Precipitation and Hardness of Carbonitrides in a CrMnFeCoNi High Entropy Alloy

Laurent‐Brocq, Mathilde; Sauvage, Xavier; Akhatova, A.; Perrière, Loïc; Leroy, Éric; Champion, Yannick

doi:10.1002/adem.201600715

Cited by 12 publications

(8 citation statements)

References 17 publications

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“…By doping with both carbon and nitrogen, Laurent-Brocq et al [51] produced carbonitrides in CrMnFeCoNi, which substantially increased the hardness. While possibly technologically useful, it is not possible to determine the interstitial strengthening of carbon or nitrogen from their work.…”

Section: Nitrogen Dopingmentioning

confidence: 99%

Interstitials in f.c.c. High Entropy Alloys

Baker

2020

Metals

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The effects of interstitials on the mechanical properties of single-phase f.c.c. high entropy alloys (HEAs) have been assessed based on a review of the literature. It is found that in nearly all studies, carbon increases the yield strength, in some cases by more than in traditional alloys. This suggests that carbon can be an excellent way to strengthen HEAs. This strength increase is related to the lattice expansion from the carbon. The effects on other mechanical behavior is mixed. Most studies show a slight reduction in ductility due to carbon, but a few show increases in ductility accompanying the yield strength increase. Similarly, some studies show little or modest increases in work-hardening rate (WHR) due to carbon, whereas a few show a substantial increase. These latter effects are due to changes in deformation mode. For both undoped and carbon doped CoCrFeMnNi, the room temperature ductility decreases slightly with decreasing grain size until ~2–5 µm, below which the ductility appears to decrease rapidly. The room temperature WHR also appears to decrease with decreasing grain size in both undoped and carbon-doped CoCrFeMnNi and in nitrogen-doped medium entropy alloy NiCoCr, and, at least for the undoped HEA, shows a sharp decrease at grain sizes <2 µm. Interestingly, carbon has been shown to almost double the Hall–Petch strengthening in CoCrFeMnNi, suggesting the segregation of carbon to the grain boundaries. There have been few studies on the effects of other interstitials such as boron, nitrogen and hydrogen. It is clear that more research is needed on interstitials both to understand their effects on mechanical properties and to optimize their use.

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Section: Nitrogen Dopingmentioning

confidence: 99%

Interstitials in f.c.c. High Entropy Alloys

Baker

2020

Metals

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“…Materials with these properties are desirable for many applications, therefore, there is much interest in these HEA materials. [5][6][7][8][9][10][11][12][13][14][15][16][17] Many dual-phase HEAs, which have face-centered cubic (FCC) and bodycentered cubic (BCC) phases have been studied, and these alloys have excellent properties. [18][19][20] Previous studies have shown that HEAs with an FCC phase usually have good plasticity but relatively low strength.…”

Section: Introductionmentioning

confidence: 99%

“…HEAs have a simple crystal structure, high strength, high hardness, good wear resistance, and outstanding corrosion resistance. Materials with these properties are desirable for many applications, therefore, there is much interest in these HEA materials …”

Section: Introductionmentioning

confidence: 99%

Phase Transition Mechanism and Mechanical Properties of AlCrFe₂Ni₂ High‐Entropy Alloys with Changes in the Applied Carbon Content

You

Guo

et al. 2020

Adv Eng Mater

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To understand the effect of carbon addition on dual‐phase high‐entropy alloys (HEAs), the mechanism of phase transition and mechanical properties of AlCrFe2Ni2Cx (x = 0, 0.06, 0.12, 0.18, 0.24) are investigated systematically. The results show that carbon addition induced the growth and aggregate of disordered noodle‐like face‐centered cubic (FCC) phases. The volume fraction of the FCC phase increases from 33.2% to 51.2% as the C content increases. The Al and Ni in the alloys are segregated at the phase boundaries. Disappearance of the spinodal decomposition structure compose of a disordered body‐centered cubic (BCC) structure and an ordered BCC structure (B2). The BCC phase transform into a spherical B2 phase with increasing C content. The experimental mechanical properties show that the yield strength of the HEAs is closely related to the volume fraction of BCC phase as the C content increases. The ε phase (Cr, C carbonization) precipitate in an FCC phase when the C content is above 2.0 at%. The hardness of the HEAs increases from 310 to 357 HV as the C content increases. The compressive strength and the fracture strain of the alloy decreases as the C content increases.

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“…In addition to the severe lattice distortions and very sluggish elemental diffusions due to different neighboring atomic sites in each lattice [4,5], cocktail effects and high order of elemental interactions make designing of these alloys difficult [1]. In traditional design of MPE alloys only substitutional elements were considered, and the latest designs of MPE alloys that consider interstitial elements or precipitants [6][7][8][9][10] have increased the design intricacy of these alloys. Fundamental studies on phase formations, microstructure evolutions, and structural transformations of these alloys are required.…”

Section: Introductionmentioning

confidence: 99%

A Review of Multi-Scale Computational Modeling Tools for Predicting Structures and Properties of Multi-Principal Element Alloys

Kivy

Hong

Zaeem

2019

Metals

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Multi-principal element (MPE) alloys can be designed to have outstanding properties for a variety of applications. However, because of the compositional and phase complexity of these alloys, the experimental efforts in this area have often utilized trial and error tests. Consequently, computational modeling and simulations have emerged as power tools to accelerate the study and design of MPE alloys while decreasing the experimental costs. In this article, various computational modeling tools (such as density functional theory calculations and atomistic simulations) used to study the nano/microstructures and properties (such as mechanical and magnetic properties) of MPE alloys are reviewed. The advantages and limitations of these computational tools are also discussed. This study aims to assist the researchers to identify the capabilities of the state-of-the-art computational modeling and simulations for MPE alloy research.

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Precipitation and Hardness of Carbonitrides in a CrMnFeCoNi High Entropy Alloy

Cited by 12 publications

References 17 publications

Interstitials in f.c.c. High Entropy Alloys

Interstitials in f.c.c. High Entropy Alloys

Phase Transition Mechanism and Mechanical Properties of AlCrFe₂Ni₂ High‐Entropy Alloys with Changes in the Applied Carbon Content

A Review of Multi-Scale Computational Modeling Tools for Predicting Structures and Properties of Multi-Principal Element Alloys

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Precipitation and Hardness of Carbonitrides in a CrMnFeCoNi High Entropy Alloy

Cited by 12 publications

References 17 publications

Interstitials in f.c.c. High Entropy Alloys

Interstitials in f.c.c. High Entropy Alloys

Phase Transition Mechanism and Mechanical Properties of AlCrFe2Ni2 High‐Entropy Alloys with Changes in the Applied Carbon Content

A Review of Multi-Scale Computational Modeling Tools for Predicting Structures and Properties of Multi-Principal Element Alloys

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Phase Transition Mechanism and Mechanical Properties of AlCrFe₂Ni₂ High‐Entropy Alloys with Changes in the Applied Carbon Content