High entropy alloys: A focused review of mechanical properties and deformation mechanisms

George, E.P.; Curtin, W.A.; Taşan, Cemal Cem

doi:10.1016/j.actamat.2019.12.015

Cited by 1,263 publications

(313 citation statements)

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“…The strong grain refinement of the FCC HEA during HPT at RT is correlated to the high mechanical twinning activity in the medium SFE (≤30 mJm −2 [8,26,27]) alloy [11]. Based on TEM investigations a mechanism of fast grain refinement via primary and secondary twinning has been proposed by Wang et al [28] for brass.…”

Section: Microstructure Developmentmentioning

confidence: 98%

“…In the FCC solid-solution state the Cantor alloy exhibits certain noteworthy mechanical properties, including simultaneous strength and ductility increase with decreasing temperature leading to outstanding fracture toughness at cryogenic temperatures, see recent review [11]. To unravel the deformation mechanisms of these advanced alloys numerous investigations of microstructure and texture have been carried out on polycrystalline samples deformed by tension, wire drawing, swaging, compression, rolling, and high-pressure torsion (HPT), for a recent review see [12].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy

et al. 2020

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The equiatomic face-centered cubic high-entropy alloy CrMnFeCoNi was severely deformed at room and liquid nitrogen temperature by high-pressure torsion up to shear strains of about 170. Its microstructure was analyzed by X-ray line profile analysis and transmission electron microscopy and its texture by X-ray microdiffraction. Microhardness measurements, after severe plastic deformation, were done at room temperature. It is shown that at a shear strain of about 20, a steady state grain size of 24 nm, and a dislocation density of the order of 1016 m−2 is reached. The dislocations are mainly screw-type with low dipole character. Mechanical twinning at room temperature is replaced by a martensitic phase transformation at 77 K. The texture developed at room temperature is typical for sheared face-centered cubic nanocrystalline metals, but it is extremely weak and becomes almost random after high-pressure torsion at 77 K. The strength of the nanocrystalline material produced by high-pressure torsion at 77 K is lower than that produced at room temperature. The results are discussed in terms of different mechanisms of deformation, including dislocation generation and propagation, twinning, grain boundary sliding, and phase transformation.

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Section: Microstructure Developmentmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy

et al. 2020

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“…Some of the HEAs, such us the fcc-based CrCoFeMnNi or the refractory bcc-based TiZrHfNbTa, show superior mechanical properties compared to traditional materials, displaying high hardness, high yield strengths, large ductility, excellent fatigue resistance and good fracture toughness. [33][34][35][36] While accomplishments and progress established in the first generation of HEAs over the last sixteen years is remarkable, detailed thermodynamic analysis of the microstructural evolution in these materials suggests that the initial high-entropy assumption is, however, not always supported by experimental and predictive modelling results. 30 The focus on configurational entropy frequently ignored essential contributions from the enthalpy of mixing to the phase stability.…”

Section: Introductionmentioning

confidence: 99%

Chemical short-range order in derivative Cr–Ta–Ti–V–W high entropy alloys from the first-principles thermodynamic study

Sobieraj

Wróbel

Rygier

et al. 2020

Phys. Chem. Chem. Phys.

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“…[267][268][269][270] In the same way that heterostructured materials are somewhat artificially collected based on heterogenous **In the opinion of the author, a very similar transition has been made between the bulk metallic glass [283,284] community and the high-entropy alloys community. [285][286][287] The existing theory and experimental infrastructure provided the impetus for the shift in focus of a large scientific population in a very short time. microstructural features, SPP methods can be generally constrained with the following rubric:…”

Section: Prospects For Solid Phase Processingmentioning

confidence: 99%

Building on Gleiter: The Foundations and Future of Deformation Processing of Nanocrystalline Metals

Mathaudhu

2020

Metall Mater Trans A

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In 1989, fueled by his prior reports and findings, Prof. Herbert Gleiter published a seminal work on the synthesis, processing, and possibilities for nanocrystalline materials. This spark exploded into the field of bulk nanocrystalline metals by severe plastic deformation processing, with the primary driver being attaining the ultimate strength of a metal through refinement of the grain sizes to a level approaching the theoretically possible limits. This paper will briefly explore the historical development of SPD and based on Turnbull's strategy of ''energizing and quenching'' materials to attain a desirable metastable state, present thoughts on incipient-related areas of exploration, including thermal stabilization through solute additions, the role of trace impurities and interstitials, the smallest grain size achievable (both theoretically and practically), and the captivating yet hazy character and role of the grain boundary. Lastly, some new approaches to making and then controlling the behavior of nanocrystalline materials will be presented. At each stage, opportunities for future study will be raised. On the 50th Anniversary of Metallurgical and Materials Transactions A, it is hoped that this report will build off the seed planted by Gleiter and inspire new work and collaborations in the years to come.

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High entropy alloys: A focused review of mechanical properties and deformation mechanisms

Cited by 1,263 publications

References 326 publications

Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy

Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy

Chemical short-range order in derivative Cr–Ta–Ti–V–W high entropy alloys from the first-principles thermodynamic study

Building on Gleiter: The Foundations and Future of Deformation Processing of Nanocrystalline Metals

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