組織結(jié)構(gòu)對(duì)u5.7wt.％nb合金氫化反應(yīng)的影響

1、獨(dú)創(chuàng)性聲明本人聲明所呈交的學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。據(jù)我所知，除了文中特別加以標(biāo)注和致謝的地方外，論文中不包含其他人已經(jīng)發(fā)表或撰寫(xiě)過(guò)的研究成果，也不包含為獲得中國(guó)工程物理研究院或其他教育機(jī)構(gòu)的學(xué)位或證書(shū)使用過(guò)的材料。與我一同工作的同志對(duì)本研究所做的任何貢獻(xiàn)均已在論文中作了明確的說(shuō)明并表示謝意。學(xué)位論文作者簽名：易仰乖簽字日期：加I侔石肜日學(xué)位論文版權(quán)使用授權(quán)書(shū)本學(xué)位論文作者完全了解并接受中國(guó)工程物理研究院

2、研究生部有關(guān)保存、使用學(xué)位論文的規(guī)定，允許論文被查閱、借閱和送交國(guó)家有關(guān)部門(mén)或機(jī)構(gòu)，同時(shí)授權(quán)中國(guó)工程物理研究院研究生部可以將學(xué)位論文全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫(kù)進(jìn)行檢索，可以影印、縮印或掃描等復(fù)制手段保存、匯編學(xué)位論文。學(xué)位論文作者簽名：鋤乖簽字日期：7口中年鉬3日導(dǎo)師虢飭法簽字日期：跏f涉年多月畢目組織結(jié)構(gòu)對(duì)u57wt％Nb合金氫化反應(yīng)的影響AbstractThemicrostructuresofsixagedU57Nballoysi

3、ncludingasquenched，200。C／6haged，400。C／3haged，400。C／9haged，500。C／2hagedand400。C／9h500。C／2hagedsamplesweresystematicallyinvestigatedinthisthesisAseriesofhydridingexperimentsforallsampleswerecarriedoutunderthesamereactionco

4、nditionswiththetemperatureat100。C，whiletheinitialhydrogenpressureof1atmTheexperimentalresultsindicatedthatduringthehydridingreaction，themicrostructuresoftheU57Nballoywereprovedtobethedeterminingfactorfortheexpandingofthe

5、hydrideThisconclusionprovidesanewscientificunderstandingoftheinfluenceforhydrogencorrosionforuraniumniobiumalloysandlaysthefoundationofthefollowingresearchesaboutthehydrogencorrosionforuraniumniobiumalloysDuringtheinvest

6、igation，thelaserscanningconfocalmicroscopy(LSCM)，thescanningelectronmicroscopy(SEM)，thetransmissionelectronmicroscopy(TEM)andXraydiffracmeter(XRD)wereappliedtoanalyzethemorphologies，thephasecompositionsandthemicrostructu

7、resbeforeandafterthehydridingexperimentsforeachagedalloysampleTheresearchingresultscanbebrieflysummarizedatthefollowingaspectsFirsttheanalyzingresultsoftheasquenchedand200oC／6hagedsamplesshowednodistinctchangesintheLSCMa

8、ndSEMphotographs，theXRDdatashowedthatthephasecompositionswerebothsupersaturated0【”behavingasthemartensitetwininsidethematrixHoweverthetwosamplesdidn’treactwithhydrogenundertheexperimentalconditionsinthisworkAstothe400。Ca

9、gedsamples(400。C／3h，400。C／6h)，themicrostructureschangedcomparingwiththeasquenchedsamplewiththeappearanceofdiscontinuousprecipitation(DP)ontheprioryboundariesandaroundtheimpuritysitesThemorphologychangedfrommartensitetwin

10、toalattice—likestructureformedbytheacicularstructureatarelativelylargerscaleespeciallycausedbythe400oC／3hagingtreatmentThecorrespondingXRDresultsrevealedtheappearanceoftheNb—depleted0cphaseAfterthehydridingexperimentsund

11、eridenticalconditions，thehydridesformedonthesurfaceofthetwoagedsampleshadtypicaltreelikemorphologyandtreelike—lamellarcoexistencemorphologyrespectivelyHereitsnecessarytoemphasizethatthedimensionofthe‘‘trees”couldmatchwel

12、lwiththe“l(fā)attice”Atlastthe500。C／2hand400。C／9h500。C／2hagedsampleshadrelativelycompletephasedecomposition，particularlythelatersamplealmostdecomposedentirelyBothsampleshadfluelamellarDPbi—phasemicrostructureswiththecomposed