Ce对Al-Si-Cu合金中α（Al）-Al2Cu共晶形貌的影响-论文.pdf

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1、Availableonlinealwww．sciencedirect．comTransaetionsof静二ScienceDirectNonferrousMetalsSocietyofChinaEI，s]巳VIERPressTrans．NonferrousMet．Soc．China24(2014)36—41WWW．tnmsc．cnEffectofCeonmorphologyofa(A1)。——A12CueutecticinA1_——Si_——CualloyMajaVONC1NA，Jo~efMEDVED，TonicaBONCINA27Fran

2、cZUPANIC1．DepartmentforMaterialsandMetallurgy,FacultyofNaturalScienceandEngineering，UniversityofLjub~ana，Agker~eva12，SI一1000LjubUana，Slovenia；2．UniversityofMaribor，FacultyofMechanicalEngineering，Smetanova17，SI-2000Maribor,SloveniaReceived7April2013；accepted5August2013Abstr

3、act：TheeflfectofCeadditiononthemorphologyofthea(A1)一Al，CueutecticinA1-Si-Cualloywasinvestigatedusingthermalanalysis，lightmicroscopy,scanningelectronmicroscopy,focusedionbeamandenergydispersiveanalysis．Theresultsshowmattheeutectica(A1)一Al，Cuforillswithinsmal1spacebetweenden

4、drites．siliconandA1SiFeMnplates．EutecticA1，Cuisnot1amellarbutdegenerated．However,Al，CuinCe—modifiedalloysismorecompact．CepartiallydissolvesinAI，Cu．whichisaviablereasonfortheformationofcoarserA1，Cu．TheadditionofCealsoincreasesthemicrohardnessofthefAl卜A1，Cueutecticbyalmost1O

5、％comparedwiththebasicA1-Si-Cualloy．Kevwords：A1-Si-Cualloy；cerium；eutectic；microstructure；focusedionbeamnormalAl1一Al，Cueutecticwasconsideredtobegin1IntroductionwiththenucleationoftheA1，Cuphase．followedbythea(A1)nucleatedheterogeneouslyandepitaxiallyontheA1——Sialloystypicall

6、ycontaincopperandAl，Cuphase．Understeady—stateconditionsthesometimesmagnesiumasthemainalloyingelementsinfA1)—_Al，Cueutecticpossessesfaultedlamellarstructureordertopromoteprecipitationhardening．Thetypesandbecausebothphaseshaveratherlowentropyofsolutionquantitiesofintermetall

7、icphasesandheterogeneousattheeutectictemperaturer15．1J／(mol·K1forAl2Cuandstructuresdependlargelyonthecompositionand12．9J／(molK)for(A1))．Duringtheearlystagesofprocessingofthealloys[11．Copperisboundmainlyinsolidification．severaldegeneratestructurescanform．A12Cu．A12Cuoftenapp

8、earsasapartofatwo-phaseThesteady．statestructuredevelopsonlyfromtwoofheterogeneousstructur