简介:TechnologicalprocessofrareearthsealinganodizedLY12(2024)alloyisintroduced.Corrosionbehaviorofthefilmwasstudiedbypolarizationcurvesandelectrochemicalimpedancespectroscopy(EIS).Theresultsshowedthatthecoatingremainedpassivityatthepotentialrangefromtheopencircuitpotential(-780mV)to-250mVinNaClsolution.Whenthepotentialexceeded-200mV,corrosionreactionhappenedonthecoating.theresultsofElSanalysiswasconsistentwiththeresultsofpolarizationcurves.
简介:Themicrostructuralevolutionsofadvanced9-12%Crferrite/martensiteheat-resistantsteelsusedforpowergenerationplantsarereviewedinthisarticle.Despiteofthesmalldifferencesinchemicalcompositions,thesteelssharethesamemicrostructureoftheas-temperedmartensite.Itisthethermalstabilityoftheinitialmicrostructurethatmattersthecreepbehavioroftheseheat-resistantsteels.Themicrostructuralevolutionsinvolvedin9-12%Crferriteheat-resistantsteelsareelabo-rated,including(1)martensiticlathwidening,(2)disappearanceofprioraustenitegrainboundary,(3)emergenceofsubgrains,(4)coarseningofprecipitates,and(5)formationofnewprecipitates,suchasLaves-phaseandZ-phase.Theformerthreemicrostructuralevolutionscouldberetardedbyproperlydisposingthelattertwo.Namelyimprovingthestabilityofprecipitatesandoptimizingtheirsizedistributioncaneffectivelyexertthebeneficialinfluenceofprecipitatesonmicrostructures.Inthissense,themicrostructuralstabilityofthetemperedmartensiteisinfactthestabilityofprecipitatesduringthecreep.Manyattemptshavebeencarriedouttoimprovethemicrostructuralstabilityof9-12%Crsteelsandseveralpromisingheat-resistantsteelshavebeendeveloped.
简介:在电的运输性质上评估Ni替换的影响,p类型skutteruditesRyFe3NiSb12(R=Ba,Nd和Yb)系统地从2.5K被调查到800K。由小心地修改三fillers,Ba,Nd和Yb的充满的部分,搬运人集中精确被调整,它按比例改变到数统治的原子价计算的名字的价值。活动性和Seebeck系数的搬运人集中依赖表示在原子价乐队的二乐队贡献,和为热电的性能的优化搬运人集中在之间(5–9)×1020厘米−3。样品的热电导率用稀土元素的元素(Nd和Yb)填满的格子作为与相比显著地更低充满Ba,由于更低的反响的频率并且部分充满。与公司替换相比,Ni替换趋于关上乐队差距,它为RyFe3NiSb12。然而由于状态的密度的改进,当搬运人集中是类似的时,RyFe3NiSb12比RyFe2公司2在更低的温度范围的Sb12。0.73的ZT价值为Yb0.77Fe3在600K的NiSb12。