Microstructure and corrosion characteristics of CrCuFeMoNi HEA coatings with different compositions in high-temperature and high-pressure water

Chen, Q S; Liu, C H; Long, Jianping; Wang, J; Zhang, R Q; Yang, Hong; Zhang, W; Yao, Fang; Zhang, Sha; Zhang, Q

doi:10.1088/2053-1591/ab19ed

Cited by 8 publications

(8 citation statements)

References 42 publications

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“…Furthermore, there were no spallation or cracks between the corrosion regions and the lower coatings, which ascribed to (a) the low residual stress and (b) the high adhesive strength of the scale to the lower coating. The thicknesses of corroded coatings increased due to the formation of oxidation products, which was in agreement with the results obtained by Chen et al after the corrosion of CrCuFeMoNi HEA coatings with different compositions [25]. Moreover, Figure 9h-l shows the cross-sectional EDS line scanning results of the coatings after corrosion.…”

Section: Autoclave Testsupporting

confidence: 90%

“…In recent years, medium-entropy alloys (MEAs) have attracted increasing research attention. It is usually composed of 2~4 main elements and its mixing entropy (∆S mix ) in the range of 0.69 R~1.61 R (R is the gas constant) [22][23][24][25]. As one kind of multi-principal element alloy with relatively few main elements and easily controlled chemical composition, it has ultra-high strength, high hardness, excellent corrosion resistance and super irradiation resistance, which is expected to be industrialized and applied in the field of nuclear materials [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Al Concentration on Microstructure and Properties of AlNbTiZr Medium-Entropy Alloy Coatings

et al. 2021

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The AlNbTiZr medium-entropy alloy (MEA) coatings with different Al contents were prepared on N36 zirconium alloy substrates by RF magnetron co-sputtering. The morphology, microstructure, mechanical properties, surface wettability and corrosion resistance of the AlNbTiZr MEA coatings were studied to evaluate the surface protection behavior of zirconium alloy cladding under operation conditions of a pressurized water reactor. The results showed that all the coatings were composite structures with amorphous and bcc-structured nanocrystals. With the increase of Al content, both the elastic modulus and hardness decreased first and then increased. The hydrophobicity of the coatings was enhanced compared with that of the substrate. The 10.2 at.% Al AlNbTiZr coating had the best corrosion resistance and the minimum oxygen penetration depth, which originated from the formation of a denser oxide layer consisting of Nb2Zr6O17 and ZrO2. This study provides an improved idea for the design and development of Al-containing MEA coating materials for accident tolerant fuel.

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Section: Autoclave Testsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effect of Al Concentration on Microstructure and Properties of AlNbTiZr Medium-Entropy Alloy Coatings

et al. 2021

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“…A useful lookup tool for the neutron scattering and capture cross sections for elements as a function of neutron energy is the TENDL nuclear data library [ 27 ]. A number of studies have used low neutron cross section elements to design HEAs for ATF cladding, either as bulk alloys [ 28 , 29 , 30 , 31 ] or as coatings for Zr alloys [ 32 , 33 , 34 , 35 , 36 ]. Preliminary results of the HEA coatings has suggested better wear and corrosion performance than uncoated Zr, and authors have claimed they are good candidates for ATF cladding [ 33 , 34 ].…”

Section: Desired Properties and Element Restrictionsmentioning

confidence: 99%

“…Preliminary results of the HEA coatings has suggested better wear and corrosion performance than uncoated Zr, and authors have claimed they are good candidates for ATF cladding [ 33 , 34 ]. However, HEAs have not been compared to other more conventional candidate coating systems, and the properties are very dependent on composition [ 36 ].…”

Section: Desired Properties and Element Restrictionsmentioning

confidence: 99%

High-Entropy Alloys for Advanced Nuclear Applications

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et al. 2021

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The expanded compositional freedom afforded by high-entropy alloys (HEAs) represents a unique opportunity for the design of alloys for advanced nuclear applications, in particular for applications where current engineering alloys fall short. This review assesses the work done to date in the field of HEAs for nuclear applications, provides critical insight into the conclusions drawn, and highlights possibilities and challenges for future study. It is found that our understanding of the irradiation responses of HEAs remains in its infancy, and much work is needed in order for our knowledge of any single HEA system to match our understanding of conventional alloys such as austenitic steels. A number of studies have suggested that HEAs possess ‘special’ irradiation damage resistance, although some of the proposed mechanisms, such as those based on sluggish diffusion and lattice distortion, remain somewhat unconvincing (certainly in terms of being universally applicable to all HEAs). Nevertheless, there may be some mechanisms and effects that are uniquely different in HEAs when compared to more conventional alloys, such as the effect that their poor thermal conductivities have on the displacement cascade. Furthermore, the opportunity to tune the compositions of HEAs over a large range to optimise particular irradiation responses could be very powerful, even if the design process remains challenging.

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“…The nuclear applications of MoNbTaTiW are also of interest due to the relatively low thermal neutron capture cross section of many of the constituent elements, and may therefore find applications as components in fusion or fission systems. For example, HEAs AlTiCrNiTa [26], CrCuFeMoNi [27], and AlCrMoNbZr [28] have been investigated as advanced technology fuel coatings for zirconium-based fuel rods.…”

Section: Introductionmentioning

confidence: 99%

Predicting the thermal expansion of body-centred cubic (BCC) high entropy alloys in the Mo–Nb–Ta–Ti–W system

et al. 2022

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In this study, the thermal expansion behaviour of equiatomic alloys in the Mo-Nb-Ta-Ti-W system is studied to provide a predictive method to assess the behaviour of this and other high entropy alloy systems. The simulations used are based on first principles density functional perturbation theory and the quasi-harmonic approximation. Calculations have been used to predict the stability and phonon properties of increasingly complex alloys in the Mo-Nb-Ta-Ti-W system and their thermal expansion coefficients have been predicted. These are benchmarked against rule of mixtures predictions and experimental observations where available. We have shown that atomic scale modelling techniques can be used to reliably predict thermal expansion of a range of BCC high entropy alloys and concentrated solid solutions of relevance to nuclear fusion and fission applications.

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Microstructure and corrosion characteristics of CrCuFeMoNi HEA coatings with different compositions in high-temperature and high-pressure water

Cited by 8 publications

References 42 publications

Effect of Al Concentration on Microstructure and Properties of AlNbTiZr Medium-Entropy Alloy Coatings

Effect of Al Concentration on Microstructure and Properties of AlNbTiZr Medium-Entropy Alloy Coatings

High-Entropy Alloys for Advanced Nuclear Applications

Predicting the thermal expansion of body-centred cubic (BCC) high entropy alloys in the Mo–Nb–Ta–Ti–W system

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