二元合金凝固過程中樹枝晶演變?nèi)S模擬.pdf

1、分類號UDClY790101Y790120嘉級q衛(wèi)巫羽=編金2盟型墨繕學(xué)位論文3。。D。S。i。m。u1ationforDen。d。r。i。t。。icGrain，——E————v——o———l—u———t—i—o—n—inS。。。o。1i。d。。ificationProces—s——e———s————o———f————B————i—naryAlloys許林申請學(xué)位級別王堂亟學(xué)科專業(yè)名稱扭撼遮讓叢理途論文提交日期2QQ生旦論文答辯日期竺Q

2、Q5生魚旦一學(xué)位授予單位和日期直昌盔堂至QQ三生Z旦一答辯委員會主席評閱人2005年6月絲!塞耋盟一象弛3一DSimulationforDendriticGrainEVolutioninSoHdificafionProcessesofBinaryAlloysThedendriticevolutionduringsolidificationprocessofbinaryalloysisinvestigatedbynumericalsimu

3、lationtechniqueA3DMicrosCAmodel，consideringcoupledtemperaturefield，concentrationfieldandphasefield，hasbeenbuiIttoinvestigatethesolidificationprocessofbinaryalloysfromdifierentscalesnliswerkhelpstounderstandt11esolidifica

4、tionmicrostructureandalsoprovidesatheoreticalreferencetocontrolthemorphologyofmicrostructureThepaperincludesthefollowingfiveparts，whichare11A3DMicrosCAmedel，takingdirectdifierencemethod，MonteCarlomethodandOrientedobjectm

5、ethodintoaccount，isbuiltonthebasisoftheprevious2DmodelTllismodeldescribesthegeneralideaof3Dcellularautomatawhichisverysupportivetheoreticallyandmethodologicallyforthemicrostructuremodeling21Specificallya3DMicrosCASolidif

6、icationmodelisbuiltbasedontheabevementioned3DmicrosCAmodelT11ismodelwi也theapplicationofadeterministicmodelandastochasticmodel，and，amacromodelandamicromodelistheinstantiationofmetalselldificationtheories3、Basedonthis3DMic

7、rosCA—Solidificationmodelandtogether而ththepostprocessingsoftware，a3DMicrosCASolidificationsimulationsoftwareisdevelopedtocarryouttherealtimecalculationmadvisualizationof3Dbinaryalloymicrostrucmresolidificationevolutionan

8、dhenceprovidewithavirtuallaboratoryforthestudyofmicrostructuresolidificationevolution4、AnotherCAmodel州astacmethod)isusedtosimulateevolutionprocessofsingleormaltidentritei112D51Aseriesofcomputersimulationhavebeendonetobin

9、aryalloysBytheoreticalallalysisand，withthecomparisontosimulationandexperimentalresultsofauthorativescholars，this3DMicresCAmodelundercertaincircumstanceshasbeenprovedtobereliableandaccurateDirectedbyProYangXiangjieWritten