Characterizing heavy ions-irradiated Zr/Nb: Structure and mechanical properties

Daghbouj, N.; Sen, H.S.; Čı́žek, Jakub; Lörinčı́k, Jan; Karlı́k, Miroslav; Callisti, M.; Čech, Jaroslav; Havránek, V.; Li, B.; Kršjak, Vladimír; Liedke, Maciej Oskar; Butterilng, Maciej; Wagner, Andreas; Polcar, Tomáš

doi:10.1016/j.matdes.2022.110732

Cited by 37 publications

(27 citation statements)

References 87 publications

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“…After irradiation, the reflections in the Nb–Zr alloy were shifted towards larger angles, indicating an out-of-plane compressive strain [ 18 ]. It can be concluded that after irradiation, the system tends to relax, i.e., the atomic planes tend to move to be similar to Nb; a similar behavior was observed after Cu irradiation of Zr/Nb [ 6 , 17 ]. In the zone of primary knocked-out atoms, there was a depletion of zirconium and niobium atoms and an enrichment of iron ions, i.e., radiation-induced segregation occurs in the region of the solid solution Fe in the Nb–Zr alloy.…”

Section: Resultsmentioning

confidence: 83%

“…Zr–2.5Nb alloys are used in pressurized water reactors (PWRs) and boiling water reactors (BWRs); Zr–2Nb alloys are utilized in CANDU reactors; and Zr–3Nb alloys are used in research reactors. Zr–Nb alloys are also used as cladding materials for light water reactors (LWRs) [ 6 ]. Nb–Zr alloys with a Nb content of up to 10 wt% have demonstrated excellent properties, mainly resistance to corrosion and creeping under irradiation [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…One of the requirements for structural materials is radiation resistance, which is closely related to their mechanical properties. It was shown in [ 6 , 17 , 18 , 19 , 20 , 21 ] that ion implantation of a wide range of atomic ions in charged particle accelerators is a convenient method to investigate the radiation resistance of materials using neutron irradiation simulations. It is known that ion implantation can produce compounds that are not present in equilibrium state diagrams.…”

Section: Introductionmentioning

confidence: 99%

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Mössbauer and X-ray Studies of Radiation-Induced Processes in Nb–Zr Alloys Implanted with 57Fe Ions

2023

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The effect of implanting 57Fe ions on the crystal structure of Nb–Zr alloys has been studied using Mössbauer spectroscopy on 57Fe nuclei and X-ray diffraction. As a result of implantation, a metastable structure was formed in the Nb–Zr alloy. The XRD data indicated a decrease in the crystal lattice parameter of niobium; that is, there was a compression of the niobium planes when implanted with iron ions. Mössbauer spectroscopy revealed three states of iron. The singlet indicated a supersaturated Nb(Fe) solid solution; the doublets characterized the diffusion migration of atomic planes and crystallization of voids. It was shown that the values of the isomer shifts in all three states did not depend on the implantation energy, which indicates the invariance of the electron density on the 57Fe nuclei in the studied samples. The resonance lines of the Mössbauer spectra were significantly broadened, which is typical for materials with low crystallinity and a metastable structure that is stable at room temperature. The paper discusses the mechanism of radiation-induced and thermal transformations in the Nb–Zr alloy, which leads to the formation of a stable well-crystallized structure. A Fe2Nb intermetallic compound and the Nb(Fe) solid solution formed in its near-surface layer, while Nb(Zr) remained in the bulk.

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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mössbauer and X-ray Studies of Radiation-Induced Processes in Nb–Zr Alloys Implanted with 57Fe Ions

2023

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“…Однако, границы зерен являются не стабильными стоками для дефектов, при интенсивном радиационном воздействии и высоких температурах возможен процесс рекристаллизации и уменьшение их объемной плотности. С данной точки зрения более стабильны гетерогенные структуры, такие как наноразмерные многослойные металлические системы [3,4]. Особый интерес представляют Zr/Nb системы, ввиду низких сечений захвата нейтронов, хороших механических и коррозионных качеств, положительной энтальпии смешивания -4 КДж/моль, что должно обеспечивать высокую структурную стабильность при интенсивных радиационных воздействиях с высокими дозами облучения.…”

Section: национальный исследовательский томский политехнический униве...unclassified

STRUCTURAL CHANGES IN NANOSIZED Zr/Nb COATINGS UNDER INTENSE EXPOSURE TO HELIUM IONS

Krotkevich¹,

Lomygin²

2022

Physical Mesomechanics of Materials. Physical Principles of Multi-Layer Structure Forming and Mechanisms of Non-Linear Behavior

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“…Zirconium and niobium can form various types of interfaces due to the different crystal lattices (hcp and bcc) and positive mixing enthalpy (4 kJ/mol) [ 16 ]. The high radiation tolerance of nanoscale multilayer Zr/Nb systems has been demonstrated in recent studies, including helium ion irradiation [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Helium atoms are produced in materials as a result of nuclear reactions (n, α) [ 26 ] and tend to accumulate in vacancies and interstitials with the formation of helium bubbles, leading to changes in the macroscopic properties of the irradiated material [ 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Features of Helium–Vacancy Complex Formation at the Zr/Nb Interface

Svyatkin

Laptev

2023

Materials

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A first-principles study of the atomic structure and electron density distribution at the Zr/Nb interface under the influence of helium impurities and helium–vacancy complexes was performed using the optimised Vanderbilt pseudopotential method. For the determination of the preferred positions of the helium atom, the vacancy and the helium–vacancy complex at the interface, the formation energy of the Zr-Nb-He system has been calculated. The preferred positions of the helium atoms are in the first two atomic layers of Zr at the interface, where helium–vacancy complexes form. This leads to a noticeable increase in the size of the reduced electron density areas induced by vacancies in the first Zr layers at the interface. The formation of the helium–vacancy complex reduces the size of the reduced electron density areas in the third Zr and Nb layers as well as in the Zr and Nb bulk. Vacancies in the first niobium layer near the interface attract the nearest zirconium atoms and partially replenish the electron density. This may indicate a possible self-healing of this type of defect.

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Characterizing heavy ions-irradiated Zr/Nb: Structure and mechanical properties

Cited by 37 publications

References 87 publications

Mössbauer and X-ray Studies of Radiation-Induced Processes in Nb–Zr Alloys Implanted with 57Fe Ions

Mössbauer and X-ray Studies of Radiation-Induced Processes in Nb–Zr Alloys Implanted with 57Fe Ions

STRUCTURAL CHANGES IN NANOSIZED Zr/Nb COATINGS UNDER INTENSE EXPOSURE TO HELIUM IONS

Features of Helium–Vacancy Complex Formation at the Zr/Nb Interface

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