Radiation-assisted chemical short-range order formation in high-entropy alloys

Su, Zhengxiong; Shi, Tan; Shen, Huahai; Jiang, Li; Wu, Lu; Song, Miao; Li, Zhiming; Wang, Sheng; Lu, Chenyang

doi:10.1016/j.scriptamat.2022.114547

Cited by 39 publications

(8 citation statements)

References 34 publications

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“…S2 A , we show that a certain degree of LCO develops during PKA in the RSS, which can be attributed to the fact that the thermally activated local atomic arrangements always tend toward a lower free-energy state, i.e., atomic configurations with a higher degree of CSRO (see, e.g., ref. 37 ). Correspondingly, the LCO would not be much decreased during PKA either ( SI Appendix , Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of local chemical order on the irradiation-induced defect evolution in CrCoNi medium-entropy alloy

Zhang

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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High- (and medium-) entropy alloys have emerged as potentially suitable structural materials for nuclear applications, particularly as they appear to show promising irradiation resistance. Recent studies have provided evidence of the presence of local chemical order (LCO) as a salient feature of these complex concentrated solid-solution alloys. However, the influence of such LCO on their irradiation response has remained uncertain thus far. In this work, we combine ion irradiation experiments with large-scale atomistic simulations to reveal that the presence of chemical short-range order, developed as an early stage of LCO, slows down the formation and evolution of point defects in the equiatomic medium-entropy alloy CrCoNi during irradiation. In particular, the irradiation-induced vacancies and interstitials exhibit a smaller difference in their mobility, arising from a stronger effect of LCO in localizing interstitial diffusion. This effect promotes their recombination as the LCO serves to tune the migration energy barriers of these point defects, thereby delaying the initiation of damage. These findings imply that local chemical ordering may provide a variable in the design space to enhance the resistance of multi-principal element alloys to irradiation damage.

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Section: Resultsmentioning

confidence: 99%

Effect of local chemical order on the irradiation-induced defect evolution in CrCoNi medium-entropy alloy

Zhang

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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“…High‐entropy alloys (HEAs), also called as multiprincipal elements alloys (MPEAs), are a new type of materials that break through the traditional alloy design paradigm based on single principal element. Thanks to four core effects, HEAs not only greatly expand the design range of alloys, but also exhibit many remarkable performances, such as high strength, [ 5 ] good toughness, [ 6 ] outstanding wear, [ 7 ] radiation, [ 8 ] corrosion, [ 9 ] and oxidation resistance. [ 10 ] As a result, the concept of HEAs provides a possibility to achieve the mechanical performance–corrosion resistance synergy in metallic materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al Content on Microstructure, Mechanical, and Corrosion Properties of (Fe₃₃Cr₃₆Ni₁₅Co₁₅Ti₁)_100−xAl_x High‐Entropy Alloys

Zheng,

Lu,

Han

et al. 2023

Adv Eng Mater

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(Fe33Cr36Ni15Co15Ti1)100−x Al x (x=0, 3, 5, 6, 7, 8) high entropy alloys (HEAs) were prepared by arc‐melting. The influence of Al element addition on the microstructure, mechanical properties, and anti‐corrosion in 3.5 wt.% NaCl aqueous solution was systematically investigated. The microstructure analysis indicated that HEAs possessed varying phases from FCC+Sigma to FCC+BCC and then FCC+BCC+Sigma, the last to BCC+Sigma with the increase of Al content. The compressive results suggested that the Al addition exhibited a significant elevation in strength. Particularly, Al7 alloy performed a superior strength and plasticity, which presented a yield strength of 1315.3 MPa and a compressive strain over 50%. Order strengthening and coherent strengthening of nanosized phase were regarded as main strengthening effects. In addition, Al element was harmful for the corrosion resistance (Epit and Icorr) of (Fe33Cr36Ni15Co15Ti1)100−x Al x HEAs system, which was ascribed to the weakened passive film stability. It was also noted that pits tended to be initiated in relatively Cr‐depleted phases (FCC or B2 phase) due to the inhomogeneous elemental distribution induced galvanic corrosion. In spite of this, all HEAs exhibit superior corrosion resistance than that of 304SS. This work provides a beneficial guidance for alloy design simultaneously regarding strength, ductility, and corrosion.This article is protected by copyright. All rights reserved.

