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简介：Rareearthmasteralloyisoneofthemostim-portantrareearthproductsinChina.Theoutputofrareearthferrosiliconwas3800tonREOin1991,2.2%.increaseincomparisonwith3700tonREOin1990.Itsprincipalapplicationisindomesticfoundryindustry.Sincetheratioofexporttothetotaloutputoftheproductisrathersmallitisunderlittleinflu-

简介：ThemorphologyandcrystallographyofphasesintheCu-0.12%Zralloywereinvestigatedbyscanningelectronmicroscope(SEM),transmissionelectronmicroscope(TEM),andhigh-resolutiontransmissionelectronmicroscope(HRTEM).Theresultsshowthattheas-castmicrostructureofCu–ZralloyismainlyCumatrixandeutecticstructurewhichconsistofCuandCu5Zrphaseswithafinelamellarstructure.Thedisk-shapedandplatelikedCu5Zrphaseswithfccstructurearefoundinthematrix,inwhichhabitplaneisparallelto{111}aplaneofthematrix.BetweenthecoppermatrixandCu5Zrphase,thereexistsanorientationrelationshipof[112]a||[011]Cu5Zr;(111)a||(111)Cu5Zr.ThespacestructuremodelofCu5Zrphasecanbeestablished.

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简介：Theelevatedtemperaturetensileexperimentshavebeencarriedoutonthemagnesiumalloyandresultsindicatethatthemagnesiumalloyhasexcellentsuperplasticproperty.Gleebe-1500testingmachinewasusedinthediffusionbondingexperimentonthesuperplasticmagnesiumalloy.Then,theshearstrengthofthejointsunderdifferentconditionsisobtainedthroughsheartestingandtheoptimumprocessingparametersforthediffusionbondingareachieved.Bymetallurgicalmicroscopeandscanningelectronmicroscope(SEM),itisrevealedthatthemicromechanismofdiffusionbondingistheslideofgrainboundariescausedbythegrowthofgrainsandatomdiffusionofthesuperplasticmagnesiumalloy.

简介：一台新、创新的基础隔离设备基于作者和他们的同事执行的广泛的研究在这篇论文被介绍。设备的一个原型在摇晃的桌子上被造并且试验性地测试了。新基础隔离设备由二个磁盘，有三水平伸臂支撑的上面的增大的一垂直柱体，和记忆合金(SMA)锁的至少三使倾向的形状组成。SMA酒吧的角色是限制在底和上层建筑之间的相对动议，到由他们的超级橡皮的组成的法律并且到保证浪费体力设备重新集中。验证期望的表演，一个原型在正弦曲线下面被造并且测试与不同振幅增加频率的排水量的波浪。建议基础隔离设备的主要特征是为周期的装载，合金的超级橡皮的行为导致宽负担排水量环，这被显示出，在大量体力被浪费的地方。

简介：BulkZr55Al10Ni5Cu30metallicglassplateswithadimensionof85mm×35mm×4mmandacomplicatedplatewerefabricatedbyinjectingcastingmethodusingspongyzirconiumandindustrialpurityaluminum,nickelandcopperasrawmaterials.Itwasshownthattheholdingtimeofliquidmetalsatelevatedtemperatureshadagreatinfluenceontheoxygencontentoftheplatesduetothecontaminationresultingfromtheatmosphere.Increasingholdingtimeresultedintheincreaseofoxygencontentintheinjectedalloy.Theglasstransitiontemperaturesofthebulkmetallicglassplatesarehigherthanthatreportedintheliteratureandcrystallizationtemperatureislowerfortheonewithhigheroxygencontentatthesameheatingrate.Theextensionoftheundercooledliquidregion△Txreachingabout87Kis3Khigherthanthatpreviouslyreportedand26Khigherthanthatwithoxygencontentof0.076wtpctfortheonewithoxygencontentashighas0.065wtpct.Thereforetheoxygencontentofthealloyhasasignificantinfluenceontheglassformingabilityandthermalstabilityofbulkmetalglass.Itissuggestedthatdirectcorrelationbetweenhighglassformingabilityandlarge△Txisonlyvalidforawell-definedIowoxygenconcentrationorhastobereconsideredbyincorporatingoxygenasanadditionalalloyingelement.

简介：PrecipitationstudywascarriedoutinNi-35at.pctCralloybymeasuringelectricalresistivityatdifferentageingtemperaturesandlongageingtimes.Duringageing,itwasobservedthatelectricalresistivityinitiallyrosewithageingtimeandthenfellafterverylongageingataconstanttemperature.TheinitialincreaseinresistivityduringageingmaybeattributedtotheformationofGPzones/Cr-richprecipitatesatearlystagesbynucleationprocessanddecreaseinresistivity,andafterattainingamaximum,isduetothegrowthofprecipitateparticlesandsubsequentlybycoarseningoftheseprecipitates.TheresultsofelectricalresistivitymeasurementsduringageingwereconfirmedbyX-raydiffractionanalysisindicatingtheformationofaCr-richphaseandaCr3Ni2phaseintheNimatrix.

