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Search Results: 1 - 10 of 495244 matches for " K. Abiko and M. Tanino Schoolof Materials and Metallurgy "
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PREVENTION OF THE INTERGRANULAR FRACTURE AT ELEVATED TEMPERATURES BY ADDITION OF PHOSPHORUS TO A HIGH PURITY Fe0 002% SALLOY
C M Liu,K Abiko,M Tanino Schoolof Materials,Metallurgy,Northeastern University,Shenyang,China Institute for Materials Research,Tohoku University,Sendai,Japan,
C. M. Liu
,K. Abiko and M. Tanino Schoolof Materials and Metallurgy,Northeastern University,Shenyang,China Institute for Materials Research,Tohoku University,Sendai,Japan

金属学报(英文版) , 1999,
Abstract: Theeffectof phosphorusonthehotductility andthesegregation ofsulfuratgrain boundariesin high purityironcontaining 0 002 % sulfur werequantitativelyinvestigated bytensiletestat973 K, SEMobservation of fracture surface and scanning Auger electron spectroscopy.Theexperimental resultscan besum marized as follows:(1) addition of phosphorustothe iron remarkablysuppressestheintergranular fractureinduced bythesegregation of sulfur at973 Kandincreasesthe hot ductility;(2) phosphorusstrikingly decreasesthesegregation ofsulfur atgrain boundaries, whichisresponsibleforthesuppressionoftheintergranularfrac tureat973 K;(3) theremarkably decreasedsegregation ofsulfur atgrain boundariesbytheaddition of phosphoruscan beexplained bythesitecompetitioneffectandtherepulsiveinter action at grain boundariesbetweensulfuratomsand phosphorusatoms;(4) sulfurstrikinglysegregatestothevoid surfacesformed on grain boundaries, while phosphorushaslittlesegre gationtothevoid surfaces.
RELATION BETWEEN THE INTERGRANULAR SEGREGATION OF SAND THE HOT DUCTILITY IN HIGH PURITY Fe SALLOYS
C M Liu,K Abiko,M Tanino Schoolof Materials,Metallurgy,Northeastern University,Shenyang,China Institute for Materials Research,Tohoku University,Sendai,Japan,
C. M. Liu
,K. Abiko and M. Tanino Schoolof Materials and Metallurgy,Northeastern University,Shenyang,China Institute for Materials Research,Tohoku University,Sendai,Japan

金属学报(英文版) , 1999,
Abstract: 1.IntroductionSisoneofthemostdeleteriousimpuritiesinsteelsbecauseitcausesintergranularfailure(IGF)notonlyatlowtemperaturesbutalsoatelevatedtemperatures.ThedeleteriouseffectofSisgenerallyinhibitedbyadditionofMnwhichprecipitateSasMnS.Indeed,additionof…
RECRYSTALLIZATION IN A SPINODAL Cu Ni Fe ALLOY
SM Hao,XJ Hao,G Zhao,HX Li Schoolof Materials,Metallurgy,Northeastern University,Shenyang,China,
S.M. Hao
,X.J. Hao,G. Zhao and H.X. Li Schoolof Materials and Metallurgy,Northeastern University,Shenyang,China