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“…Thermodynamically, CSRO is enhanced by atom diffusion, which is a thermally slow process due to a low concentration of defects. By contrast, radiationenhanced diffusion can promote an efficient increase of CSRO [4,6,19] over the timescale of radiation experiments. However, how the CSRO correlates with radiation dose and the existence of steady-state CSRO remain to be elaborated.…”

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confidence: 96%

“…and NiCoFeCrMn [6] where CSRO is enhanced by increasing the irradiation dose and temperature. Combining these two, it is projected that the initial CSRO level, dose rate, and temperature determine the evolving trend of CSRO.…”

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confidence: 99%

“…Due to the perturbations of electronic structure and phonon spectrum of the constituent species, the atomic configuration exhibits some atomic correlations that can be described as CSRO [2,4,5]. CSRO has been used to explain the increased mechanical characteristics in various alloys [2,[5][6][7][8]. The degree of CSRO may be tailored to achieve an optimized combination of strength, ductility, and toughness via control of composition and thermoprocessing parameters [5,8,9].…”

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Impact of chemical short-range order on radiation damage in Fe-Ni-Cr alloys

Hamdy¹,

Jin²

2023

Preprint

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Chemical short-range order (CSRO), a form of nanoscale special atom arrangement, has been found to significantly alter material properties such as dislocation motion and defect dynamics in various alloys. Here, we use Fe-Ni-Cr alloys to demonstrate how CSRO affects defect properties and radiation behavior, based on extensive molecular dynamics simulations. Statistically significant results are obtained regarding radiation-induced defect propensity, defect clustering, and chemical mixing as a function of dose for three CSRO levels. The perfect random solution as an energetically unfavorable state (negative stacking fault energy) shows the strongest tendency to enable diffusion, while a high CSRO degree scenario generally reduces the effective defect diffusivity due to trapping effects, leading to distinct defect dynamics. Notably, in the high-CSRO scenario, interstitial clusters are Cr-rich and interstitial loops preferentially reside in/near the Cr-rich CSRO domains. It is also identified that CSRO is dynamically evolving in a decreasing or increasing manner upon continuous irradiation, reaching a steady-state value. These new understandings suggest the importance of incorporating the effect of CSRO in investigating radiation-driven microstructural evolution.

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Radiation-assisted chemical short-range order formation in high-entropy alloys

Cited by 39 publications

References 34 publications

Effect of local chemical order on the irradiation-induced defect evolution in CrCoNi medium-entropy alloy

Effect of local chemical order on the irradiation-induced defect evolution in CrCoNi medium-entropy alloy

Effect of Al Content on Microstructure, Mechanical, and Corrosion Properties of (Fe₃₃Cr₃₆Ni₁₅Co₁₅Ti₁)_100−xAl_x High‐Entropy Alloys

Impact of chemical short-range order on radiation damage in Fe-Ni-Cr alloys

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Radiation-assisted chemical short-range order formation in high-entropy alloys

Cited by 39 publications

References 34 publications

Effect of local chemical order on the irradiation-induced defect evolution in CrCoNi medium-entropy alloy

Effect of local chemical order on the irradiation-induced defect evolution in CrCoNi medium-entropy alloy

Effect of Al Content on Microstructure, Mechanical, and Corrosion Properties of (Fe33Cr36Ni15Co15Ti1)100−xAlx High‐Entropy Alloys

Impact of chemical short-range order on radiation damage in Fe-Ni-Cr alloys

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Effect of Al Content on Microstructure, Mechanical, and Corrosion Properties of (Fe₃₃Cr₃₆Ni₁₅Co₁₅Ti₁)_100−xAl_x High‐Entropy Alloys