularly at elevated temperatures. A strategy to counteract this phenomenon lies in decreasing the energetic driving force for grain growth, through grain boundary segregation according to the Gibbs adsorption isotherm. The natural thought of ‘more segregation is better’, which was exercised over decades to solve this problem, however, does not work because interfaces themselves are thermodynamic entities, with only limited solute decoration tolerance. Herein, we propose to solve this long-standing problem via introducing multi-component co-segregated interfaces. This concept allows us to maximize the solute decoration of interfaces and minimize their energy, without triggering formation of new phases. This is enabled by extending the high entropy alloy (HEA) concept from the bulk to interfaces, a strategy we refer to as interfaces with higher entropy. This design concept is not transferred one-to-one but constrained by a few rules that reflect the nature of interfaces: use of several co-segregating elements with high mixing entropy; segregation remains in the dilute limit; and use of elements with high segregation coefficient. The latter criterion marks an important difference to the HEA concept as a high segregation coefficient guarantees that alloying elements are deposited only to those locations where they are needed, namely, to the interfaces, thus drastically reducing alloying costs. We applied this new design approach to NC-Nb and show that we can increase its stability from 873 to 1023 K with as little alloying as only 1 at.% of Ti, Ni, Co and Hf with equal fractions. The material maintains its nanocrystalline structure even after 2200 h at 973 K. This work thus offers a new paradigm for designing stable dilute NC materials for advanced engineering application.

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Grain growth and second-phase precipitation in nanocrystalline aluminum–manganese electrodeposits

Cited by 11 publications

References 50 publications

Review of thermo‐kinetic correlation during grain growth in nanocrystalline materials

Review of thermo‐kinetic correlation during grain growth in nanocrystalline materials

Grain boundary migration and deformation mechanism influenced by heterogeneous precipitate

Stabilizing nanocrystals via higher entropy interfaces

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