Effect of dose and post irradiation annealing in Ni implanted high entropy alloy FeCrCoNi using slow positron beam

Abhaya, S.; Rajaraman, R.; Kalavathi, S.; David, C.; Panigrahi, B. K.; Amarendra, G.

doi:10.1016/j.jallcom.2016.01.242

Cited by 23 publications

(13 citation statements)

References 19 publications

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“…The decreased defect size from pure Ni has also been observed using diffuse X-ray scatterings, even for NiCo as the closest case: the averaged size is reduced from 6.8 to 4.6 nm and from 2.3 to 1.5 nm for interstitial and vacancy type defects, respectively . Moreover, the presence of monovacancies has been reported, through positron annihilation experiments, in NiCoFeCr under Ni ion irradiations even to a high dose of ∼100 dpa (Abhaya et al, 2016).…”

Section: Response To the Irradiation At Room And Low Temperaturesmentioning

confidence: 95%

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Single-Phase Concentrated Solid-Solution Alloys: Bridging Intrinsic Transport Properties and Irradiation Resistance

Jin

Bei

2018

Front. Mater.

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Single-phase concentrated solid-solution alloys (SP-CSAs), including high entropy alloys (HEAs), are compositionally complex but structurally simple, and provide a playground of tailoring material properties through modifying their compositional complexity. The recent progress in understanding the compositional effects on the energy and mass transport properties in a series of face-centered-cubic SP-CSAs is the focus of this review. Relatively low electrical and thermal conductivities, as well as small separations between the interstitial and vacancy migration barriers have been generally observed, but largely depend on the alloying constituents. We further discuss the impact of such intrinsic transport properties on their irradiation response; the linkage to the delayed damage accumulation, slow defect aggregation, and suppressed irradiation induced swelling and segregation has been presented. We emphasize that the number of alloying elements may not be a critical factor on both transport properties and the defect behaviors under ion irradiations. The recent findings have stimulated novel concepts in the design of new radiation-tolerant materials, but further studies are demanded to enable predictive models that can quantitatively bridge the transport properties to the radiation damage.

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Section: Response To the Irradiation At Room And Low Temperaturesmentioning

confidence: 95%

“…The phase stability of FCC SP-CSAs at room temperature has been examined in both NiCoFeCr (Abhaya et al, 2016) and NiCoFeCrAl 0.1 (Xia et al, 2016) under high dose irradiations up to ∼100 dpa. No observable secondary phase was observed in both studies.…”

Section: Response To the Irradiation At Room And Low Temperaturesmentioning

confidence: 99%

Single-Phase Concentrated Solid-Solution Alloys: Bridging Intrinsic Transport Properties and Irradiation Resistance

Jin

Bei

2018

Front. Mater.

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“…Ab initio theory, time-dependent density functional theory (TD-DFT), AIMD, and classical MD simulations have revealed how alloy complexity can alter energy dissipation (the first distinctive property described in Section 3A) in the electronic and atomic subsystems [48][49][50][51], thereby offering the possibility of enhanced defect recombination or self-healing radiation resistance. Increasing experimental activities are evident in recent literatures [2,[12][13][14]23], including the successful growth of large single crystals, the integrated experiments and modeling predictions [2,12,13,[52][53][54][55][56][57], and the collaborative execution of well-defined irradiation experiments and microstructural characterization to evaluate compositional effects on radiation response [12][13][14]17,23,[55][56][57][58][59].…”

Section: B Defect Production and Damage Accumulationmentioning

confidence: 99%

Atomic-level heterogeneity and defect dynamics in concentrated solid-solution alloys

Zhang

Zhao

Weber

et al. 2017

Current Opinion in Solid State and Materials Science

168

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Performance enhancement of structural materials in extreme radiation environments has been actively investigated for many decades. Traditional alloys, such as steel, brass and aluminum alloys, normally contain one or two principal element(s) with a low concentration of other elementals. While these exist in either a mixture of metallic phases (multiple phases) or solid solution (single phase), limited or localized chemical disorder is a common characteristic of the main matrix. In sharp contrast to the traditional alloys, recently developed single-phase concentrated solid so lution alloys (CSAs) contain multiple elemental species in equiatomic or high concentrations with different elements randomly arranged on a crystalline lattice. Due to the lack of elemental predictability in these CSAs, they exhibit significant chemical disorders and unique site-to-site lattice distortions. While it has long been recognized that specific compositions of traditional alloys have enhanced radiation resistance, it remains unclear how the atomic-level heterogeneity affects defect formation, damage accumulation, and microstructural evolution. Such knowledge gaps have been a roadblock to future-generation energy technology. CSAs with a simple crystal structure, but complex chemical disorder are ideal systems to understand how compositional complexity influences defect dynamics, and to fill the knowledge gaps with focus on electronic-and atomic-level interactions, mass and energy transfer processes, and radiation resistance performance. Recent advances of defect dynamics and irradiation performance of CSAs are reviewed, intrinsic chemical effects on radiation performance are discussed, and future directions are suggested.

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“…Positron annihilation spectroscopy (PAS) is an unique and sensitive probe to lattice defects with limited concentration 24,25 . Earlier work with PAS on single phase fcc HEA 8 and concentrated solid solution alloys 26,27 highlights the importance of performing systematic studies with several irradiation doses and alloy composition. In this work, we employed positron annihilation spectroscopy to characterize the microstructural evolution through vacancy-type defects in the irradiated samples.…”

Section: Positron Annihilation Spectroscopymentioning

confidence: 99%

Effect of interstitial carbon on the evolution of early-stage irradiation damage in equi-atomic FeMnNiCoCr high-entropy alloys

Makkonen

Mizohata

et al. 2020

Journal of Applied Physics

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Owing to their excellent radiation tolerance, some of the high-entropy alloys (HEAs) are considered as potential candidates for structural materials in extreme conditions. In order to shed light on the early-stage irradiation damage in HEAs, we performed positron annihilation spectroscopy on hydrogen implanted equi-atomic FeMnNiCoCr and interstitial carbon-containing FeMnNiCoCr HEAs. We reveal primary damage as mono-vacancies in low dose irradiated HEAs. The enhancement of Frenkel pair recombination by C addition is observed in C-containing HEAs. In addition, the C interstitials suppress the vacancy cluster formation in high dose irradiated HEAs.

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Effect of dose and post irradiation annealing in Ni implanted high entropy alloy FeCrCoNi using slow positron beam

Cited by 23 publications

References 19 publications

Single-Phase Concentrated Solid-Solution Alloys: Bridging Intrinsic Transport Properties and Irradiation Resistance

Single-Phase Concentrated Solid-Solution Alloys: Bridging Intrinsic Transport Properties and Irradiation Resistance

Atomic-level heterogeneity and defect dynamics in concentrated solid-solution alloys

Effect of interstitial carbon on the evolution of early-stage irradiation damage in equi-atomic FeMnNiCoCr high-entropy alloys

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