合金化與過(guò)濾技術(shù)對(duì)鑄造鋁鎂合金組織與性能的影響.pdf

1、圖書(shū)分類號(hào)UDcTG2493密級(jí)—擗碩士學(xué)位論文金全絲皇過(guò)遵撞苤麴綾遣堡璧盒金指導(dǎo)教師(姓名、職稱)堂蝮翅夔攫申請(qǐng)學(xué)位級(jí)別王堂亟專業(yè)名稱撻魁墊蘭蘭握論文提交日期論文答辯日期2007年2007年土月】Q日學(xué)位授予日期——年——月——日論文評(píng)閱人丕攔壘丞塹主絲主銎盎銎措答辯委員會(huì)主席緩起。盈：杰壺拯2007年4月5日中北大學(xué)學(xué)位論文InfluenceofAlloyingandFiltrationontheMicrostructureandP

2、ropertiesofCastingAlMgAlloyAbstractTheme也odsofobtaininghighstrensthtoughnessinp豫semincludealloying，purificationandcleaningFromthetOWaspects，thecastingprocessingWasestablished，mouldwasdesignedandtendifferentalloyswereprep

3、aredadoptedmetalmoIlldcastbasedonagreatdealofreferencesAndfiltrationtreatmentWasdonetosomealloysTheroomtemperaturemechanicalpropertiesofthesealloysweretestedThemicrostructureandcompositionoftheseasCastalloyswereanalyzedb

4、yusingOMandSEMTheeffectandlawofminorSc，ZrandfiltrationtreatmentonthemechanicalpropertiesandmicrostructuresofalloysWasinvestigatedTheresultsweretheoreticalanalyzedalsoTheresultsareasfollows：Wheneachelementsatisfiescolloca

5、tio璐dcmandasSc04％Zr01％SiO15％，thehighesttensilestrengthWasobtainedbyorthogonalexperimentThebestschemetoelongationisSc02％一Zr02％一SiO15％TheresearchofalloyingZL303謝tlIScandZrshowedthattensilestrengthandelongationWaSimprovedEs

6、peciallywhilethefilledquantityofScWas04％thetensilestrengthWasobviouslyimprovedto35％CmsstiegrainsizeanddevelopdendritesofZL303wasobservedthoughopticalmicroscopyAddingO2％ZraloneOr02％ScandO1％ZrtogethertoZL303Canfmegrainsins

7、omedegreeForthealloyofadding02％ScthedendriticstructureisstillcoarsebutthesecondphasewithinthegrainsdisappearsAdding04％SctoZL303obtainsequiaxedstructurePrimaryA13ScandAls(Sc，Zr)wereobservedthoughSEMandEDXTensilestrengthan

8、delongationwereimprovedwithfiltrationtreatmentMeanwhile，microstructureswerefineinsomedegreeThestrengtheningincludesolutionstrengtheningofMg，grainfiningstrengtheningofScandZr，dispc格oidstrengtheningofprimaryA13ScandA13(Sc，