Spinodal decomposition and the pseudo-binary decomposition in high-entropy alloys

Luan, Hengwei; Huang, Liufei; Kang, Jingyi; Luo, Bosang; Yang, Xinglong; Li, Jinfeng; Han, Zhidong; Si, Jiajia; Shao, Yang; Lü, Jian; Yao, Kefu

doi:10.1016/j.actamat.2023.118775

Cited by 32 publications

(5 citation statements)

References 71 publications

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“…This observation is expected as HEAs possess a complex compositional space and are presumably stabilized by the effects of high entropy . Consequently, HEAs are inherently metastable and more prone to undergoing spinodal decomposition at low temperatures …”

Section: Bulk Nanostructured Heasmentioning

confidence: 99%

“…64 Consequently, HEAs are inherently metastable 195 and more prone to undergoing spinodal decomposition at low temperatures. 19 The decomposed phases resulting from spinodal decomposition typically exhibit interconnected structures at the nanoscale, forming a maze-like or sponge-like morphology. These widespread biphasic nanostructures are believed to significantly enhance the mechanical performance of materials.…”

Section: Bulk Nanostructured Heasmentioning

confidence: 99%

“…18 Luan et al proposed a criterion for spinodal decomposition and demonstrated that increasing the number of elements in HEAs enhances the likelihood of spinodal decomposition. 19 Furthermore, Li et al employed scanning transmission electron microscope (STEM) to uncover a twostage nanoprecipitation process involving initial chemical phase separation followed by subsequent structural ordering. 20 However, in certain cases, the kinetics of coarsening during either quenching or annealing treatments can result in the growth of nanostructures into microscale and even larger-scale structures, within a relatively short period of time.…”

Section: Intrinsic Versus Extrinsic Factors For Nanostructure Formationmentioning

confidence: 99%

“…One example is the formation of a spinodal nanostructure, which occurs due to phase instability at a critical temperature, causing the system to deviate from a random solid solution state . Luan et al proposed a criterion for spinodal decomposition and demonstrated that increasing the number of elements in HEAs enhances the likelihood of spinodal decomposition . Furthermore, Li et al employed scanning transmission electron microscope (STEM) to uncover a two-stage nanoprecipitation process involving initial chemical phase separation followed by subsequent structural ordering .…”

Section: Intrinsic Versus Extrinsic Factors For Nanostructure Formationmentioning

confidence: 99%

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Nanostructured High Entropy Alloys as Structural and Functional Materials

Zhu,

Gao,

Yao

et al. 2024

ACS Nano

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Since their introduction in 2004, high entropy alloys (HEAs) have attracted significant attention due to their exceptional mechanical and functional properties. Advances in our understanding of atomic-scale ordering and phase formation in HEAs have facilitated the development of fabrication techniques for synthesizing nanostructured HEAs. These materials hold immense potential for applications in various fields including automobile industries, aerospace engineering, microelectronics, and clean energy, where they serve as either structural or functional materials. In this comprehensive Review, we conduct an in-depth analysis of the mechanical and functional properties of nanostructured HEAs, with a particular emphasis on the roles of different nanostructures in modulating these properties. To begin, we explore the intrinsic and extrinsic factors that influence the formation and stability of nanostructures in HEAs. Subsequently, we delve into an examination of the mechanical and electrocatalytic properties exhibited by bulk or three-dimensional (3D) nanostructured HEAs, as well as nanosized HEAs in the form of zero-dimensional (0D) nanoparticles, one-dimensional (1D) nanowires, or two-dimensional (2D) nanosheets. Finally, we present an outlook on the current research landscape, highlighting the challenges and opportunities associated with nanostructure design and the understanding of structure−property relationships in nanostructured HEAs.

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Section: Bulk Nanostructured Heasmentioning

confidence: 99%

Section: Bulk Nanostructured Heasmentioning

confidence: 99%

Section: Intrinsic Versus Extrinsic Factors For Nanostructure Formationmentioning

confidence: 99%

Section: Intrinsic Versus Extrinsic Factors For Nanostructure Formationmentioning

confidence: 99%

See 2 more Smart Citations

Nanostructured High Entropy Alloys as Structural and Functional Materials

Zhu,

Gao,

Yao

et al. 2024

ACS Nano

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show abstract

“…37 Previous studies have also shown that many highentropy alloys do not actually possess a stable single-phase structure, but instead tend to form mixed phases through spinodal decomposition or the precipitation of second phases. [38][39][40] It is crucial to explore novel approaches to stabilize the highentropy single-phase structure for high-performance thermoelectrics.…”

Section: Introductionmentioning

confidence: 99%

Adaptable sublattice stabilized high-entropy materials with superior thermoelectric performance

Gao,

Zhao,

Wuliji

et al. 2023

Energy Environ. Sci.

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Thermodynamic Descriptors for Rapid Search of Compositional Complex Spinodal Alloys with Artificial Neural Network

Gong,

Chen,

Shang

et al. 2024

High Entropy Alloys & Materials

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Designing compositional complex alloys with interconnected nanostructures through spinodal decomposition is promising for achieving advanced alloys with exceptional mechanical and functional properties. However, the lack of equilibrium phase diagrams for such compositional complex alloys has posed a significant challenge. In this study, we address this challenge by first introducing data descriptors derived from instability of solid solutions with ideal mixing and later serving as the basis for developing an artificial neural network (ANN) with other commonly used data descriptors. Using this ANN model, we have successfully designed a series of compositional complex spinodal alloys (CCSAs) within the Al–Co–Cr–Fe–Ni and Al–Cu–Fe–Mn–Ni system. Furthermore, we extended the ideal mixing model of solid solution instability by considering chemical short-range ordering and elemental de-mixing, which better explains the elemental separation of CCSAs.

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Spinodal decomposition and the pseudo-binary decomposition in high-entropy alloys

Cited by 32 publications

References 71 publications

Nanostructured High Entropy Alloys as Structural and Functional Materials

Nanostructured High Entropy Alloys as Structural and Functional Materials

Adaptable sublattice stabilized high-entropy materials with superior thermoelectric performance

Thermodynamic Descriptors for Rapid Search of Compositional Complex Spinodal Alloys with Artificial Neural Network

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