Influence of hydrogen behaviors on tensile properties of equiatomic FeCrNiMnCo high-entropy alloy

Zhu, Te; Zhong, Zhihong; Ren, X.L.; Song, Yamin; Ye, F.J.; Wang, Q.Q.; Ngan, A.H.W.; Wang, B.Y.; Cao, Xingzhong; Xu, Qiu

doi:10.1016/j.jallcom.2021.162260

Cited by 21 publications

(2 citation statements)

References 28 publications

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“…However, it was found that the local enrichment of H decreases F at a similar magnitude across different alloys with nanoscale chemical heterogeneities [31]. Ab initio molecular dynamics (AIMD) calculations also suggest that the effective H diffusion coefficient of 316 stainless steel and the FeCrNiMnCo alloys are very close [36]. These indicate that the H absorption and trapping characteristics are insufficient to describe the effect of chemical heterogeneities on HE-resistance.…”

Section: Nanoscale Chemical Heterogeneities In Highlymentioning

confidence: 99%

Ab Initio Investigations for the Role of Compositional Complexities in Affecting Hydrogen Trapping and Hydrogen Embrittlement: A Review

Zhang

Mao

Liu

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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Hydrogen embrittlement (HE) seriously restricts the service safety of structural metallic materials applicate in aerospace, ocean, and transportation. Recent studies aiming at increasing the HE-resistance have been focusing on trapping diffusible H atoms by inherent microstructural features in materials. Alloying-induced compositional complexities, including different types of solute atoms, lattice chemical heterogeneities, and carbide precipitates, have attracted research efforts regarding the H trapping capabilities and potential to reduce the susceptibility to HE. In this paper, we review recent progress in exploiting compositional complexities to regulate the hydrogen trapping characteristics and mechanical properties in H-containing environments. The focus is placed on results and insights from ab initio calculations based on density functional theory (DFT). Quantitative predictions of trapping parameters and atomic scale details that are hardly to be gained through traditional experimental characterizations are provided. Additionally, we overview the electronic/atomistic mechanisms of H trapping energetics in metallic materials. Finally, we propose some key challenges and prospects in simulation of defect interactions, interpretation of experimental characterizations, and developing microstructure-based H diffusion prediction models. For the applications of first principle calculations, we illustrate how the DFT data can complement experimental characterizations to guide composition and microstructure design for better HE-resistant materials.

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Section: Nanoscale Chemical Heterogeneities In Highlymentioning

confidence: 99%

Ab Initio Investigations for the Role of Compositional Complexities in Affecting Hydrogen Trapping and Hydrogen Embrittlement: A Review

Zhang

Mao

Liu

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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“…Son et al [19] developed a CoCrFeMnNi HEA through a vacuum induction melting furnace and the results showed that the CoCrFeMnNi HEA exhibited improved antifouling properties compared to 304 stainless steel. The mechanical behavior of most HEAs is affected by the presence of hydrogen embrittlement in the grain boundaries, which was recently studied by Zhu et al [20] who developed FeCrNiMnCo HEA. Daryoush et al [21] studied the crystallization kinetics and amorphization of both equiatomic and non-equiatomic AlFeCuZnTi HEAs synthesized by high-energy ball milling.…”

Section: Introductionmentioning

confidence: 99%

Influence of V and Zn in FeCrCuMnTi High-Entropy Alloys on Microstructures and Uniaxial Compaction Behavior Prepared by Mechanical Alloying

2021

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The densification behavior of FeCrCuMnTi (HEA1), FeCrCuMnTiV (HEA2), and FeCrCuMnTiVZn (HEA3) equiatomic high-entropy alloys (HEAs) was explored using different uniaxial quasi-static controlled compaction (1 mm/min). These HEAs were synthesized by mechanical alloying (MA, speed: 300 rpm, BPR: 10:1, time: 25 h). Various phase formations, structural characteristics (crystallite size, lattice strain, and lattice constant), thermo-dynamic calculations, powder surface morphologies, detailed microstructural evolutions, and chemical compositions were examined using X-ray diffraction, high-resolution scanning electron microscopy, and high-resolution transmission electron microscopy. The XRD results revealed the formation of multiple solid solutions (FCC, BCC, and HCP) due to the variation in entropy, and the presence of high-strength elements (Cr, Ti, and V) in the developed HEA alloys. The synthesized powders were consolidated into bulk green samples with different compaction pressures starting from 25 to 1100 MPa under as-milled and milled under stress recovery conditions (150 °C, 1 h). The incorporation of V in the FeCrCuMnTi HEA resulted in improved densification due to a greater reduction in particle size, and high configurational entropy. Furthermore, the stress-recovered powder samples produced more relative density owing to the elimination of lattice strain. Several linear and non-linear compaction models were applied to predict densification behavior. The non-linear Cooper and Eaton model produced the highest regression coefficients compared to the other models.

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Mechanical Properties and Hydrogen Embrittlement Resistance of the High‐Entropy Alloy CrFeMnNiCo and Its Subsystems

Xu,

Guan,

Huang

et al. 2024

Physica Status Solidi (b)

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The effects of hydrogen on the mechanical properties of CrNiCo and CrFeNiCo medium‐entropy alloys (MEAs) and CrFeMnNiCo high‐entropy alloys (HEAs) are investigated. Although their total elongation is less than that of the commonly used stainless steel (SS) 316L (SS316L), the tensile strengths of HEAs and MEAs are 150–350 MPa higher than that of SS316L. Hydrogen charging up to 1400 appm (nominal concentration) does not affect the tensile strength of SS316L; however, it decreases the elongation by less than 20%. In contrast, hydrogen increases the tensile strength of MEAs and HEA, but has little effect on elongation. Among the MEAs and HEAs, CrNiCo exhibits the highest tensile strength and total elongation. No brittle fracture due to hydrogen is observed on the fracture surfaces of the H‐charged samples. However, nanotwin structures are more common in H‐charged MEAs and HEAs than in H‐uncharged MEAs and HEA. Additionally, the calculation results based on the first‐principles reveal for the first time that single vacancies or tiny vacancy clusters do not trap H in MEAs compared to HEAs, such that cracks due to H are unlikely to occur. Thus, the hydrogen embrittlement resistance of MEAs may be improved.

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Influence of hydrogen behaviors on tensile properties of equiatomic FeCrNiMnCo high-entropy alloy

Cited by 21 publications

References 28 publications

Ab Initio Investigations for the Role of Compositional Complexities in Affecting Hydrogen Trapping and Hydrogen Embrittlement: A Review

Ab Initio Investigations for the Role of Compositional Complexities in Affecting Hydrogen Trapping and Hydrogen Embrittlement: A Review

Influence of V and Zn in FeCrCuMnTi High-Entropy Alloys on Microstructures and Uniaxial Compaction Behavior Prepared by Mechanical Alloying

Mechanical Properties and Hydrogen Embrittlement Resistance of the High‐Entropy Alloy CrFeMnNiCo and Its Subsystems

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