Effect of Irradiation Parameters on Nickel-Ion Damage in Nickel

Sprague, J.A.; Westmoreland, J.E.; Smidt, F.A.; Malmberg, P. R.

doi:10.1520/stp33711s

Cited by 5 publications

(4 citation statements)

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“…Figure The results of this study are consistent with some other ion and reactor studies [3,7,75]However, it should be noted that the swelling rates observed in this study are an order of magnitude lower than recent results in similar alloys from Garner [42] and Toloczko [16] despite the higher dpa levels reached, but Several possible sources for these differences include heat/heat treatment [15], ion or neutron irradiation technique, and sample characterization method. Finally, the ion irradiations in this study were raster scanned at high raster scan frequency, which has been shown to delay the onset of void nucleation [12,76] and microstructural evolution, but there is no evidence of a difference in the high damage void swelling rate.…”

Section: Effect Of the Combined Microstructure Treatmentssupporting

confidence: 91%

The co-evolution of microstructure features in self-ion irradiated HT9 at very high damage levels

Getto

VanCoevering

Was

2017

Journal of Nuclear Materials

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Understanding the void swelling and phase evolution of reactor structural materials at very high damage levels is essential to maintaining safety and longevity of components in Gen IV fast reactors. A combination of ion irradiation and modeling was utilized to understand the microstructure evolution of ferritic-martensitic alloy HT9 at high dpa. Self-ion irradiation experiments were performed on alloy HT9to determine the co-evolution of voids, dislocations and precipitates up to 650 dpa at 460°C. Modeling of microstructure evolution was conducted using the modified Radiation Induced Microstructure Evolution (RIME) model, which utilizes a mean field rate theory approach with grouped cluster dynamics.Irradiations were performed with 5 MeV raster-scanned Fe 2+ ions on samples pre-implanted with 10 atom parts per million He. The swelling, dislocation and precipitate evolution at very high dpa was determined using Analytical Electron Microscopy in Scanning Transmission Electron Microscopy (STEM) mode.Experimental results were then interpreted using the RIME model. A microstructure consisting only of dislocations and voids is insufficient to account for the swelling evolution observed experimentally at high damage levels in a complicated microstructure such as irradiated alloy HT9. G phase was found to have a minimal effect on either void or dislocation evolution. M 2 X plays two roles; a variable biased sink for defects, and as a vehicle for removal of carbon from solution, thus promoting void growth. When accounting for all microstructure interactions, swelling at high damage levels is a dynamic process that continues to respond to other changes in the microstructure as long as they occur.

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Section: Effect Of the Combined Microstructure Treatmentssupporting

confidence: 91%

The co-evolution of microstructure features in self-ion irradiated HT9 at very high damage levels

Getto

VanCoevering

Was

2017

Journal of Nuclear Materials

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“…As a result of the periodic nature of this process, a resonant diffusion enhancement under certain deposition conditions-in which the period between pulses matches with the relaxation times of the mobile species-can be expected. Similar resonant phenomena have been previously observed for growths from pulsed fluxes [45]. (c) A third option lies on the diffusion controlled by 'non-reactive' species (i.e., clusters and droplets [12,46]) weakly bonded to the film surface.…”

Section: Discussionsupporting

confidence: 61%

Growth kinetics of epitaxial Y-stabilized ZrO₂films deposited on InP

Vasco¹,

Zaldo²

2004

J. Phys.: Condens. Matter

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The nucleation and growth kinetics of Y-stabilized ZrO 2 (YSZ) films have been studied by atomic force microscopy, scanning electron microscopy and x-ray diffraction. The investigated films are cube-on-cube epitaxially deposited on annealed (100)InP by pulsed laser deposition (PLD) exhibiting a twodimensional growth habit in spite of the large system misfit (≈13% of tensile strain). Beyond the nucleation regime, the YSZ growth kinetics is analysed within the frame of the dynamic scaling theory. Such an analysis suggests the existence of a unique growth mechanism operating during a wide range of deposition times, i.e., 50-10 4 s. This mechanism corresponds to the diffusion ruled by the surface local curvature and limited by the irreversible aggregation to kinks. On the basis of the achieved results, models accounting for the surface diffusion enhancement induced by PLD are discussed.

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“…A few charged-particle bombardment experiments to explore pulsed irradiation effects have been reported. These have, however, used ê ither pure metals like Ni [1][2][3][4] and V [5] or simple alloys such as Fe-15Cr-25Ni [6] and Fe-17Cr-17Ni-2.5Mo [7,8] that do not exhibit phase instability under irradiation. The resulting effects of pulsing were generally found to be subtle, except for "special case" situations of very low damage plus high helium injection [5] or irradiations occurring close to the upper temperature limit for swelling [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of pulsed dual-ion irradiation on phase transformations and microstructure in Ti-modified austenitic alloy

Lee

Packan

Mansur

1983

Journal of Nuclear Materials

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The influence of pulsed 4 MeV Ni ion bombardment, with and without simultaneous helium injection, has been explored in a low swelling, Ti-' J modified austenitic stainless steel. Irradiations were carried out to 70 dpa at 950 K; the pulsing frequencies were either 60 s on/off or^ 1 s on/off. Compared to continuous irradiation, pulsing caused a decrease in the inter5titial loop diameter at 1 dpa, although at higher doses the overall dislocation density was not affected. Pulsing and helium both promoted the stability of MC precipitates and retarded the subsequent G phase formation; in some cases G-phase was suppressed and n phase formed instead. Small bubble-like cavities were observed to grow into large voids after steady dual beam irradiation to 70 dpa. However, this conversion was suppressed by pulsed irradiation to 70 dpa and furthermore the sizes of the small cavities were somewhat reduced. The results are explained in terms of current mechanistic understanding of mean point defect kinetics and the evolution of microstructure and microcoraposition during irradiation with superimposed annealing periods. Research sponsored by the Division of Materials Sciences, U. S. Department of Energy under contract W-7405-eng-26 with the Union,Carbide Corporation. NOTICE PORTIONS OF THIS REPORT ARE ILLEGIBLE. 8v «"p» n " °*«•»• """•• he iii i. i i n publisher or recipient actno»vl»c)9»» It das been reproduced from the best iMus.Go.«n m .nf,,,gnnoâ vailable copy to permit the broadest \"^".\T^o"ln''c7o''^'" possible availability.

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Effect of Irradiation Parameters on Nickel-Ion Damage in Nickel

Cited by 5 publications

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The co-evolution of microstructure features in self-ion irradiated HT9 at very high damage levels

The co-evolution of microstructure features in self-ion irradiated HT9 at very high damage levels

Growth kinetics of epitaxial Y-stabilized ZrO₂films deposited on InP

Effects of pulsed dual-ion irradiation on phase transformations and microstructure in Ti-modified austenitic alloy

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Effect of Irradiation Parameters on Nickel-Ion Damage in Nickel

Cited by 5 publications

References 0 publications

The co-evolution of microstructure features in self-ion irradiated HT9 at very high damage levels

The co-evolution of microstructure features in self-ion irradiated HT9 at very high damage levels

Growth kinetics of epitaxial Y-stabilized ZrO2films deposited on InP

Effects of pulsed dual-ion irradiation on phase transformations and microstructure in Ti-modified austenitic alloy

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Growth kinetics of epitaxial Y-stabilized ZrO₂films deposited on InP