Competing mechanisms on the strength of ion-irradiated Zr/Nb nanoscale multilayers: Interface strength versus radiation hardening

Callisti, M.; Karlı́k, Miroslav; Polcar, Tomáš

doi:10.1016/j.scriptamat.2018.03.039

Cited by 25 publications

(20 citation statements)

References 31 publications

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“…When the energy of positrons was sufficient to reach the third layer (over 13 keV), a drop in the S parameter could be observed. The depth resolution decreased with positron energy and was caused by comprehensive implantation profile, according to Equation (3). For energies higher than 15 keV due to poor resolution, the following layers could only be described by the mean S parameter.…”

Section: Resistivity Measurementsmentioning

confidence: 99%

“…Radiation-induced defects and the corresponding changes in mechanical properties in irradiated materials have been carefully studied in recent decades for various multilayer coatings [1][2][3][4][5][6][7]. These structures with various crystal structures are widely used as self-healing coatings in radiation point defects, where vacancies and interstitials can recombine [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Proton Irradiation on the Defect Evolution of Zr/Nb Nanoscale Multilayers

Laptev

Ломыгин

Krotkevich

et al. 2020

Metals

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Nanoscale multilayer coatings (NMCs) with different crystal structures are considered as capable of self-healing after radiation damage due to the recombination of vacancies and interstitials. This work is focused on a defect distribution study of NMCs based on Zr/Nb layers (25/25 nm and 100/100 nm) after proton irradiation. Coatings with a total thickness of 1.05 ± 0.05 µm were irradiated by 900-keV protons using a pelletron-type electrostatic accelerator with an ion current of 2 µA for durations of 60 min to 120 min. The influence of the irradiation effect was studied by X-ray diffraction analysis (XRD), glow discharge optical emission spectrometry (GD–OES), and Doppler broadening spectroscopy using a variable energy positron beam. The results obtained by these methods are compatible and indicate that defect concentration of Zr/Nb NMCs remains unchanged or slightly decreases with increasing irradiation time.

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Section: Resistivity Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Proton Irradiation on the Defect Evolution of Zr/Nb Nanoscale Multilayers

Laptev

Ломыгин

Krotkevich

et al. 2020

Metals

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“…Thin film materials have been used as functional devices in the applications of semi-conductors [2,8,9,10], metal hydrides [1,4,5,11,12,13], and solar cells [14,15], etc. It is more conducive to the combination of multiple functional materials to form multilayer film materials [16,17], which can not only realize the unique characteristics of each material, but also give play to the characteristics of new interface materials [18,19,20] and improve their comprehensive performance [19,20,21,22,23]. Therefore, the design and fabrication of new multilayer functional materials have attracted attention as hot issues in current research [23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thickness of Molybdenum Nano-Interlayer on Cohesion between Molybdenum/Titanium Multilayer Film and Silicon Substrate

et al. 2019

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Titanium (Ti) film has been used as a hydrogen storage material. The effect of the thickness of a molybdenum (Mo) nano-interlayer on the cohesive strength between a Mo/Ti multilayer film and a single crystal silicon (Si) substrate was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and nano-indenter. Four groups of Si/Mo/Ti multilayer films with different thicknesses of Mo and Ti films were fabricated. The XRD results showed that the introduction of the Mo layer suppressed the chemical reaction between the Ti film and Si substrate. The nano-indenter scratch results demonstrated that the cohesion between the Mo/Ti film and Si substrate decreased significantly with increasing Mo interlayer thickness. The XRD stress analysis indicated that the residual stress in the Si/Mo/Ti film was in-plane tensile stress which might be due to the lattice expansion at a high film growth temperature of 700 °C and the discrepancy of the thermal expansion coefficient between the Ti film and Si substrate. The tensile stress in the Si/Mo/Ti film decreased with increasing Mo interlayer thickness. During the cooling of the Si substrate, a greater decrease in tensile stress occurred for the thicker Mo interlayer sample, which became the driving force for reducing the cohesion between the Mo/Ti film and Si substrate. The results confirmed that the design of the Mo interlayer played an important role in the quality of the Ti film grown on Si substrate.

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“…In hopes of exploiting this nanostructure concept, several studies have considered interfacedominant Zr. For instance, two-phase Zr/Nb nanolayered composites have been made via magnetron sputtering [32][33][34][35] and accumulative roll bonding [36]. However, all the above techniques produce nearly 2D architecture of planar, stacked Zr/Nb layers, which renders their deformation response highly anisotropic.…”

mentioning

confidence: 99%

“…1(e)). The interface planes randomly oriented in the same colony and not stacked, in a planar arrangement as in the CL Zr-2.5Nb [32][33][34][35][36]. The α layers are shorter and thinner as well.…”

mentioning

confidence: 99%

Hierarchical 3D Nanolayered Duplex-Phase Zr with High Strength, Strain Hardening, and Ductility

2019

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Nanolayered, bimetallic composites are receiving increased attention due to an exceptional combination of strength and thermal stability not possible from their coarse-layered counterparts or constituents alone. Yet, due to their 2D planar, unidirectional arrangement, they are highly anisotropic, which results in limited strain hardening and ductility. Therefore, like many high-performance, ultra-strong materials of our time, they succumb to the usual strengthductility trade-offs. Here we present the formation of a novel hierarchical microstructure, comprised of crystals consisting of 3D nanolayered α/β-Zr networks. By direct comparison with coarse-layered material of the same chemistry, we show that the unusual hierarchical 3D structure gives rise to high strain hardening, high strength and high ductility. Using TEM analysis and hysteresis testing, we discovered that the 3D randomly oriented bi-phase boundaries result in progressively dispersive rather than localized slip with increasing strain. Dislocation activity in the α-Zr lamellae transitions from single slip to multi-slip and eventually to multimodal slip as strain increases. The diffusive slip promoting properties of 3D layered networks can potentially invoke simultaneous high strength, strain hardening, and ductility, reveals a new target in the microstructural design of high performance structural materials.

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Competing mechanisms on the strength of ion-irradiated Zr/Nb nanoscale multilayers: Interface strength versus radiation hardening

Cited by 25 publications

References 31 publications

Effect of Proton Irradiation on the Defect Evolution of Zr/Nb Nanoscale Multilayers

Effect of Proton Irradiation on the Defect Evolution of Zr/Nb Nanoscale Multilayers

Effect of Thickness of Molybdenum Nano-Interlayer on Cohesion between Molybdenum/Titanium Multilayer Film and Silicon Substrate

Hierarchical 3D Nanolayered Duplex-Phase Zr with High Strength, Strain Hardening, and Ductility

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