SiC-,p--AZ61復(fù)合材料觸變塑性成形本構(gòu)關(guān)系及數(shù)值模擬研究.pdf

1、南昌大學(xué)碩士學(xué)位論文SiCAZ61復(fù)合材料觸變塑性成形本構(gòu)關(guān)系及數(shù)值模擬研究姓名：王建金申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：閆洪20080601AbstractABSTRACTComparedwithtraditionalmetalmaterials，particulatereinforeedmetalmatrixcomposites(PMMCs)possesseslotsofadvantages，suchashighspec

2、ificstiffness，11ighspecificstrength，goodresistancetohightemperature，wearandfatigueandgoodsteadinesstochemicalanddimensionThedevelopmentofthesemi—solidtechnologyisprovidingbrightfuturesforthefabricationprocessandtheshapin

3、gprocessofmetalmatrixcompositesInthispaperexcellentsemisolidSiCp／AZ61compositeswerefabricatedbythemethodofstircastingandisothermalheattreatmentThenthebillets塒tlldifferentSiCvolumeswerecompressedbyThermecmastorZdynamicmat

4、erialtestingmachineatdifferentdeformationtemperaturesanddifferentdeformationratesTherelationshipsbetweenstressandstrainwereanalyzedindifferentdeformationconditionsTheinfluencesofthedifferentdeformationtemperatures，differ

5、entdeformationratesandthevolumeofSiCparticulatewereanyalysisedTheresultsindicatethatthetruestressofsemi—solidSiCp／AZ61compositeswassensitivetotemperatureandstrainratesThelurestressishigher、析t11theincreasingofthevolumeofS

6、iCparticulateTheresultsshowthatthedeformationforceWasrequiredmainlytoovercomeparticleslidingandparticleplasticdeformationinthixotropiccompressionprocessofhighsolidphasefractionforsemi—solidSiCp／AZ61composites，inwhichthes

7、lidingbetweensolidparticlesandplasticdeformationofsolidparticlesmechanismsweredominantAnewconstitutivemodelforsemisolidcompositeswasdetivedbyanalyzingconstitutiverelationshipsofsemi—solidmetalandcompositesParametersinthe

8、constitutivemodelwereresovedbasedonsemisolidSiCp／AZ61compositesthixotropiccompressiondataThetotalsemisolidSiCp／AZ61compositesthixotropicplasticfc，mingconstitutivemodelisO“=exp(82736650158fv296555f214253359／／3一～擴(kuò)一[1pf]j16