Mechanical Performance Improvement by Nitrogen Addition in N-CoCrNi Compositionally Complex Alloys

Jodi, Dennis Edgard; Choi, Nuri; Park, Joo Hyun; Park, Nokeun

doi:10.1007/s11661-020-05738-9

Cited by 16 publications

(5 citation statements)

References 51 publications

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“…%): these effects have been attributed to the increase of lattice friction, planar dislocation slip and twinning activation. Similar effects have been observed by Jodi et al [20], [21] and Moravcik et al [21] on the ternary alloy CoCrNi containing 0.95 at. % N (0.24 wt.…”

Section: -Introductionsupporting

confidence: 87%

“…Similarly, nitrogen additions as an alloying element in bulk HEA has already been reported in several studies. While in most of them, nitrogen is introduced in the alloy during melting thanks to a high gas pressure [20], [21], [22], [23], it can also be introduced into the molten alloy in the form of nitride like FeCrN 2 [24], [25], [26], [27] or during mechanical alloying with nitride powders [28], [29]. Han et al [23], have shown the efficiency of nitrogen to increase the mechanical resistance of a cold-rolled Cantor alloy doped with 0.52 at.% of N (0.13 wt.…”

Section: -Introductionmentioning

confidence: 99%

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Nitrogen-induced hardening in an austenitic CrFeMnNi high-entropy alloy (HEA)

Traversier

Mestre-Rinn

Peillon

et al. 2021

Materials Science and Engineering: A

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Nitrogen is a well-known gamma-stabiliser in austenitic steels, also responsible for significant solid solution hardening of these materials. Yet, only few papers have studied its impact on austenitic high-entropy alloy (HEA) matrixes. This study focuses on a cobalt-free, non equimolar CrFeMnNi HEA doped with nitrogen. A series of alloys was cast under a nitriding atmosphere to promote nitrogen absorption into the liquid alloy. Study of as-cast alloys has shown nitrogen presence in solid solution up to 0.3 wt. % (1.2 at. %). Over the whole range of compositions, a linear increase of hardness (134 HV/wt. % of N) was measured as well as an expansion of the lattice parameter of a/a= 1.01 / wt. % N due to nitrogen addition in the interstitial sites of the lattice. Tests on forged and annealed samples showed that the increase of hardness with nitrogen addition is higher than in as-cast state (210 HV / wt. % of N) surely due to presence of other strengthening mechanisms. Tensile tests confirmed that the presence of dissolved nitrogen increases yield strength and ultimate strength and enhances strain-hardening, without any modification of ductility.

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Section: -Introductionsupporting

confidence: 87%

Section: -Introductionmentioning

confidence: 99%

Nitrogen-induced hardening in an austenitic CrFeMnNi high-entropy alloy (HEA)

Traversier

Mestre-Rinn

Peillon

et al. 2021

Materials Science and Engineering: A

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“…To validate the reliability of our experimental procedures, we conducted additional experiments on a CrCoNi alloy which is one 38 of the previously reported alloys shown in Fig. 3e, f.…”

Section: Tensile Propertiesmentioning

confidence: 87%

“…The process conditions for the CrCoNi alloy were homogenization at 1473 K, rolling at a rate of 90%, annealing at 1173 K, and annealing time of 30 min. The mechanical properties of the alloy reported in the original literature 38 were YS of 389 MPa, UTS of 859 MPa, and T.EL. of 74%.…”

Section: Tensile Propertiesmentioning

confidence: 98%

A neural network model for high entropy alloy design

et al. 2023

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A neural network model is developed to search vast compositional space of high entropy alloys (HEAs). The model predicts the mechanical properties of HEAs better than several other models. It’s because the special structure of the model helps the model understand the characteristics of constituent elements of HEAs. In addition, thermodynamics descriptors were utilized as input to the model so that the model predicts better by understanding the thermodynamic properties of HEAs. A conditional random search, which is good at finding local optimal values, was selected as the inverse predictor and designed two HEAs using the model. We experimentally verified that the HEAs have the best combination of strength and ductility and this proves the validity of the model and alloy design method. The strengthening mechanism of the designed HEAs is further discussed based on microstructure and lattice distortion effect. The present alloy design approach, specialized in finding multiple local optima, could help researchers design an infinite number of new alloys with interesting properties.

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“…In some steels, interstitial N doping was more advantageous than C doping due to its higher solubility and slower kinetics in the formation of nitrides compared to the formation of carbides [130][131][132] . N doping was found to be a cost-effective method to improve the mechanical properties of conventional alloys.…”

Section: Interstitial Elements (B C N and Si)mentioning

confidence: 99%

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Xu¹,

Wang²,

Li³

et al. 2022

Microstructures

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The CoCrFeMnNi alloy is one of the most notable first-generation high-entropy alloys and is also known as a Cantor alloy. This alloy was first proposed in 2004 and shows promising performance at cryogenic temperatures (CTs). Subsequent research has indicated that the equiatomic ternary CoCrNi medium-entropy alloy (MEA), as a subset of the Cantor alloy family, has better mechanical properties than the CoCrFeMnNi alloy. Interestingly, both the strength and ductility of the CoCrNi MEA are higher at CTs than at room temperature. CoCrNi-based alloys have attracted considerable attention in the metallic materials community and it is therefore important to generalize and summarize the latest progress in CoCrNi-based MEA research. The present review initially briefly introduces the discovery of the CoCrNi MEA. Subsequently, its tensile response and deformation mechanisms are summarized. In particular, the effects of parameters, such as critical resolved shear stress, stacking fault energy and short-range ordering, on the deformation behavior are discussed in detail. The methods for strengthening the CoCrNi MEA are then reviewed and divided into two categories, namely, modifying microstructures and adjusting chemical compositions. In addition, the mechanical performance of CoCrNi-based MEAs, including their dynamic shear properties, creep behavior and fracture toughness, is also deliberated. Finally, the development prospects of CoCrNi-based MEAs are proposed.

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Mechanical Performance Improvement by Nitrogen Addition in N-CoCrNi Compositionally Complex Alloys

Cited by 16 publications

References 51 publications

Nitrogen-induced hardening in an austenitic CrFeMnNi high-entropy alloy (HEA)

Nitrogen-induced hardening in an austenitic CrFeMnNi high-entropy alloy (HEA)

A neural network model for high entropy alloy design

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

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