Effect of γ′-phase particles on the orientation and temperature dependence of the mechanical behaviour of Al0.3CoCrFeNi high-entropy alloy single crystals

Киреева, И. В.; Chumlyakov, Yu. I.; Pobedennaya, Z. V.; Vyrodova, A.V.

doi:10.1016/j.msea.2019.138772

Cited by 24 publications

(33 citation statements)

References 30 publications

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“…In Al 0.3 CoCrFeNi HEA single crystals, only coherent particles of the c′-phase were detected during aging 50 h at 893 K. The interaction of slip dislocations with c′-phase particles occurred via a shearing mechanism and the contribution to the hardening from c′-phase particles was 25-30 MPa. The absence of grain boundaries also suppressed the formation of B2phase particles in Al 0.3 CoCrFeNi HEA single crystals (Kireeva et al, 2020).…”

Section: Kinetic Way Of Tailoring Phasesmentioning

confidence: 93%

Thermal–Mechanical Processing and Strengthen in AlxCoCrFeNi High-Entropy Alloys

Yang

Wang

et al. 2021

Front. Mater.

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In this study high-entropy alloys (HEAs) were devised based on a new alloy design concept, which breaks with traditional design methods for conventional alloys. As a novel alloy, HEAs have demonstrated excellent engineering properties and possible combinations of diverse properties for their unique tunable microstructures and properties. This review article explains the phase transition mechanism and mechanical properties of high-entropy alloys under the thermal-mechanical coupling effect, which is conducive to deepening the role of deformation combines annealing on the structure control and performance improvement of high-entropy alloys, giving HEAs a series of outstanding performance and engineering application prospect. To reach this goal we have explored the microstructural evolution, formation of secondary phases at high and/or intermediate temperatures and their effect on the mechanical properties of the well known AlxCoCrFeNi HEAs system, which not only has an important role in deepening the understanding of phase transition mechanism in AlxCoCrFeNi HEAs, but also has important engineering application value for promoting the application of high-entropy alloys.

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Section: Kinetic Way Of Tailoring Phasesmentioning

confidence: 93%

Thermal–Mechanical Processing and Strengthen in AlxCoCrFeNi High-Entropy Alloys

Yang

Wang

et al. 2021

Front. Mater.

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“…The dislocation structure of the deformed crystals with -phase nanoparticles reveals a pileup with paired dislocations (from 5 to 7 pairs) at its head (Fig. 2b), suggesting that such particles feature a long-range order and interact with dislocations by a shearing mechanism [10]. The particle size d estimated as d = nb = 2.5-3.5 nm, where n is the number of paired dislocations in a pileup and b = 0.25 nm is the Burgers vector magnitude of a perfect dislocation a/2110, is close to d observed in a superstructure reflection (Fig.…”

Section: Temperature Dependence Of Critical Shearmentioning

confidence: 99%

“…2a). In single-and polycrystalline (CoCrFeNi) 93 Al 7 (free of Ti), such particles of size 5 nm precipitate on aging at 823 K for 150 h and at 893 K for 50 h [10,17]. The radius of Ti atoms is larger than that of Al atoms [8,11], and hence, the diffusion mobility of Ti is lower than the diffusion of mobility of Al.…”

Section: Temperature Dependence Of Critical Shearmentioning

confidence: 99%

“…According to hardening models which assume additive contributions to  cr [8,10,13,17,18], the value of  cr in single crystals with ordered precipitates is determined by the sum of contributions from substitutional atoms  ss , from elastic stress fields  e due to misfitting particle and matrix lattices, from  pm due to misfitting particle and matrix shear moduli, and from  lro of long-range order:…”

Section: Temperature Dependence Of Critical Shearmentioning

confidence: 99%

“…However, at above T = 296 K, the yield stress  0.1 in these alloys is low [3][4][5], and methods of increasing  0.1 are needed to extend their practical application. Among such methods can be, for example, grain refinement, solid solution hardening with interstitial atoms (nitrogen, carbon) or substitutional atoms of larger radius, and dispersion hardening [3,4,[6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Behavior of Differently Oriented (CoCrFeNi)94Ti2Al4 Single Crystals

et al. 2021

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The paper analyzes the mechanical behavior and plastic deformation mechanisms (slip, twinning) in single-crystalline high-entropy fcc alloy (CoCrFeNi) 94 Ti 2 Al 4 (at %) in relation to the crystal orientation ([144] , [001]), type of deformation (tension, compression), and heat treatment (quenching, aging at 923 K for 4 h). The analysis shows that after aging at 923 K for 4 h, compared to quenching, the critical shear stress of such crystals increases by 20-30 MPa at 77-973 K due precipitated -phase particles of size 3-5 nm. The onset of their plastic flow, irrespective of the heat treatment, is associated with slip such that their critical shear stress depends neither on the crystal orientation nor on the type of deformation (tension, compression) at 77-973 K. When deformed at 77-973 K after quenching or aging, the [144] and [001] crystals reveal a planar structure with dislocation pileups. In the quenched and aged [144] crystals, twinning occurs after previous tensile slip deformation to 40% at 77 K. The stages of flow curves, the strain hardening coefficient, and the plasticity of the crystals are found to depend on their orientation, test temperature, and heat treatment. The dependences of the strain hardening coefficient of the crystals on their orientation and temperature in tension are discussed. A method is proposed for attaining a high yield strength in single-crystalline highentropy (CoCrFeNi) 94 Ti 2 Al 4 under tension at above 296 K.

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Strain Amplitude Dependence of Internal Friction in a Cu–Al–Mn Shape Memory Alloy

Jiao

Yin

Zhang

et al. 2022

Physica Status Solidi (a)

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Strain amplitude (SA) dependence of internal friction (IF) in a Cu–Al–Mn shape memory alloy (SMA) is investigated. Microstructure observation is conducted with the aim to clarify related mechanisms. It is found that the IF measured during the continuous heating process shows a nonmonotonous dependence on SA, that is, the IF increases first and then decreases. The increase of IF can be attributed to the mergence of martensite laths promoted by the reorientation of martensite variants, whereas the decrease of IF is related to the decrease in the density of moveable interfaces. The isothermal IF measured at low temperatures increases monotonously with the increase in SA, because the density of movable interfaces and the sliding distance of these interfaces in the tangential direction increase. Thermal cycles can significantly improve the isothermal IF because of the annihilation of quenched‐in vacancies and the reorientation of martensite variants. At around 240 °C, the isothermal IF in all specimens shows a nonmonotonous dependence on SA, which can be ascribed to the dragging effect of quenched‐in vacancies on dislocations and the breakaway of dislocations from these vacancies when the SA is high enough.

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Effect of γ′-phase particles on the orientation and temperature dependence of the mechanical behaviour of Al0.3CoCrFeNi high-entropy alloy single crystals

Cited by 24 publications

References 30 publications

Thermal–Mechanical Processing and Strengthen in AlxCoCrFeNi High-Entropy Alloys

Thermal–Mechanical Processing and Strengthen in AlxCoCrFeNi High-Entropy Alloys

Mechanical Behavior of Differently Oriented (CoCrFeNi)94Ti2Al4 Single Crystals

Strain Amplitude Dependence of Internal Friction in a Cu–Al–Mn Shape Memory Alloy

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