简介：Afiniteelementbasedsensitivityanalysismethodforpreformdieshapedesigninmetalforgingisdeveloped.Theoptimizationgoalistoobtainmoreuniformdeformationwithinthefinalforgingbycontrollingthedeformationuniformity.Theobjectivefunctionexpressedbytheeffectivestrainisconstructed.Thesensitivityequationsoftheobjectivefunction,elementalvolume,elementaleffectivestrainrateandtheelementalstrainratewithrespecttothedesignvariablesareconstituted.ThepreformdieshapesofanH-shapedforgingprocessinaxisymmetricdeformationaredesignedusingthismethod.

简介：stoichiometric钒(IV)氧化物薄电影被控制退火的温度，时间和压力获得。thermochromic阶段转变和400nm和900nmVO2的IRthermochromic性质变瘦在7.5m-14m区域的电影被讨论。导出的VO2薄电影样品被拉曼，XRD，XPS，AFM，SEM，和DSC描绘。抵抗和在不同温度下面的VO2薄电影的红外线的放射率被测量，并且电影的热图象用红外线的成像器被获得。VO2薄电影在550点退火了的结果表演?????????????????堠???????????????？？

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简介：TheW-Cucompositesarewidelyusedasweld-ingelectrodes,electronicpackagingmaterials,electricdischargematerialsandheatsinksbecauseoftheexcellentproperties.Inthisresearch,theW-40wt.%Cucompositeswerepreparedthroughthevacuumhot-presssinteringmethod,andtheeffectofsinteringtemperatureonthemicrostructureand

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简介：Highentropyalloyhasattractedincreasingattentions.However,toenhancethealloystrengthoftenleadstoimpairmentoftheductility,orviceversa.HerewereportedaheattreatmentapproachonAlCrFeNi2Ti0.5highentropyalloy,whichcanelevatethestrengthandductilitysimultaneously.AningotofAlCrFeNi2Ti0.5weighing2.5kgwasfirstlyfabricatedbymediumfrequencyinductionmelting.Thensamplesfromthesameheightofthebulkingotwereannealedfor6hat600,700,800and1000℃,respectively.After1000℃annealing,anoptimalmicrostructurewasobtainedbyusingourapproachwhichcanmakesomeprecipitationparticlesdistributehomogeneouslyinthedendriteinteriorwhilekeeptheinterdendritestructureasasinglesolidsolutionphase.ThemechanicaltestonthisAlCrFeNi2Ti0.5alloysampleshowedthat,thecompressivefracturestrengthσbcwasincreasedbyabout600MPaandtheplasticstrainepwasdoubled,comparedwiththoseoftheas-castsample.Ourapproachcanbereadilyadaptedtolarge-scaleindustrialproductionofhighentropyalloyswithhighstrengthandductilitybyproperannealingtreatment.