金属学报(英文版) , 1999,
Abstract: Theinteraction ofspinodaldecomposition and recrystallization process,andthecharacteristic ofrecrystallizationin Cu Ni Fe alloy aged atdifferenttemperaturesaftersolution treatmentandcold rolling have been studied by structural analysis and Vickers hardnesstest. It has shownthat the recrystallization of spinodal Cu Ni Fe alloy might be divided into 2 types:spinodal decomposition, recovery and recrystallization oftwo phase microstructuretook placein the deformed alloy aged below thespinodaltemperature; whilerecrystallization ofsingle phase microstructureand growth offullyrecrystallized grainstook placeinthedeformed al loy aged abovethespinodaltemperature .The deformed alloyaged below thespinodaltemper aturerecrystallizedin cellular morphology.
BAINITIC TRANSFOR MATION IN AUSTEM PERED DUCTILE IRON
Z.K. Fan and S.H. Liang Schoolof Materials Science and Engineering,Xi’an University of Technology,Xi’an,China
金属学报(英文版) , 1999,
Abstract: Bainitictransformation processesin austempered ductile iron( ADI) have been discussed at presentstudy. Typicalupper bainitictransformation isconsidered as austenitetransformstobainiticferritediffussionless. When austemperingtimeisextended afterbainitictransforma tion hasceased, carbide will appear in bainitic ferritelaths. During typicallower bainitictransformation ,thefreshlyformed bainiticferriteonlypartitionssomeofitsexcesscarbonin toresidualaustenite, mostofthe restcarbon inthefreshly formed bainiticferriteisprecipi tatedin form ofcarbideatsametime. When austemperingtimeisextended,morecarbideis precipitatedin bainitic ferrite platelets. Carbide also appears atthe austenite/ferriteinter facesbecauseof retained austenite decomposition.
THERMAL DECOMPOSITION BEHAVIOR OF AMMONIUM THIO TUNGSTATE in H_2
P F Xing,L F Ma,K Quan,Y C Zhai School of Materials,Metallurgy,Northeastern University,Shenyang,China,
P. F. Xing
,L. F. Ma,K. Quan and Y. C. Zhai School of Materials and Metallurgy,Northeastern University,Shenyang,China

金属学报(英文版) , 1999,
Abstract: 1.IntroductionAmmoniumthiotungstateisusedasrawmaterialforpreparingWS2〔1〕bythermaldecompositionmethod.AsWS2hasmanyadvantagessuchascorrosionresistance,nopoison,nopollution,widetemperaturerangeforapplicationandsmallfrictioncoefficient,itisextensivelyus…
ASTUDY OF VALENCE OF YTTRIUM IN Y_2O_3 Mo CATHODE
JSWang,MLZhou,JXZhang,ZRNie TYZuo,GJZhang State Key Laboratory of Materials Chemistry,Applications,Peking University,Beijing,China Schoolof Materials Science,Engineering,Beijing Polytechnic University,Beijing,China,
J.S.Wang
,M.L.Zhou,J.X.Zhang,Z.R.Nie T.Y.Zuo and G.J.Zhang State Key Laboratory of Materials Chemistry and Applications,Peking University,Beijing,China Schoolof Materials Science and Engineering,Beijing Polytechnic Univers

金属学报(英文版) , 1999,
Abstract: The valenceofelementyttrium of Y2 O3 Mocathode materialhasbeenstudied by usingther mal weight analysis, X ray diffraction analysis, Scanning electron microscopy and X rayphotoelectronspectrum . It hasbeen provedthatyttrium oxidecan bereduced by molybdenum carbide. Thereaction between powdered Y2 O3 and Mo2 Ccan happen at 1173 , and Y2 O3may bereduced to metallicyttrium . Afterthepowder mixtureof Y2 O3 and Mo2 Cwasheat treated at1873 K, Yttrium existsin two kinds of chemicalstate- yttrium of zero valence and yttrium ofthreevalences.
STUDY OF ANODIC OVERVOLTAGE IN NEODYMIUM ELECTROLYSIS
KRLiu,JSChen,QHan,XJWei,
K.R. Liu
,J.S. Chen,Q. Han and X.J. Wei School of Materials and Metallurgy,Northeastern University,Shenyang,China

