Interphase boundary layer-dominated strain mechanisms in Cu+ implanted Zr-Nb nanoscale multilayers

Daghbouj, N.; Callisti, M.; Sen, H.S.; Karlı́k, Miroslav; Čech, Jaroslav; Vronka, Marek; Havránek, V.; Čapek, Jiří; Minárik, Peter; Bábor, Petr; Polcar, Tomáš

doi:10.1016/j.actamat.2020.10.072

Cited by 38 publications

(22 citation statements)

References 48 publications

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“…The TG/DTG curves showed that the decrement in mass due to water evaporation for M/Cu2O (10.7%) and G/Cu2O (9.4%) was larger than in previously described experiments for HIXs with Cu 0 . This is in agreement with the FTIR analysis results for the examined materials, indicating that after the reduction of Cu2O to Cu 0 the area of the broad peak indicative of adsorbed water at 3350 cm −1 decreased and almost vanished in the case of G/Cu [33]. One of the causes of the higher hygroscopicity of M/Cu2O and G/Cu2O in comparison with M/Cu and G/Cu could be the presence of functional groups in the OH − form, which shows a very strong affinity for water [39].…”

Section: Scheme 1 Formation Of Inorganic Deposits In Examined Materisupporting

confidence: 91%

“…Since HIXs may contain a considerable amount of inorganic phase (which can exceed 30 wt%) [32], causing pore narrowing and blockage and grain deformation and cracking during drying and so hindering gaseous phase access to the inside of the ion exchanger, we proposed to subject also freeze-dried samples retaining their open internal structure (which they had in the aqueous phase, i.e., in the natural operating conditions) to thermal analysis [30]. A similar phenomenon may occur in the case of inorganic composite materials when Cu + ions penetrate inside the metal matrix, and the formation of Cu clusters causes a high strain of the host atoms [33].…”

Section: Introductionmentioning

confidence: 99%

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Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

2021

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Hybrid ion exchangers (HIXs) containing fine Cu2O and Cu0 particles were subjected to thermal analysis in order to determine their hygroscopic water content (with regard to their anomalously low porosity) and to determine the effect of the oxidation state of the copper atom in the deposit on the thermal properties of composite materials. Commercially available anion exchangers, Amberlite IRA 900Cl (macroreticular, M) and Amberlite IRA 402OH (gel-like, G), were used as supporting materials. M/Cu2O, G/Cu2O, M/Cu and G/Cu, containing 4.3–8.4 wt% Cu, were subjected to thermal analysis under respectively air and N2. TG/DTG curves revealed that dry M/Cu and G/Cu contained as little as 7.2% and 4.3% hygroscopic water, while M/Cu2O and G/Cu2O contained respectively 10.6% and 9.4% (Cu0 was a stronger water repellent than Cu2O). The oxidation state of the copper atom in the deposit was found to affect the amount of the forming char, and also Cu0 was found to contribute to the formation of more char than in the pyrolysis of the pure resin (the anion exchanger with no copper deposit). Under air the two kinds of particles transformed into CuO, while under N2 metallic copper and char (from the resin phase) made up the solid residue. This means that in the pyrolysis of the HIXs the inorganic phase participated in char formation and it also transformed itself (undergoing reduction when possible). The above findings provide a basis for in-depth research aimed at the innovative use of copper-containing HIXs and at obtaining usable composite materials with a designed (organic-inorganic) composition.

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Section: Scheme 1 Formation Of Inorganic Deposits In Examined Materisupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

2021

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“…Specifically, the radiation resistance of Zr/Nb NMCs is actively investigated. Research of irradiation of NMC Zr/Nb by Si + [26], C + [28], Cu + [29], and H + [15] ions also shows high radiation resistance of such nanocomposites. Thus, irradiation by H + ions largely imitates neutron irradiation making nanocomposite NMS Zr/Nb potential material of active zones of nuclear reactors.…”

Section: Introductionmentioning

confidence: 90%

“…Density functional theory (DFT) calculation can help analyze damaging mechanisms and strain distribution across Zr/Nb layers [15]. The incoherent Zr/Nb interfaces have been considered in [22,29], but there are no such calculations for the semi-coherent and coherent Zr/Nb interfaces. Establishing the relationship between the type of interface, diffusion, and localization characteristics of ions and defects is an intricate problem that requires concerted theoretical studies and experiments.…”

Section: Introductionmentioning

confidence: 99%

First-Principles Calculations and Experimental Study of H+-Irradiated Zr/Nb Nanoscale Multilayer System

Laptev

Svyatkin

Krotkevich

et al. 2021

Metals

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Nanoscale multilayer coating (NMC) based on Zr/Nb layers (100/100 nm) before and after H+ irradiation was investigated by combining experimental techniques with first-principles calculations. Detailed studies of structural and phase state and defect structure of Zr/Nb NMC were performed using methods of transmission electron microscopy, X-ray structural analysis, glow discharge optical emission spectrometry, and the Doppler broadening spectroscopy using variable energy positron beam. The first-principles calculations of binding energies for hydrogen in metal Zr/Nb layers was carried out by the pseudopotential method within the density functional theory framework. First-principles calculations and experimental data indicate the presence of macro- and microstrains predominantly in the zirconium layers of Zr/Nb NMC. The main feature of the studied Zr/Nb NMC is the predominant hydrogen localization in Zr layers near the interfaces. The annihilation of positrons is shown to occur mainly in the Zr layers in the vicinity of the interface.

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“…Misra et al [9] present a method of strengthening (the hardness increasing) multilayer composites by controlling the thickness of the individual layers. Daghbouj et al [10] describe the deformation reduction due to increased mobility of vacancies and interstitials in a multilayer metallic material.…”

Section: Introductionmentioning

confidence: 99%

Creation of wear-resistant layers on steels using TIG electric arc surface remelting process with applying CaCN2-based nitriding powder

Kováč¹,

Mikuš

Žarnovský³

et al. 2022

Preprint

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Tungsten inert gas (TIG) electric arc welding process was used for surface remelting of nitriding powder applied on selected steel grades. The influence of remelting on the chemical composition and microstructure changes in the remelted area of selected steels (25CrMo4, 30CrMoV9, 41CrAlMo7) with different content of nitride-forming elements (Al, V) was investigated to improve hardness and abrasion wear resistance. Nitriding powder Pulnierpulver based on calcium cyanamide (CaCN2) was used in remelting. Hardness measurements and determination of abrasive wear resistance on an abrasive cloth with Al2O3 particles were performed. The microstructures of the remelted layers, as well as the worn areas, were observed by SEM. The presence of nitrogen in the remelted layers was proved by EDX analysis. A significant increase of hardness and abrasive wear resistance was achieved up to a depth of 1–1.5 mm from the surface in the case of all steels through remelting process. These results obtained can be attributed to the significant effect of nitrogen on the hardenability increasing of remelted layers and alloying martensite with nitrogen. The most significant growths of both parameters investigated were achieved in 25CrMo4 steel, for which the most significant nitrogen enrichment was found. The presented process of TIG surface remelting with powders containing a particular element represents a cheap, affordable, and fast way of forming surface layers with improved hardness and wear resistance.

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Interphase boundary layer-dominated strain mechanisms in Cu+ implanted Zr-Nb nanoscale multilayers

Cited by 38 publications

References 48 publications

Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

First-Principles Calculations and Experimental Study of H+-Irradiated Zr/Nb Nanoscale Multilayer System

Creation of wear-resistant layers on steels using TIG electric arc surface remelting process with applying CaCN2-based nitriding powder

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