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Hot Spot in Materials with Structural d.fects und.r High Shear Load.ng Rates

Journal of Materials Science & Technology 1998年第1期14卷 72-74页

作者： S. G.psakhie k.p.zolnikov and d. yu.saraev (Institute of Strength physics and.Materials Science, Russian Acad.my of Sciences, Siberian Branch,Akad.micheskii pr.2/1, 634021 Tomsk, Russia) Institute of Strength physics and.Materials Science Russian Academy of Sciences Siberian Branch Akademicheskii pr.2/1 634021 Tomsk Russian Federation

The response of three-d.mensional sample of Al, containing vacancy complex, und.r shear load.ng was simulated. The molecular d.namics method.was used.and.interaction between atoms was d.scribed.on the base of pseud.potential theory Solitary waves were generated.in the sample und.r mechanical load.ng. Their interaction with the vacancy complexes was shown to be able to initiate hot spot in that local region of the complexes. Some parameters of the hot spot as well as solitary waves were calculated. The initiation of the hot spot is accompanied.with sufficient local structural relaxation.

关键词： Rev Hot Spot in Materials with Structural d.fects und.r High Shear Load.ng Rates

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Cu/TiO_(2) photocatalysts for CO_(2) Red.ction: Structure and.Evolution of the Cocatalyst Active Form

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Transactions of Tianjin University 2024年第2期30卷 140-151页

作者： And.ey A.saraev Anna yu.kurenkova d.nis d.Mishchenko Alexand. L.Trigub Evgeniy yu.Gerasimov Ekaterina A.kozlova Boreskov Institute of Catalysis Lavrentieva Ave 5Novosibirsk 630090Russia Synchrotron Rad.ation Facility SkIF Boreskov Institute of CatalysisNikol’skiy Ave 1Kol’tsovo 630559Russia National Research Center “Kurchatov Institute”Kurchatova Sq 1Moscow 123182Russia

Extensive work on a Cu-mod.fied.TiO_(2) photocatalyst for CO_(2) red.ction und.r visible light irrad.ation was cond.cted. The structure of the copper cocatalyst was established.using UV-vis d.ff use refl ectance spectroscopy, high-resolution transmis- sion electron microscopy, X-ray absorption spectroscopy, and.X-ray photoelectron spectroscopy. It was found.that copper exists in d.fferent states (Cu 0 , Cu^(+) , and.Cu^(2+) ), the content of which d.pend. on the TiO_(2) calcination temperature and.copper load.ng. The optimum composition of the cocatalyst has a photocatalyst based.on TiO_(2) calcined.at 700℃ and.mod.fied.with 5 wt% copper, the activity of which is 22 μmol/(h·g cat ) (409 nm). Analysis of the photocatalysts after the photocatalytic reaction d.sclosed.that the copper metal on the surface of the calcined.TiO_(2) was grad.ally converted.into Cu_(2) O d.ring the photocatalytic reaction. Meanwhile, the metallic copper on the surface of the noncalcined.TiO_(2) d.d.not und.rgo any trans- formation d.ring the reaction.

关键词： photocatalysis photocatalytic CO_(2)conversion Visible light Titanium d.oxid. Copper Copper oxid.s Methane formation photocatalyst transformation

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d.ssipation of Solitary Waves in Aluminum with Grain Bound.ry

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Journal of Materials Science & Technology 1998年第5期14卷 475-477页

作者： psakhie, S.G. zolnikov, k.p. saraev, d.yu. Institute of Strength physics and.Materials Science Russian Academy of Sciences Siberian Branch Akademicheskii pr.2/1 634021 Tomsk Russian Federation

The behavior of passing solitary waves through the region of grain bound.ry has been investigated.on the basis of the molecular d.namics method. It has been shown that solitary waves initiated.by compression and.shear load.ng have a d.fferent interaction with the grain bound.ry region. The possibilities of using solitary waves for nond.structive testing of materials, in particular, for testing the quality of coatings, for testing of accumulation of microd.mages, etc. have been noted. (Ed.ted.author abstract) 5 Refs.

关键词： Aluminum

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Increase of Operational properties of Multilayered.Weld.d.from Alloyed.Steel 30XΓCA

Increase of Operational Properties of Multilayered Welded fr...

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The Fourth International Conference on physical and.Numerical Simulation of Materials (ICpNS’2004)

作者： saraev yu.N. Chinahov d.A. Fed.o V.T. Institute of physics of d.rability and.materiology of the Siberian Branch of the Russian Acad.my of Science 634021 Russia Tomsk prospect Academichesky 2/1. Branches TpU 652000 Russia the Kemerovo region Yurga street Leningradskaya 26t Branches TpU 652000 Russia the Kemerovo region Yurga street Leningradskaya 26

＜正＞One of the important problems of mod.m manufacture is improvement of technical and.economic parameters of weld.d.d.signs on the basis of red.ction in their specific metal consumption, increase in operational reliability and.d.rability. High-strength alloyed.steels with a liquid.limit 550…950 Mpa （30XΓCA, 12X2HhA. etc.） possess a high complex of operational properties and.are used.for manufacture of crucial weld.d.prod.cts. They provid. high d.rability of d.sign at simultaneous red.ction in its metal *** main d.fficulty at weld.ng these steels is prevention of formation of cold.cracks in metal of a seam and.zone of thermal influence. Solving this problem becomes complicated.because weld.d.connections should.possess required.operational properties in after weld.ng cond.tion without more heat *** resource-saving technology of weld.ng of multilayered.connections with slot-hole cutting from steel 30XΓCA by a stationary arch in cond.tions of two-jet gas protection in CO2, without preheating and.subsequent heat treatment is d.veloped. The multilayered.weld.d.connections received.by d.veloped.technology possess high enough and.stable operational *** carried.out microstructural analysis of samples has shown presence of fine-d.spersated.structures of metal in seams with implicitly expressed.weld.d.zone, i.e. there is a smooth transition from metal of a seam to the basic metal that provid.s high serviceability of weld.d.connection. It is proved.by a high value of impact strength of samples with a cut in zone of thermal *** preheating and.subsequent heat treatment from technological process of weld.ng of multilayered.weld.d.connections of steel 30XΓCA allows to save 3-4 m3/h of combustible gas （acetylene, natural gas） and.3-4,5 m3/h of oxygen necessary at local heating of weld.d.prod.cts. The economy of gas and.oxygen at weld.ng one running metre of multilayered.weld.d.connection makes 14,58 roubles in the prices of 2002. d.

关键词： Operational properties Multilayered.weld

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