High-entropy intermetallics: from alloy design to structural and functional properties

Wang, Hang; He, Quanfeng; Yang, Yong

doi:10.1007/s12598-021-01926-7

Cited by 34 publications

(8 citation statements)

References 148 publications

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“…High-entropy alloys can be macroscopically defined as a novel material containing five or more dominant elemental components, of which the atomic percentage of constituent elements varying from 5% to 35%. − Due to the four-core effect, including high-entropy effect, lattice distortion effect, sluggish diffusion effect, and cocktail effect, high-entropy alloys have been widely applied in the field of biomedical materials, aerospace engineering, photothermal conversion, building materials, and magnetocaloric response, etc. − Especially, the continuous adjustment of the surface electronic structure on high-entropy alloys in nanoscale stimulates the development of heterogeneous catalysis. − High-entropy intermetallics, as a brand new concept, can integrate the advantages of high-entropy alloys and intermetallics, thus becoming an important supplement to high-entropy alloys and intermetallics and further enhancing the electrocatalytic activity and stability (Scheme a). − Although the ordered structure is an important feature of intermetallics different from disordered solid-solution alloys, the site occupancy in each sublattice of high-entropy intermetallics is still random or nearly random due to the more constituent elements than sublattices (Figure a).…”

Section: New-concept Intermetallicsmentioning

confidence: 99%

Intermetallic Nanocrystals for Fuel-Cells-Based Electrocatalysis

Lin,

Li,

Zeng

et al. 2023

Chem. Rev.

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Electrocatalysis underpins the renewable electrochemical conversions for sustainability, which further replies on metallic nanocrystals as vital electrocatalysts. Intermetallic nanocrystals have been known to show distinct properties compared to their disordered counterparts, and been long explored for functional improvements. Tremendous progresses have been made in the past few years, with notable trend of more precise engineering down to an atomic level and the investigation transferring into more practical membrane electrode assembly (MEA), which motivates this timely review. After addressing the basic thermodynamic and kinetic fundamentals, we discuss classic and latest synthetic strategies that enable not only the formation of intermetallic phase but also the rational control of other catalysis-determinant structural parameters, such as size and morphology. We also demonstrate the emerging intermetallic nanomaterials for potentially further advancement in energy electrocatalysis. Then, we discuss the state-of-the-art characterizations and representative intermetallic electrocatalysts with emphasis on oxygen reduction reaction evaluated in a MEA setup. We summarize this review by laying out existing challenges and offering perspective on future research directions toward practicing intermetallic electrocatalysts for energy conversions.

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Section: New-concept Intermetallicsmentioning

confidence: 99%

Intermetallic Nanocrystals for Fuel-Cells-Based Electrocatalysis

Lin,

Li,

Zeng

et al. 2023

Chem. Rev.

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Section: Introductionmentioning

confidence: 99%

“…These distinctive properties endow ICs with a range of unique applications, including hydrogen storage [2,3], catalysis [4,5], shape memory [6,7], superconductors [8,9], and structural applications [10,11]. Structural applications are especially advantageous when high-temperature-resistant components are required due to the high melting and disordering temperatures, high stiffness, and low diffusivity of ICs [10,11]. Moreover, IC may have also been applicable for ballistic protection due to relatively low density (aluminide ICs), high strain hardening rate, enhanced oxidation and temperature resistance, and some formulations containing minimal or no critical raw materials [12,13].…”

Section: Introductionmentioning

confidence: 99%

Load-Independent Hardness and Indentation Size Effect in Iron Aluminides

Balos,

Pecanac,

Trivkovic

et al. 2024

Materials

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In this paper, an iron–aluminide intermetallic compound with cerium addition was subjected to Vickers microhardness testing. A full range of Vickers microhardness loadings was applied: 10, 25, 50, 100, 200, 300, 500, and 1000 g. Tests were conducted in two areas: 0.5 mm under the surface of the rolled specimen and in the center. The aim was to find the optimal loading range that gives the true material microhardness, also deemed load-independent hardness, HLIH. The results suggest that in the surface area, the reverse indentation size effect (RISE) occurred, similar to ceramics and brittle materials, while in the center, indentation size effect (ISE) behavior was obtained, more similar to metals. This clearly indicated an optimal microhardness of over 500 g in the surface region and over 100 g in the central region of the specimen. Load dependencies were quantitatively described by Meyer’s law, proportional specimen resistance (PSR), and the modified PSR model. The modified PSR model proved to be the most adequate.

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“…1a). [38][39][40][41][42][43] HEAs, with their distinctive attributes, offer a pathway to enhancing catalytic performance through the deliberate manipulation of composition and geometric structures. The elevated entropy intrinsic to HEAs serves to dismantle the boundaries of immiscibility among constituent elements, thereby facilitating robust control over element concentrations and the consequent optimization of catalytic attributes.…”

Section: Introductionmentioning

confidence: 99%