Y. Zhuo1)
,
M. Gao1
,
2)and J.Y. Chen1
,
3) 1) Department of Physics
,
Shenyang Normal College
,
Shenyang 110031
,
China2) Institute of Metal Research
,
The Chinese Academy ofsciences
,
Shenyang 110015
,
China 3) International Centerfor Materials Physics
,
CAS
,
Shenyang 110015
,
China
金属学报(英文版)
BiVxSrCaCu2 Oysystem glasses were prepared by using doubleroller quenching method. Thedifferentialthermal analysis was employed to investigate the effect of V doping on glass forming ability( GFA). Theresultsshowedthatthe GFAof Bisystem increases withthein creasing ofthe amountof Vdoping. Thebestatomic ratiofor having both superconductivityandthegreatest GFAwas BiV0 18 CaCu2 Oy .
关键词:
analysis Bisystem glass
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null
,
null
C.S.Hu1
,
2) and Y.X.Gu3) 1) Department of Mechanical Engineering
,
Fushun Petroleum Institute
,
Fushun 113001
,
China 2) State Key Laboratory for Corrosion and Protection
,
Institute of Corrosion and Protection of Metal
,
The Chi nese Academy of Science
,
Shenyang 110015
,
China 3) Departmentof Materials Scienceand Engineering
,
Shenyang Polytechnic University
,
Shenyang 110023
,
China
金属学报(英文版)
Weldingthermalcyclicsimulated techniquesisemployed in thestudy. By meansof analysismetalloscope, fracture morphology and impact toughness test of the sample, the effect ofweldingthermalcycle peak temperature and dualthermal cycle on the micro structure and toughnessoflow alloy high strength steel HQ100 isinvestigated.Inner fine martensitic andbainitic microstrctureisobservedby TEM.Theresultsshow that withtheincreaseof peaktem perature, grain sizesbecomelarger,theimpacttoughness drop down .Ifthermalcycleisim posed twiceand dualthermalcyclicpeaktemperatureis1275 ℃+ 750 ℃,theimpacttoughnessisatthelowest value.Alsotheimpacttoughnessagrees withthefracture morphology.
关键词:
thermalcycle
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null
,
null
,
null
J.H.Yang1
,
2)
,
S.X.Li1)and C.X.Ma2) 1) State Key Laboratoryfor Fatigueand Fracture of Materials
,
Instituteof Metal Research
,
The Chinese Academy of Sciences
,
72 Wenhua Road
,
Shenyang 110015
,
China 2) Department of Materials Physics
,
Northeastern University
,
Shenyang 110006
,
China
金属学报(英文版)
The dislocation evolution wassimulated by using positiveand negative parallelstraightedgedislocationsrandomly distributing on the primary slip planes astheinitialconditions. Thevein and wallstructuresof dynamicequilibrium have been obtained. Abig dipolestructure wasfound inthesimulation.
关键词:
computersimulation
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null
,
null
,
null
J. Zhang1
,
2)
,
G.P. Li1) and D. Li1) 1) Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China 2) Shenyang University
,
Shenyang 110044
,
China
金属学报(英文版)
omesolution treatmentsfor Ti 5 8 Al 4 8Sn 2 0Zr 1 0 Mo 0 34Si 0 90 Nd (1 # alloy) , Ti 6 3 Al 4 8 Sn 2 0 Zr 1 0 Mo 0 34 Si 0 90 Nd(2 # alloy) and Ti 6 8 Al 4 8Sn 2 0 Zr 0 5 Mo 0 34 Si 0 70 Nb 0 90 Nd (3 # alloy) several near alpha Titanium alloysat various temperaturesin (α+ β) two phaseregion havebeen carriedout. Theeffectsofsolution treat menttemperatureon theshape,size, distribution andvolumefraction ofthe primary alpha phase(αprim)havebeeninvestigated. Theresultsshowed thattheshape ofαprim did not depend onthesolution temperature, butthesize, the distribution and the volume fraction changed withthevariedsolutiontreatmenttemperature. Theprimaryalpha phaseprincipally precip itated atthe βgrain boundary regions atthe higher temperature nearthe Tα+ β/ β, and asthe temperature was dropped, αprim precipitated in a more uniform way. By energy spectrumanalysisof SEM, the elemental distributionsin primary αphase and transformed βphase(βtrans) havebeeninvestigated. The resultsshowed thatthe amount of Alelementin αprim is higherobviouslythanin βtransathighertemperature. Asthesolution temperature gotdropped theconcentrationsof aluminum elementgot moreuniform in both αprim and βtrans. Thehigher concentration of aluminum elementin αprim would play a importantrolein orderedα2 phase precipitation, and so have an importanteffecton the high temperature properties of the al loys.
关键词:
titanium alloy
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null
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null
