Effects of stress states and strain rates on mechanical behavior and texture evolution of the CoCrFeNi high-entropy alloy: Experiment and simulation

Lu, P.; Zhang, T.W.; Zhao, Dan; Ma, Shuang; Li, Q.; Wang, T.; Wang, Z.H.

doi:10.1016/j.jallcom.2020.156779

Cited by 27 publications

(5 citation statements)

References 58 publications

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“…Apart from indentation, in the vast majority of papers reporting mechanical tests of HEAs the response was analysed by uniaxial tension [6,11,12,15]. Other types of tests include cyclic tension-compression [14], fatigue [13] and shear-tension experiments [11]. However, it appears no one has systematically studied the yield sur- face of any HEA.…”

Section: Discussionmentioning

confidence: 99%

“…Lu et al [11] applied the classical power law CP coupled with simple damage model to study the effect of strain rates and stress states on mechanical behavior and texture evolution in polycrystalline CoCrFeNi alloy. Gao et al [12] applied a power law plasticity with hardening based on dislocation density evolution to study the mechanical response and texture evolution of NiCoCrFe deforming by slip and twinning.…”

Section: Introductionmentioning

confidence: 99%

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Multiscale nanoindentation modeling of concentrated solid solutions: A continuum plasticity model

Frydrych¹,

Domínguez-Gutiérrez²,

Alava³

et al. 2022

Preprint

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Recently developed single-phase concentrated solid-solution alloys (CSAs) contain multiple elemental species in high concentrations with different elements randomly arranged on a crystalline lattice. These chemically disordered materials present excellent physical properties, including hightemperature thermal stability and hardness, with promising applications to industries at extreme operating environments. The aim of this paper is to present a continuum plasticity model accounting for the first time for the behaviour of a equiatomic five-element CSA, that forms a face-centered cubic lattice. The inherent disorder associated with the lattice distortions caused by an almost equiatomic distribution of atoms, is captured by a single parameter α that quantifies the relative importance of an isotropic plastic contribution to the model. This results in multiple plasticity mechanisms that go beyond crystallographic symmetry-based ones, common in the case of conventional single element metals. We perform molecular dynamics simulations of equiatomic CSAs: NiFe, NiFeCr, NiFeCrCo, and Cantor alloys to validate the proposed continuum model which is implemented in the finite element method and applied to model nanoindentation tests for three different crystallographic orientations. We obtain the representative volume element model by tracking the combined model yield surface.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiscale nanoindentation modeling of concentrated solid solutions: A continuum plasticity model

Frydrych¹,

Domínguez-Gutiérrez²,

Alava³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Thirdly, the shear-driven void coalescence is governed by the shear-driven yield function (denoted by Φ S ) and the corresponding evolution laws for the void characteristics (denoted by Ψ S ). Mathematically, one considers the yield surface (14) and evolution laws for void characteristics (22) as follows Φ = max (Φ G , Φ T , Φ S ) and ( 23)…”

Section: Multi-yield Surface Multi-nonlocal Variable Micromechanics-b...mentioning

confidence: 99%

“…Gao et al [13] characterized the damage and fracture in the CoCrFeNiMo HEA under multi-axial stress states but the behavior was not modeled. Lu et al [14] addressed the damage evolution in the CoCrFeNi alloy. Different stress states were considered, however the emphasis was on the texture and strain rate effects.…”

Section: Introductionmentioning

confidence: 99%

Ductile fracture of high entropy alloys: From the design of an experimental campaign to the development of a micromechanics-based modeling framework

Hilhorst

Leclerc

Pardoen

et al. 2022

Engineering Fracture Mechanics

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“…Nowadays, Ye et al [3] proposed a new concept of alloy design, that is, the alloy containing multiple primary elements has simple structures with fewer phase compositions. These alloys, known as entropy-based alloys, have attracted a lot of attention from researchers because of their superior mechanical properties [4], thermal stability [5] and wear resistance [6,7]. Among them, the equiatomic CoCrFeNi high-entropy alloy (HEA) is one of the most representative HEAs and has achieved some research results.…”

Section: Introductionmentioning

confidence: 99%

Effect of HSO₃⁻ and alternating current on corrosion behaviour and mechanism of CoCrFeNi HEA in a simulated marine environment

Zhang

Zhu

et al. 2023

Corrosion Engineering, Science and Technology

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The corrosion behavior and mechanism of CoCrFeNi HEA under AC application were systematically studied in 3.5 wt.% NaCl solution containing different concentrations of NaHSO 3 . The results showed that the existence of HSO 3 − increased the defect density within the passivation film on the surface of the HEA. With the increase of HSO 3 − concentration, the passivation zone became narrow, E p shifted negatively, and i p increased, which indicated that the corrosion resistance of the HEA was weakened. When the HSO 3 − concentration increased to 0.1 M, a clear transition zone appeared, indicating that the increase in concentration reduced the passivity of the HEA, and its corrosion behavior changed from the typical passivation characteristic to the activation state with increasing i AC . The imposed AC promoted the nucleation of metastable pitting, which was indicated by a remarkable increase in the average pitting number density (N avg ) from 5 to 17 mm −2 with the enhancement of i AC .

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Effects of stress states and strain rates on mechanical behavior and texture evolution of the CoCrFeNi high-entropy alloy: Experiment and simulation

Cited by 27 publications

References 58 publications

Multiscale nanoindentation modeling of concentrated solid solutions: A continuum plasticity model

Multiscale nanoindentation modeling of concentrated solid solutions: A continuum plasticity model

Ductile fracture of high entropy alloys: From the design of an experimental campaign to the development of a micromechanics-based modeling framework

Effect of HSO₃⁻ and alternating current on corrosion behaviour and mechanism of CoCrFeNi HEA in a simulated marine environment

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Effects of stress states and strain rates on mechanical behavior and texture evolution of the CoCrFeNi high-entropy alloy: Experiment and simulation

Cited by 27 publications

References 58 publications

Multiscale nanoindentation modeling of concentrated solid solutions: A continuum plasticity model

Multiscale nanoindentation modeling of concentrated solid solutions: A continuum plasticity model

Ductile fracture of high entropy alloys: From the design of an experimental campaign to the development of a micromechanics-based modeling framework

Effect of HSO3− and alternating current on corrosion behaviour and mechanism of CoCrFeNi HEA in a simulated marine environment

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Effect of HSO₃⁻ and alternating current on corrosion behaviour and mechanism of CoCrFeNi HEA in a simulated marine environment