Nitrogen diffusion enhancement in a ferrous alloy by deuterium isotopic effect

Studies of nitrogen implantation in an iron alloy using photoemission electron spectroscopy, sputtered neutral mass spectrometry, and elastic recoil detection analysis, reveal an enhancement of nitrogen diffusion when deuterium replaces hydrogen in the gas. Compared to hydrogen, deuterium reduces NOx species on the surface (geometric barrier), increasing the nitrogen activity at the surface and consequently nitrogen diffusion into the solid solution. (c) 2007 American Institute of Physics.1011

MOSSBAUER STUDY OF HYDROGENATED AMORPHOUS GERMANIUM-TIN THIN-FILM ALLOYS

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Microstructure and corrosion behaviour of pulsed plasma-nitrided AISI H13 tool steel

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)The effect of pulsed plasma nitriding temperature and time on the pitting corrosion behaviour of AISI H13 tool steel in 0.9% NaCl solutions was investigated by cyclic polarization. The pitting potential (E(pit)) was found to be dependent on the composition, microstructure and morphology of the surface layers, whose properties were determined by X-ray diffraction and scanning electron microscopy techniques. The best corrosion protection was observed for samples nitrided at 480 degrees C and 520 degrees C. Under such experimental conditions the E(pit)-values shifted up to 1.25 V in the positive direction. (C) 2010 Elsevier Ltd. All rights reserved.52931333139UCSConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP

Parameter Induced Changes in the Wear Behavior of Ion Implanted Steel under Heavy Loading

Lubricated sliding wear studies on nitrogen implanted steel are reported. Wear tests were made using the cylinder in V-groove geometry and heavy loading provided by a modified Falex test machine. A series of four tests were made to assess the effect of implanting various combinations of the two members of the wearing couple. Results indicated that implantation of the V-blocks had little effect on the wear rates of either member of the wear couple. However, implantation of the pin caused a large improvement (10) in the wear rate of the pin, but had little effect on the wear rate of the blocks. When these results are compared with those from other lubricated sliding studies on nitrogen implanted steels, it appears that implantations are most effective when the rotating member of the wear couple which experiences cyclic wear is implanted and of little effect when the stationary member which experiences continuous wear is implanted. Both silicon and tin implantations were also able to significantly improve the wear rate of the pin. The dose required for both elements was less than those of nitrogen with an order of magnitue less dose needed for tin. Some Auger data on the unworn and worn samples is also presented. Both the dose data and the Auger data can be used to support an oxidative wear model. (A