Strengthening the FeCoCrNiMo0.15 high entropy alloy by a gradient structure

Guo, Lin; Wu, Wenqian; Ni, Song; Yuan, Zhao; Cao, Yang; Zhangwei, Wang; Song, Min

doi:10.1016/j.jallcom.2020.155688

Cited by 34 publications

(3 citation statements)

References 45 publications

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“…В обзорах [11 -14] проанализированы способы повышения механических свойств высокоэнтропийных сплавов CoCrFeNiAl и CoCrFeNiMn ввиду возможных областей их промышленного использования. Решение этой проблемы предполагало усиление зернограничного упрочнения [10], твердорастворного упрочнения, создание нанокристаллического состояния, упрочнение выделениями, частичной аморфизацией, использование упрочняющих поверхностных обработок, разработку новых способов получения ВЭС [14 -19], ультразвуковое воздействие [20], формирование градиентов структуры [21] и т.д. Такие подходы могут стимулировать значительное расширение областей применения этих ВЭС.…”

Section: Introductionunclassified

Ways to improve the properties of high-entropy alloys Cantor CoCrFeNiMn and CoCrFeNiAl

Gromov,

Konovalov,

Efimov

et al. 2024

Izv. vysš. učebn. zaved., Čern. metall.

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Created one of the first and studied more than 20 years ago, high-entropy five-component alloys CoCrFeNiMn (Cantor alloy) and CoCrFeNiAl still attract the attention of researchers in the field of physical materials science due to their possible application in various industries because of their successful combination of strength and plastic properties. To date, a large amount of experimental materials has been accumulated on the ways to control the properties of these alloys. This article reviews the publications of domestic and foreign authors in two areas of improving the properties of these alloys: alloying, precipitation and heat treatment, and the use of CALPHAD phase diagrams. In the first direction, the role of alloying with B, Al, V, Si, Nb is analyzed; γ and γ′ nanoprecipitations, various modes of thermal and deformation processing. It was concluded that it is necessary to conduct experiments on the alloying of HEAs with Zr and Nb, which have proven themselves well in hardening steels. Creation and modification of the properties of five-component HEAs is possible using the CALPHAD computer programs developed for calculating state diagrams. The results of publications on the thermodynamic description of five-component alloys analyzed in the article are confirmed by comparing the phase diagrams with the available experimental data. In one of the analyzed works on the phase formation of five-component HEAs consisting of Co, Cr, Fe, Ni, Al, Mn, Cu, 2436 compositions were considered, which made it possible to determine 1761 variants of reliable prediction of the formation of bcc/B2 and fcc phases, bypassing amorphous phases and intermetallic compounds, thereby designing a certain level of mechanical properties. It is shown that the design of a new generation of HEAs is possible based on calculation of the CALPHAD phase diagrams.

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Section: Introductionunclassified

Ways to improve the properties of high-entropy alloys Cantor CoCrFeNiMn and CoCrFeNiAl

Gromov,

Konovalov,

Efimov

et al. 2024

Izv. vysš. učebn. zaved., Čern. metall.

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“…[5][6][7] The strain gradient of gradient metals and alloys can be induced under the action of uniaxial stretching, which leads to the transformation of uniaxial stress into multi-axial stress. 8,9 The mechanism of this process diverts uniaxial stress in all directions due to the discordant deformation of gradient grains; this unusual extra strain hardening ensures the maximization of the mechanical properties of metals and alloys at low cost. Constructing non-uniform gradients of metals and alloys provides an important strategy for developing strong and ductile materials.…”

Section: Introductionmentioning

confidence: 99%

Double strengthening induced by grain boundary segregation of solute elements in gradient nano Ni–Co alloys

Zhang,

Guo,

Ren

et al. 2023

Phys. Chem. Chem. Phys.

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“…The most fundamental physical reason behind the reported strength-ductility synergy is the strain hardening and back stress strengthening which is caused by the mechanical incompatibility between the surface and center regions of materials. [46] A review of the literatures indicated that the HEAs with gradient structures can be beneficial to the both strength and ductility. However, the effect of gradient structure on the mechanical properties of materials is not obvious because there may have a lot of structural defects (such as point, line, and planar defects), which can lead to the low mechanical performance of materials with gradient structures.…”

Section: Introductionmentioning

confidence: 99%

On the Real‐Time Atomistic Deformation of the CoNiCrFeMn High‐Entropy Alloy with Gradient Structures

Mohammadzadeh

Heidarzadeh

2021

Physica Status Solidi (a)

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Molecular dynamic simulations are used to correlate gradient structure and mechanical properties of a CoNiCrFeMn high-entropy alloy (HEA) by characterizing the structural evolution and dislocation substructures during tensile loading. The gradient distributions of deformation faults, dislocations, and grain size from the surface to the center of samples are explored in detail. Quantitative analysis indicates that improvement of strength is attributed to the high densities of dislocations and deformation faults in the grain interior. Moreover, the results reveal that the energy barrier for nucleation of deformation faults in the deformed layer of gradient HEA is higher than that of the ungradient sample. The high strength and work hardening of gradient HEA are attributed to the bundles of concentrated dislocations, which are distributed in grain interiors. This study helps to fundamental understanding of the deformation mechanisms of HEAs with gradient structure, which can be used to strength-ductility trade-off.

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Strengthening the FeCoCrNiMo0.15 high entropy alloy by a gradient structure

Cited by 34 publications

References 45 publications

Ways to improve the properties of high-entropy alloys Cantor CoCrFeNiMn and CoCrFeNiAl

Ways to improve the properties of high-entropy alloys Cantor CoCrFeNiMn and CoCrFeNiAl

Double strengthening induced by grain boundary segregation of solute elements in gradient nano Ni–Co alloys

On the Real‐Time Atomistic Deformation of the CoNiCrFeMn High‐Entropy Alloy with Gradient Structures

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