High dislocation density structures and hardening produced by high fluency pulsed-ion-beam implantation

Sharkeev, Yu. P.; Didenko, A. N.; Козлов, Э. В.

doi:10.1016/s0257-8972(94)80016-2

Cited by 74 publications

(17 citation statements)

References 14 publications

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“…The increase in hardness can be attributed to conventional radiation induced effects such as dislocation hardening. 11,17 For series B, the indentation results reveal that the hardening effect (y10%) is found on the sample implanted with 1610 17 C z ions/cm 2 (sample B2). However, an increase in the carbon ion doses will lead to a significant decrease in hardness.…”

Section: Hardnessmentioning

confidence: 99%

Effects of carbon and nitrogen ion implantations on surface and tribological properties of Ti–Al–Si–N coatings

Shum

Zhou

et al. 2012

Surface Engineering

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The post-treatment of ion implantation on hard coatings attracts a great deal of attention because of the improvement in coating surface properties. The present research investigates the effect of nitrogen (N), carbon (C) and carbon followed with nitrogen (CzN) ion implantations on the structural and mechanical properties of the Ti-Al-Si-N coatings. Ion implantations were performed at an energy of 50 keV and different doses. The surface properties of the implanted layer were identified by a variety of analytic techniques, such as cross-sectional transmission electron microscopy, energy dispersive spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and nanoindentation measurement. Additionally, the wear performance of the samples was evaluated by a typical ball on disc tribometer in dry conditions. The results showed that the surface properties depended strongly on the implanted species and doses. In addition, a great improvement in the wear was observed on the samples with the post-treatment process of C and CzN ion implantations. ExperimentalTiAlSiN coatings with a typical thickness of 1?5 mm were deposited onto hardened M2 high speed steel and Si substrates by reactive close field unbalanced magnetron sputtering system (Teer UDP-450) with a high purity of Ti, Al and Si targets. In order to increase the adhesion of the coating, a Ti buffer layer was first deposited. By optimising the deposition conditions, TiAlSiN coatings [39 at-%Ti, 11 at-%Al, 4 at-%Si and 46 at-%N, determined by X-ray Department of Manufacturing Engineering and Engineering Management

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Section: Hardnessmentioning

confidence: 99%

Effects of carbon and nitrogen ion implantations on surface and tribological properties of Ti–Al–Si–N coatings

Shum

Zhou

et al. 2012

Surface Engineering

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“…It was demonstrated that the defects crucially affect the mechanical properties of the materials e.g. the hardness, which is influenced by defect aggregates serving as strong obstacles for dislocations [3][4][5][6]. Indentation tests allow hardness measurements of high local resolution and provide information about defect aggregates on the irradiated surface as well as in the bulk of the irradiated layer and our earlier works showed the interest to continue such studies [5,6].…”

Section: Introductionmentioning

confidence: 94%

Energy loss and fluence dependency of swift‐ion‐induced hardening in LiF

Manika

Maniks

Schwartz

et al. 2005

phys. stat. sol. (c)

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The depth profiles of the hardening effects of LiF irradiated with swift Au, Pb, Bi, Kr, Ni and S ions of MeV-GeV energy have been studied as a function of ion penetration depth. For all projectiles, the hardness increases scaling with the range of ions and depending on ion fluence and energy loss. Heavy ions (Au, Pb, Bi), for which the energy loss noticeably exceeds the threshold of about 10 keV/nm for severe track core damage, cause uniform increase of hardness in the entire irradiated layer. For irradiations with lighter S, Ni, Kr ions, the hardening displays strong depth dependence. Ion-induced hardening is related to pinning of dislocations by defect aggregates (possibly small Li colloids, vacancy clusters and bubbles of molecular fluorine) created along ion tracks or formed by saturation and aggregation of single defects when neighbour track overlapping occurs.

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“…Such an effect has been referred to as a "long-range effect" of ion implantation. 29 A region of twinned TiC has been found in the sample prepared using the sandwich technique (cf. Sec.…”

Section: B Microstructure As a Function Of Depthmentioning

confidence: 99%

Hardness–depth profile of a carbon-implanted Ti–6Al–4V alloy and its relation to composition and microstructure

et al. 2001

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The variation of mechanical properties (hardness, indentation modulus) within a carbon-implanted region of a Ti-6Al-4V alloy-about 350-nm thick-was, for the first time, related with the microstructure and the chemical composition with a depth accuracy as small as ±20 nm. Microstructure, chemical composition, and mechanical properties of the implanted alloy were determined using transmission electron microscopy, Auger electron spectroscopy, and nanoindentation, respectively. The microstructure within the implanted region contains TiC precipitates, the density of which changes with depth in accordance with the carbon content. The hardness depends on the precipitate density: the maximum hardness occurs at the depth where an almost continuous TiC layer had formed. The depth profiles of hardness and indentation modulus were measured using three different methods: the cross-section method (CSM); the constant-load method (CLM); and the load-variation method (LVM). Only the hardness-depth profile obtained using the CSM, in which the indentations are performed perpendicular to the hardness gradient on a cross section of the specimen, reflects the microstructural variations present in the implanted region.

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High dislocation density structures and hardening produced by high fluency pulsed-ion-beam implantation

Cited by 74 publications

References 14 publications

Effects of carbon and nitrogen ion implantations on surface and tribological properties of Ti–Al–Si–N coatings

Effects of carbon and nitrogen ion implantations on surface and tribological properties of Ti–Al–Si–N coatings

Energy loss and fluence dependency of swift‐ion‐induced hardening in LiF

Hardness–depth profile of a carbon-implanted Ti–6Al–4V alloy and its relation to composition and microstructure

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