Origins of strength and plasticity in the precious metal based high-entropy alloy AuCuNiPdPt

Thiel, F. A.; Geißler, David; Nielsch, Kornelius; Kauffmann, Alexander; Seils, Sascha; Heilmaier, Martin; Utt, Daniel; Albe, Karsten; Motylenko, Mykhaylo; Rafaja, David; Freudenberger, J.

doi:10.1016/j.actamat.2019.12.020

Cited by 35 publications

(7 citation statements)

References 52 publications

(99 reference statements)

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“…is between 4 • 10 −2 (Cu, Ni) and 7 • 10 −2 (Pt) [24]. Four of five elements of the alloy from this work showed higher and, thus, higher tendency for clustering [21], which might arise from segregation.…”

Section: Microstructural and Chemical Analysismentioning

confidence: 65%

“…Hence, the µ values from this work were only compared with those of AuCuNiPdPt, reported by Thiel et al [24]. µ is between 4 • 10 −2 (Cu, Ni) and 7 • 10 −2 (Pt) [24]. Four of five elements of the alloy from this work showed higher µ and, thus, higher tendency for clustering [21], which might arise from segregation.…”

Section: Microstructural and Chemical Analysismentioning

confidence: 69%

“…Moody et al [21] emphasize that varies with the number of elements and their concentrations. Hence, the values from this work were only compared with those of AuCuNiPdPt, reported by Thiel et al [24].…”

Section: Microstructural and Chemical Analysismentioning

confidence: 99%

“…µ values of all elements within the entire APT tip were determined (Table 2) and are in the range of 5.1 • 10 −2 (Hf) up to 24.7 • 10 −2 (Ta). The parameter µ has already been used for quantifying the chemical homogeneity of other HEAs, such as of non-equiatomic FeMnNiCoCr [22], quaternary NbTaTiV [23] and quinary, equiatomic AuCuNiPdPt [24]. Moody et al [21] emphasize that µ varies with the number of elements and their concentrations.…”

Section: Microstructural and Chemical Analysismentioning

confidence: 99%

“…Four of five elements of the alloy from this work showed higher µ and, thus, higher tendency for clustering [21], which might arise from segregation. APT experiments of this work and of [24] were conducted on the exact same APT device. Hence, a µ-variation by differing experimental procedures can be excluded.…”

Section: Microstructural and Chemical Analysismentioning

confidence: 99%

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Influence of Temperature and Plastic Strain on Deformation Mechanisms and Kink Band Formation in Homogenized HfNbTaTiZr

et al. 2021

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Due to its outstanding ductility over a large temperature range, equiatomic HfNbTaTiZr is well-suited for investigating the influence of temperature and plastic strain on deformation mechanisms in concentrated, body centered cubic solid solutions. For this purpose, compression tests in a temperature range from 77 up to 1073 K were performed and terminated at varying plastic strains for comparison of plastic deformation behavior. The microstructure and chemical homogeneity of a homogenized HfNbTaTiZr ingot were evaluated on different length scales. The compression tests reveal that test temperature significantly influences yield strength as well as work hardening behavior. Electron backscatter diffraction aids in shedding light on the acting deformation mechanisms at various temperatures and strains. It is revealed that kink band formation contributes to plastic deformation only in a certain temperature range. Additionally, the kink band misorientation angle distribution significantly differs at varying plastic strains.

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Section: Microstructural and Chemical Analysismentioning

confidence: 65%

Section: Microstructural and Chemical Analysismentioning

confidence: 69%

Section: Microstructural and Chemical Analysismentioning

confidence: 99%

Section: Microstructural and Chemical Analysismentioning

confidence: 99%

Section: Microstructural and Chemical Analysismentioning

confidence: 99%

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Influence of Temperature and Plastic Strain on Deformation Mechanisms and Kink Band Formation in Homogenized HfNbTaTiZr

et al. 2021

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Revisiting Stability Criteria in Ball‐Milled High‐Entropy Alloys: Do Hume–Rothery and Thermodynamic Rules Equally Apply?

Blázquez,

Manchón‐Gordón,

Vidal‐Crespo

et al. 2024

Adv Eng Mater

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Stability descriptors for the formation of solid solutions can be divided into two categories: inspired by Hume–Rothery rules (HRR) and derived from thermodynamic approaches. Herein, HRRs are extended from binary to high‐entropy alloys (HEAs) focusing on compositions prepared by ball milling. Parameters describing stability criteria are interrelated and implicitly account for the microstrains’ storage energy, more determinant than entropy increase in stabilization of HEAs and more effective in bcc structures than close‐packed ones (fcc and hcp). An effective temperature, Teff, is defined as the ratio between increase in metallic bonding energy of solid solutions with respect to segregated pure constituents and configurational entropy. This versatile parameter is used as a threshold for stabilization of HEAs at equilibrium and out of equilibrium. When Teff is below room temperature, HEA would be stable at equilibrium. When Teff is below melting temperature, HEA would be obtained by rapid quenching. Limitations related to electronegativity differences remain valid in mechanically alloyed solid solutions. However, ball milling broadens the allowed differences in atomic size to form HEA. Moreover, thermodynamic criteria can be surpassed in these systems, allowing the formation of single‐phase solid solutions beyond the compositional range predicted by those criteria.

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Deciphering Indirect Nitrite Reduction to Ammonia in High‐Entropy Electrocatalysts Using In Situ Raman and X‐ray Absorption Spectroscopies

Begildayeva,

Theerthagiri,

Limphirat

et al. 2024

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This research adopts a new method combining calcination and pulsed laser irradiation in liquids to induce a controlled phase transformation of Fe, Co, Ni, Cu, and Mn transition‐metal‐based high‐entropy Prussian blue analogs into single‐phase spinel high‐entropy oxide and face‐centered cubic high‐entropy alloy (HEA). The synthesized HEA, characterized by its highly conductive nature and reactive surface, demonstrates exceptional performance in capturing low‐level nitrite (NO2−) in an electrolyte, which leads to its efficient conversion into ammonium (NH4+) with a Faradaic efficiency of 79.77% and N selectivity of 61.49% at −0.8 V versus Ag/AgCl. In addition, the HEA exhibits remarkable durability in the continuous nitrite reduction reaction (NO2−RR), converting 79.35% of the initial NO2− into NH4+ with an impressive yield of 1101.48 µm h−1 cm−2. By employing advanced X‐ray absorption and in situ electrochemical Raman techniques, this study provides insights into the indirect NO2−RR, highlighting the versatility and efficacy of HEA in sustainable electrochemical applications.

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Origins of strength and plasticity in the precious metal based high-entropy alloy AuCuNiPdPt

Cited by 35 publications

References 52 publications

Influence of Temperature and Plastic Strain on Deformation Mechanisms and Kink Band Formation in Homogenized HfNbTaTiZr

Influence of Temperature and Plastic Strain on Deformation Mechanisms and Kink Band Formation in Homogenized HfNbTaTiZr

Revisiting Stability Criteria in Ball‐Milled High‐Entropy Alloys: Do Hume–Rothery and Thermodynamic Rules Equally Apply?

Deciphering Indirect Nitrite Reduction to Ammonia in High‐Entropy Electrocatalysts Using In Situ Raman and X‐ray Absorption Spectroscopies

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