简介：四个参数，煤气的流动，旋转速度，精制时间，和炖的时间的效果，在7075的旋转impeller精炼上，艾尔被学习。C2精制的Cl6，精制的旋转impeller，并且7075艾尔合金的合成精制与对方相比。结果证明旋转impeller精炼的最大的影响参数是旋转速度，由煤气的流动，精制时间，和炖的时间列在后面。直角的分析获得的最佳纯化参数如下：400r/min，0.4mL/h的惰性的煤气的流动，15min的精制时间，和6min的炖的时间的转子速度。最好的排除效果能被C2Cl6和旋转impeller。C2Cl6,旋转impeller，并且合成精制分别地是34.5%，69.2%，和78%。旋转impeller精制的标本的机械性质比由C2精制的Cl6，但是比那些低由合成精制。

简介：在为半固体AZ91D的不同温度，紧张率和成立时间的等温的压缩实验，Zr与更高的固体修改了AZ91D和MB15合金体积部分被使用Gleeble-1500D模拟器和真压力紧张曲线执行是表观粘度对温度的givendirectly.The关系，砍率和三种半固体镁合金的成立时间，以及等温的稳定的州的rheologicalcharacteristic和机械行为被学习。结果证明三镁合金有半固体MB15的逻辑特征是的shear-thinning.The变阻器的特征与半固体MB15更高有的半固体AZ91D.The的不同表观粘度和变丑抵抗。

简介：Aresidual-stressprofilealongthethicknessofanaluminumalloysheetisdeterminedbylaser-ultrasonictechnique.SurfaceacousticwavesaregeneratedbyaNd:YAGpulselaseranddetectedbyaHeterodyneinterferometeronalateralfreesurfaceofthesheet.Thedistributionofresidualstressisdeterminedbymeasuringtherelativevariationofthewavevelocitiesatdifferentlocationofthesamplealongitsthickness.Thistechniqueisvalidatedbythreedifferentresidualstressprofilesobtainedexperimentally.

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简介：Niobium,asthemosteffectivesecond-phaseformingelement,wasaddedintheFe-Cr13-C-Nhard-facingalloytogetcarbonitrideprecipitates.Morphologyandcompositionofcarbonitrideinthehardfacingalloywerestudiedbyopticalmicroscopy,scanningelectronmicroscopy,andelectronprobemicroanalyzer.Thether-modynamicsandtheeffectonthematrixoftheformationofcarbonitridewerealsodiscussed.ItwasfoundthatniobiumcarbonitridesarecomplexNb(C,N)precipitatedistributedongrainboundaryandmatrixofthehardfacingalloy.Underas-weldedcondition,primarycarbonitrideparticleswerereadilyprecipitatedfromthehardfacingalloywithlargesizeandmorphologyastheywereformedalreadyduringsolidification.Underheattreatmentcondition,alargenumberofsecondarycarbonitridescanpre-cipitateoutwithveryfinesizeandmakeagreatsecondaryhardeningeffectonthematrix.Asaresult,additionofniobiuminthehardfacingalloycanpreventtheformationofchromium-richphaseongrainboundariesandinter-granularchromiumdepletion.

简介：Thevacuumdiffusionbondingoftitaniumalloytotin-bronzehasbeenstudiedandthefeasibilityandappropriateprocessingparametershavebeeninvestigated.Themaximumtensilestrengthofthejointsis168MPa,andafirmjointisobtained.ThemicrostructureofdiffusionbondedjointhasbeenobservedbySEM.X-rayandEPMA,andthemainfactorsaffectingdiffusionbondinghavebeenanalyzed.TheintermetalliccompoundsTi2CuandTiCuwereformedneartheinterface.Thewidthandquantityoftheintermetalliccompoundincreaseswiththeincreaseofthebondingtime.Theformationoftheintermetalliccompoundsresultsinembrittlementofthejointandthepoorjointproperties.

简介：Onthebasesofhightemperaturecreepexperiments,theresearchonengineeringapplicationofrheologicalformingiscarriedoutontwokindsoflightmetalalloypartsnamedcylindricalshellofLc4aluminumalloyandvanediskwithcomplexcurvedsurfaceofTC11titaniumalloy.Moreover,themechanicalpropertytestsunderroomandhightemperaturesfortheworkpiecesproducedbythisnewtechniquearealsodone,theresultsshowedthattheyaremuchimprovedevidentlycomparedwiththoseproducedbytraditionalmethod.

简介：AUltrafineamorphousNiBalloywaspreparedviachemicalreductionmethod;ItsstructuresduringthecrystallizatioinprecesswascharacterizedbysuchtechniquesasDifferentialthermalanalysis(DTA),X-rayabsorptionfinestructure(XAFS)andX-raydiffraction(XRD),andcorrelatedtothecatalyticpropertiesforbenzenehydrogenation.ItwasfoundthatthecrystallizationofamorphousNiBalloywascarriedoutintwosteps,asindicatedbytwoexothermicpeakscenteredat598and652Krespectively.Duringthefirststep.twometastablecrystallinephases,i.e.,Ni3BandanoaocrstallineNiphase(Ni-richNiBalloy),wereformed.Furtherannealingathighertemperatureof652KmayresultinthedecompositionofcrystallineNi3BandaggregationofnanocrystallineNi,thebenzenehydrogenationisoptimizedaroundtheannealingtemperatureof623K.ItmostprobablyresultsfromthemaximumamountofactivesiteonnanocrystallineNiformedbythermaltreatmentatappropriateannealingtemperature.

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