Mobility of point defects in CoCrFeNi-base high entropy alloys

Hashimoto, Naoyuki; Ono, Yuta

doi:10.1016/j.intermet.2021.107182

Cited by 15 publications

(3 citation statements)

References 20 publications

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“…Moreover, interstitial atoms, which are formed by a point defect, have the tendency of forming grid systems that are a perfect dislocation blocker, and subsequently, increase the wear resistance of HEAs. Hashimoto et al [42] investigated the rate of vacancy mobility on CoCrFeNi-based high-entropy alloys. It was observed that the CoCrFeNiMn possessed a lower vacancy mobility energy than 316 stainless steel, while CoCrFeNiAl 0.3 possessed higher vacancy mobility energy.…”

Section: Point Defectsmentioning

confidence: 99%

Analyzing the Tribology of High-Entropy Alloys Prepared by Spark Plasma Sintering

Ujah,

Kallon,

Aigbodion

2023

Metals

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High-entropy alloys (HEAs) are prospective advanced materials for the production of components that operate at high, severe friction and in high-temperature environments. This is because they possess unique properties requisite for such applications. Hence, this study was aimed at reviewing most recent publications on the tribological characteristics of HEAs processed with spark plasma sintering (SPS). The choice of SPS was because it impacts alloys with a homogenous microstructure, high wear resistance, densely packed grains, and nanocrystalline microstructure. The resource materials for this study were obtained from the Scopus-indexed journal/Google Scholar website for articles published within the last five years. From the study, it was observed that HEAs have good tribological properties which permit their prospective usage in the production of strength-demanding, wear-demanding, and temperature-demanding components. The addition of BCC-forming and FCC-forming elements would help in improving the wear properties of HEAs. It was also observed from the literature that the incorporation of post-processing treatment, laser cladding, shot peening, or the coating of SPSed composites would increase the effective performance and durability of HEAs prepared with SPS.

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Section: Point Defectsmentioning

confidence: 99%

Analyzing the Tribology of High-Entropy Alloys Prepared by Spark Plasma Sintering

Ujah,

Kallon,

Aigbodion

2023

Metals

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“…The orthogonal test design table and the orthogonal test results at this time are displayed in Table 5 below. It can be seen from Table 5 that according to the test results obtained in the above table, range analysis can be conducted to evaluate the influence of various factors on the shot peening process by visual analysis R, as shown in Formula (3) below [36].…”

Section: Optimization Of Shot Peening Process For 2cocrfenialx High-e...mentioning

confidence: 99%

Simulation and Optimization of Shot Peening Process for CoCrFeNiAlx High-Entropy Alloy

Li,

Gou,

Jiang

et al. 2023

Metals

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In this work, Ti-10V-2Fe-3Al alloy was selected as the test material, and the shot peening process of a CoCrFeNiAlx system high-entropy alloy was simulated based on effective test conditions, and the effects of dry shot peening and wet shot peening on the surface properties were determined. Preliminary simulation results the surface of the test sample display a clear plastic deformation state that gradually diminishes and shifts towards the outermost layer. The stress transfer of the test sample gradually decreases, showing a gradient change, and the twin density also shows a random sample change. Then, the high-entropy alloy shot peening process was optimized, and the best process parameters were determined by analyzing the microhardness data, depth of action layer, and surface state. It was found that after wet shot peening, a new characteristic peak is generated, and with the increase in the size of the shot, its overall kinetic energy becomes increasingly higher, the strain energy of the material surface becomes increasingly higher, and the grain refinement is relatively high. This work provides a new approach to investigating the issues that are present during the shot peening process of CoCrFeNiAlx system high-entropy alloys.

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“…The focus has been on the early stages of radiation damage formation, as one of the great promises of this class of materials is increased radiation tolerance compared with traditional alloys. [82][83][84][85][86] Studies on the thermal formation of vacancies in high-entropy alloys are also emerging. [87,88] Interpretation of positron annihilation results in high-entropy alloys faces similar challenges as in the nitride semiconductor alloys discussed earlier, but to a higher degree as the distribution of atoms surrounding a vacancy contains more elements.…”

Section: High-entropy Alloysmentioning

confidence: 99%

Identification of Point Defects in Multielement Compounds and Alloys with Positron Annihilation Spectroscopy: Challenges and Opportunities

Tuomisto

2021

Physica Rapid Research Ltrs

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Three topical materials systems are discussed from the point of view of point defect characterization with positron annihilation spectroscopy. The family of III‐nitride semiconductors and device structures made thereof poses interesting challenges for data interpretation due to preferential localization and annihilation with various elements. Semiconducting oxides with relatively complex crystal lattice structures further highlight the need for combining systematically designed experiments with state‐of‐the‐art theoretical calculations. High‐entropy alloys generate another challenge due to the large number of randomly distributed elements, combining chemical disorder with structural order.

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Mobility of point defects in CoCrFeNi-base high entropy alloys

Cited by 15 publications

References 20 publications

Analyzing the Tribology of High-Entropy Alloys Prepared by Spark Plasma Sintering

Analyzing the Tribology of High-Entropy Alloys Prepared by Spark Plasma Sintering

Simulation and Optimization of Shot Peening Process for CoCrFeNiAlx High-Entropy Alloy

Identification of Point Defects in Multielement Compounds and Alloys with Positron Annihilation Spectroscopy: Challenges and Opportunities

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