金属学报(英文版) , 2003,
Abstract: The anodic overvoltage of neodymium electrolysis was determined by slow scanning oscillograrn. The effects of some factors, i.e. the temperature, the anodic current density, the concentration of Nd2O3 and the components of the electrolyte were investigated and the approaches to decrease the anodic overvoltage were also discussed. The results show that the anodic overvoltage increases with the anodic current density and decreases with the increasing temperature. The linear relation between the anodic overvoltage and the current density corresponding to Tafel equation is determined to some extent. The anodic overvoltage decreases with the increasing concentrations of LiF and NdF3. It also decreases by controlling the anodic current density properly, increasing the temperature or the concentrations of LiF and NdF3 and the reducing polar distance.
Grain refinement in AZ31 alloy processed by equal channel angular pressing
K. Bry?a,J. Dutkiewicz,Institute of Metallurgy and Materials Science, Polish Academy of Sciences, ul. W. Reymonta 25, 30-059 Kraków, Poland
Archives of Materials Science and Engineering , 2009,
Abstract: Purpose: of this paper was to investigate the effect of grain refinement in AZ31 magnesium alloy processed by ECAP and to study microstructure evolution and hardness response of AZ31 alloy associated with ECAP processing.Design/methodology/approach: The microstructure of AZ31 magnesium alloy after two passes of equal channel angular pressing at 150°C, 180°C and 250°C was studied by means of metallographic and transmission electron microscopy. The hardness changes after ECAP processing were determined by Vickers hardness.Findings: The grain refinement in AZ31 magnesium alloy was successfully carried out using ECAP processing at 150, 180 and 250°C. The grain size decreases nearly 10 times after 2 passes of ECAP at 150 and 180°C, but microstructure is characterized by bimodal grains structure. The rather homogenous grains were achieved after ECAP processing at 250°C. Processes of dynamic recrystallization during ECAP were observed. The hardness increase related to grain refinement proceeded by ECAP is in accordance with Hall-Petch relationship.Research limitations/implications: The ECAP processing were carried out only after 2 passes, therefore in order to describe in detail the microstructural changes connected with grain refinement, the analysis of more passes of ECAP processing should be done.Practical implications: The development of highly ductile magnesium alloys allows to apply these materials as structural materials. The grain refinement of materials leads to the significant improvement of the mechanical properties and plasticity. The present results extend the knowledge about grain refinement in AZ31 alloy proceeded by ECAP.Originality/value: The microstructural studies of AZ31 alloy after grain refining by ECAP processing performed by transmission electron microscopy were presented.
PRODUCTION OF ULTRA-FINEα-AL2O3 PO WDERSFROM AMMONIUM A LUMINUM CARBONATE HY DROXIDE
F. Zhang,X. D. Sun,J. You,Z. Zhang,L. X. Dingand Y. M. Wang School of Materials and Metallurgy,Northeastern University,Shenyang,China Liaoning Analyzing and Testing Research Center,Shenyang
金属学报(英文版) , 1999,
Abstract: 1.IntroductionPyrolysisofNH4Al(SO4)·12H2O(AmmoniumAluminumSulfate,AAS)isthetraditionalmethodtoproduceultrahighpurityalphaaluminapowder.CalcinationofAASinvolvesthefollowingchanges〔1-2〕:(1)dissolutionofAASbyitsowncrystallizedwateratabout94℃;(2)evolut…
SYNTHESIS OF ULTRAFINE PLZT POWDER BY A SIMPLE CO- PRECIPITATION METHOD
SYNTHESIS OF ULTRAFINE PLZT POWDER BY A SIMPLE CO-PRECIPITATION METHOD

H Ying,X D Sun,Q B Yang,J B Li,Y M Wang,Z Zhang,J You School of Materials,Metallurgy,Northeastern University,Shenyang,China Departm ent of Materials,School of Mechanical Engineering,Shenyang University,Shenyang,China Liaoning Analyzing,Testing Research Center,Shenyang,China,
H. Ying
,X. D. Sun,Q. B. Yang,J. B. Li,Y. M. Wang,Z. Zhang and J. You School of Materials and Metallurgy,Northeastern University,Shenyang,China Departm ent of Materials,School of Mechani

金属学报(英文版) , 1999,
Abstract: 1.IntroductionDuetoitsunusuallyhighopticaltransparencyandelectroopticproperties〔1,2〕,thetransparentPLZTceramicisapotentialmaterialtobeusedinavarietyofelectroopticdevicesfordatastorage,informationdisplay,andlightmodification.PLZTpowderpreparedbysoli…
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