Ion implantation and annealing of crystalline oxides and ceramic materials

White, C.W.; Boatner, L. A.; Sklad, P.S.; McHargue, C.J.; Rankin, Janet; Farlow, G. C.; Aziz, Michael J.

doi:10.1016/0168-583x(88)90172-3

Cited by 115 publications

(32 citation statements)

References 25 publications

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“…This readily accounts for the constancy of the radial recrystallization velocity, and it is in accordance with more general formulations of solidstate epitaxy or epitaxial regrowth such as the KolmogorovJohnson-Mell-Avrami (KJMA) model [47,48]. The linear boundary motion or constant recrystallization rate has also been invoked in the annealing of ion-beam irradiated ABO3 oxides [30][31][32][33][34], mostly for the elastic nuclear collision regime.…”

Section: Physical Mechanismsmentioning

confidence: 66%

“…In particular, we can compare our data with those obtained [30] in some perovskites after 0.5 MeV irradiation with Pb. They clearly show by monitoring the recovery with RBS/C that amorphous regions recrystallize epitaxially with motion of the boundary toward the surface.…”

Section: Comparison With the Recrystauization Of Amorphous Layers Genmentioning

confidence: 87%

“…In relation to our work, one should pay special attention to extensive work on perovskites and related oxides, using both, light and heavy ions, mostly for applications to the storage and immobilization of radioactive waste [30][31][32][33][34]. The study has concentrated on the nuclear stopping regime or a mixed regime with a substantial contribution of nuclear collisions to the ion losses.…”

Section: Comparison With the Recrystauization Of Amorphous Layers Genmentioning

confidence: 99%

“…So far, most information concerning annealing of radiation damage in oxides has been performed in the cases where nuclear mechanisms are dominant (nuclear collision regime) or there is a severe mixing of both electronic and nuclear mechanisms [30][31][32][33][34]. The study presented in this paper has, first, a basic interest in order to get a deeper insight into the annealing behavior of the amorphous regions generated by electronic excitation (electronic excitation regime).…”

Section: Introductionmentioning

confidence: 99%

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Recrystallization of amorphous nanotracks and uniform layers generated by swift-ion-beam irradiation in lithium niobate

et al. 2011

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The thermal annealing of amorphous tracks of nanometer-size diameter generated in lithium niobate (LiNbOs) by Bromine ions at 45 MeV, i.e., in the electronic stopping regime, has been investigated by RBS/C spectrometry in the temperature range from 250°C to 350°C. Relatively low fluences have been used (<10 12 cm -2 ) to produce isolated tracks. However, the possible effect of track overlapping has been investigated by varying the fluence between 3 x 10 11 cm -2 and 10 12 cm -2 . The annealing process follows a two-step kinetics. In a first stage (I) the track radius decreases linearly with the annealing time. It obeys an Arrhenius-type dependence on annealing temperature with activation energy around 1.5 eV. The second stage (II) operates after the track radius has decreased down to around 2.5 nm and shows a much lower radial velocity. The data for stage I appear consistent with a solid-phase epitaxial process that yields a constant recrystallization rate at the amorphouscrystalline boundary. HRTEM has been used to monitor the existence and the size of the annealed isolated tracks in the second stage. On the other hand, the thermal annealing of homogeneous (buried) amorphous layers has been investigated within the same temperature range, on samples irradiated with Fluorine at 20 MeV and fluences of ~10 14 cm -2 . Optical techniques are very suitable for this case and have been used to monitor the recrystallization of the layers. The annealing process induces a displacement of the crystallineamorphous boundary that is also linear with annealing time, and the recrystallization rates are consistent with those measured for tracks. The comparison of these data with those previously obtained for the heavily damaged (amorphous) layers produced by elastic nuclear collisions is summarily discussed.

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Section: Physical Mechanismsmentioning

confidence: 66%

Section: Comparison With the Recrystauization Of Amorphous Layers Genmentioning

confidence: 87%

Section: Comparison With the Recrystauization Of Amorphous Layers Genmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recrystallization of amorphous nanotracks and uniform layers generated by swift-ion-beam irradiation in lithium niobate

et al. 2011

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“…7a) at cutting speed of 50 m/min. The c-alumina is a low-temperature modification of a-alumina ( Ref 11,12) and its formation indicates that the actual temperatures in the cutting zone are around 750-800°C. However c-alumina has similar characteristics to the a-alumina and has a similar effect on the surface integrity of the machined part.…”

Section: Surface Integrity Studiesmentioning

confidence: 99%

Investigations of White Layer Formation During Machining of Powder Metallurgical Ni-Based ME 16 Superalloy

Veldhuis

Dosbaeva

Elfizy³

et al. 2009

J. of Materi Eng and Perform

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Surface integrity of machined parts made from the advanced Ni-based superalloys is important for modern manufacturing in the aerospace industry. Metallographic observations of the ME 16 alloy microstructure were made using optical metallography and a high-resolution scanning electron microscope with energy dispersive x-ray spectrometer (HR SEM/EDS). Tool life of cemented carbide inserts with TiAlN coating during machining (finishing turning operation) of ME 16 superalloy has been studied and wear patterns of the cutting tools were identified. Surface integrity of the machined part after completion of the turning operation was investigated. The morphology of machined parts has been examined and cross-sections of the machined surfaces have been analyzed. The formation of white layer on the surface of the machined part was studied for varied machining conditions. It was found that a 2-4 lm thick white layer forms during turning of the ME 16 superalloy. This layer was investigated using EDS and XRD. The studies show that the white layer is an oxygen-containing layer with a high amount of aluminum, enriched by chromium and tungsten. Under specific cutting conditions, the structure of white layer transforms into a c-alumina. Formation of this thermal barrier ceramic white layer on the surface of the machined part negatively affects its surface integrity and cutting tool life.

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Epitaxial Phase Transformations in Aluminum Oxide

Clarke

1998

phys. stat. sol. (a)

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Amorphous alumina, deposited on sapphire at room temperature, transforms by epitaxial regrowth to γ‐alumina and then to α‐alumina on heating. The use of time‐resolved reflectivity of a laser beam to measure the transformation kinetics in‐situ is described and the kinetics obtained to date as a function of crystallographic orientation are reviewed as well as the effect of Cr3+ and Fe3+ dopants. A number of the characteristic features of the epitaxial transformations are described in terms of an interfacial dislocation model.

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Ion implantation and annealing of crystalline oxides and ceramic materials

Cited by 115 publications

References 25 publications

Recrystallization of amorphous nanotracks and uniform layers generated by swift-ion-beam irradiation in lithium niobate

Recrystallization of amorphous nanotracks and uniform layers generated by swift-ion-beam irradiation in lithium niobate

Investigations of White Layer Formation During Machining of Powder Metallurgical Ni-Based ME 16 Superalloy

Epitaxial Phase Transformations in Aluminum Oxide

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