Understanding of the Elemental Diffusion Behavior in Concentrated Solid Solution Alloys

Zhang, Chuan; Zhao, Fan; Jin, Ke; Bei, Hongbin; Chen, Shuanglin; Cao, Wei; Zhu, Jun; Lv, Duchao

doi:10.1007/s11669-017-0580-5

Cited by 75 publications

(34 citation statements)

References 26 publications

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“…What is more, Miracle and Senkov [4] pointed out that even the normalized values obtained by Tsai et al could hardly be considered abnormal, as they are well within the range for the other FCC metals and alloys at the melting point. This was further studied by Zhang et al [34] and has been discussed later on. The study of Tsai et al [28], while certainly, pioneering has been widely discussed, is being controversial in some of the aspects.…”

Section: Solute Systemmentioning

confidence: 88%

State-of-the-Art Diffusion Studies in the High Entropy Alloys

Dąbrowa

Danielewski

2020

Metals

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The development of the high entropy alloys (HEAs) is amongst the most important topics in the field of materials science during the last two decades. The concept of multicomponent, near-equimolar systems has been already applied to the number of other systems, including oxides, carbides, diborides, silicides, and it can be expected that other groups of materials will follow. One of the main driving forces for the development of HEAs is the so-called “four core effects”: high entropy effects, severe lattice distortion, cocktail effect, and sluggish diffusion effect. Their existence and extent has been a subject of heated discussion. Probably the least studied of them is the sluggish diffusion effect, which is of the, especially, high importance from the point of view of the most possible applications of HEAs—as high-temperature materials. Its alleged existence carries a promise of obtaining materials with superior mechanical properties, higher creep resistance, and less susceptibility to high-temperature corrosion. In the current review, the state-of-the-art of diffusion studies in HEAs was presented, as well as the resulting conclusions concerning the existence of the sluggish diffusion effect. Based on the literature analysis, it can be stated that there is no experimental evidence, which would support the existence of the sluggish diffusion in HEAs on the level of tracer and self-diffusivities. Nevertheless, it can be pointed out that our current state of knowledge on the diffusion in HEAs is still far from complete; therefore, further directions of studies are proposed.

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Section: Solute Systemmentioning

confidence: 88%

State-of-the-Art Diffusion Studies in the High Entropy Alloys

Dąbrowa

Danielewski

2020

Metals

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“…Such a multicomponent alloy is a vast challenge for the computational modeling [50]. However, with the research and interest in the field of HEAs, and the gigantic development of material computation, there are many calculations and predictions to study the structures, properties, dynamics, and thermodynamics of HEAs [119][120][121][122][123].…”

Section: Heas and "Materials Genome Initiative"mentioning

confidence: 99%

Science and technology in high-entropy alloys

2018

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As human improve their ability to fabricate materials, alloys have evolved from simple to complex compositions, accordingly improving functions and performances, promoting the advancements of human civilization. In recent years, high-entropy alloys (HEAs) have attracted tremendous attention in various fields. With multiple principal components, they inherently possess unique microstructures and many impressive properties, such as high strength and hardness, excellent corrosion resistance, thermal stability, fatigue, fracture, and irradiation resistance, in terms of which they overwhelm the traditional alloys. All these properties have endowed HEAs with many promising potential applications. An in-depth understanding of the essence of HEAs is important to further developing numerous HEAs with better properties and performance in the future. In this paper, we review the recent development of HEAs, and summarize their preparation methods, composition design, phase formation and microstructures, various properties, and modeling and simulation calculations. In addition, the future trends and prospects of HEAs are put forward.

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“…Alloys with multiple principal elements have larger fluctuations in LPE than traditional alloys, providing many low‐LPE sites that hinder atomic diffusion. On the other hand, other negative conclusions in recent articles in FCC HEAs make the sluggish diffusion phenomenon very controversial . The five number of principal atoms do not guarantee an extra slugging effect, but a specific element possibly produces a deep potential wall, like Mn in CoCrFeMnNi alloy.…”

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confidence: 98%

Beating Thermal Coarsening in Nanoporous Materials via High‐Entropy Design

et al. 2019

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produced by dealloying have outstanding physical properties due to their unique structure with open porous networks, [3][4][5] the undesirable coarsening phenomenon leads to degradation of physical properties over time, even at room temperature. [6][7][8] The originally proposed idea behind high-entropy alloy (HEA) with multiprinciple elements is maximizing the configuration entropy to stabilize a solid-solution alloy without undesired ordered intermetallics. [9][10][11] Many studies have suggested that HEAs uniquely possesses combined desirable properties such as a high strength and ductility paired with high fracture toughness, [12][13][14] fatigue resistance, [15] and creep resistance. [16] HEAs also show promising properties in harsh environments resisting corrosion, [17][18][19] and irradiation [20] attacks. Atomic size differences between constituting elements in HEA increase the activation energy for grain growth, and sluggish diffusion kinetics has considered as the main reason for the exceptional high strength and structural stability of HEAs at high temperatures. [21,22] The rationale behind it, the multiprinciple elements cause larger fluctuations in lattice potential energy (LPE), providing many low-LPE sites that hinder atomic diffusion. [23] Grain growth and ligament coarsening rely on the same physical background of surface diffusion. In that context, the high-entropy design in nanoporous materials has a potential for achieving an exceptional stability against the coarsening.Controlling the feature sizes of 3D bicontinuous nanoporous (3DNP) materials is essential for their advanced applications in catalysis, sensing, energy systems, etc., requiring high specific surface area. However, the intrinsic coarsening of nanoporous materials naturally reduces their surface energy leading to the deterioration of physical properties over time, even at ambient temperatures. A novel 3DNP material beating the universal relationship of thermal coarsening is reported via high-entropy alloy (HEA) design. In newly developed TiVNbMoTa 3DNP HEAs, the nanoporous structure is constructed by very fine nanoscale ligaments of a solid-solution phase due to enhanced phase stability by maximizing the configuration entropy and suppressed surface diffusion. The smallest size of 3DNP HEA synthesized at 873 K is about 10 nm, which is one order of magnitude smaller than that of conventional porous materials. More importantly, the yield strength of ligament in 3DNP HEA approaches its theoretical strength of G/2π of the corresponding HEA alloy even after thermal exposure. This finding signifies the key benefit of high-entropy design in nanoporous materials-exceptional stability of size-related physical properties. This high-entropy strategy should thus open new opportunities for developing ultrastable nanomaterials against its environment.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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Understanding of the Elemental Diffusion Behavior in Concentrated Solid Solution Alloys

Cited by 75 publications

References 26 publications

State-of-the-Art Diffusion Studies in the High Entropy Alloys

State-of-the-Art Diffusion Studies in the High Entropy Alloys

Science and technology in high-entropy alloys

Beating Thermal Coarsening in Nanoporous Materials via High‐Entropy Design

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