High-entropy intermetallic compound with ultra-high strength and thermal stability

Yao, Kunda; Liu, Liang; Ren, Jie; Guo, Yong; Liu, Yanfang; Cao, Yang; Feng, Rui; Wu, F. F.; Qi, Jingang; Luo, Jian; Liaw, Peter K.; Chen, Wen

doi:10.1016/j.scriptamat.2020.113674

Cited by 59 publications

(11 citation statements)

References 65 publications

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“…A possible candidate for such an ideal active site structure is a high-entropy intermetallic (HEI). Unlike HEAs, the constituent metals of an HEI are distributed separately to two (or more) crystallographically distinct sites, depending on the parent intermetallic structure. − Scheme illustrates the specific catalyst design concept employed in this regard. We focused on PtGe as the parent binary intermetallics (FeAs-type structure, space group: Pnma ) due to its unique ordered surface structure and significantly negative formation enthalpy (Δ H f = −90.8 kJ mol –1 ) .…”

Section: Introductionmentioning

confidence: 99%

High-Entropy Intermetallics Serve Ultrastable Single-Atom Pt for Propane Dehydrogenation

et al. 2022

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Propane dehydrogenation has been a promising propylene production process that can compensate for the increasing global demand for propylene. However, Pt-based catalysts with high stability at ≥600 °C have barely been reported because the catalysts typically result in short catalyst life owing to side reactions and coke formation. Herein, we report a new class of heterogeneous catalysts using high-entropy intermetallics (HEIs). Pt−Pt ensembles, which cause side reactions, are entirely diluted by the component inert metals in PtGe-type HEIs. The resultant HEI (PtCoCu) (GeGaSn)/Ca−SiO 2 exhibited an outstandingly high catalytic stability, even at 600 °C (k d −1 = τ = 4146 h = 173 d), and almost no deactivation of the catalyst was observed for 2 months for the first time. Detailed experimental studies and theoretical calculations demonstrated that the combination of the site-isolation and entropy effects upon multimetallization of PtGe drastically enhanced the desorption of propylene and the thermal stability, eventually suppressing the side reactions even at high reaction temperatures.

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Section: Introductionmentioning

confidence: 99%

High-Entropy Intermetallics Serve Ultrastable Single-Atom Pt for Propane Dehydrogenation

et al. 2022

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“…High-entropy [11] or porous [12] and classical binary compounds [13][14][15] are widely known. Of particular interest are alloys such as nitinol, which have shape memory, high hardness, and excellent anticorrosion properties [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ti-Cu Multiphase Alloy by Spark Plasma Sintering: Mechanical and Corrosion Properties

Shichalin

Sakhnevich

Buravlev

et al. 2022

Metals

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To study the material based on the binary system Ti + Cu (50% atm), samples were produced from powders of commercially pure metals and additionally ground in a ball mill (final size about 12 µm) by spark plasma sintering. The following intermetallic phases were obtained in the materials: CuTi2, TiCu, and Ti3Cu4. The materials have a hardness of 363 and 385 HV (800 and 900 °C), a microhardness of 393 and 397 µHV, a density of 4.24 and 5.23 kg/m3, and resistance to corrosion in acids (weight gain + 0.002% after 24 h of testing according to ISO 16151 for a sample with 900 °C—the best result in comparison with steel 308, AA2024, CuA110Fe3Mn2). The hardness value varies due to the presence of pure metal agglomerates. The relationship between the temperature of spark plasma sintering and the characteristics of the material (material parameters improve with increasing temperature, segregation is reduced) is revealed.

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“…In addition, Yao 83 et al found that it is preferent for HEAs to form solid solution if 84 the atomic-size difference (δ) is lower than 5.5. 35 Recent studies 85 indicated that HEAs show the single-phase solid solution structures 86 when −16.25 kJ/mol ≤ ΔH ij ≤ ± 5 kJ/mol. 36…”

Section: Introductionmentioning

confidence: 99%

Deformation mechanisms in hexagonal close-packed high-entropy alloys

Wang

Bao

Wang

et al. 2021

Journal of Applied Physics

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High-entropy intermetallic compound with ultra-high strength and thermal stability

Cited by 59 publications

References 65 publications

High-Entropy Intermetallics Serve Ultrastable Single-Atom Pt for Propane Dehydrogenation

High-Entropy Intermetallics Serve Ultrastable Single-Atom Pt for Propane Dehydrogenation

Synthesis of Ti-Cu Multiphase Alloy by Spark Plasma Sintering: Mechanical and Corrosion Properties

Deformation mechanisms in hexagonal close-packed high-entropy alloys

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