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1、Trans.NonferrousMet.Soc.China22(2012)1−7WarmformingbehaviorofhighstrengthaluminumalloyAA70751,22211WANGHui,LUOYing-bing,PeterFRIEDMAN,CHENMing-he,GAOLin1.CollegeofMechanicalandElectricalEngineering,NanjingUniversityofAeronauticsandAstronautics,Nanjing2100
2、16,China2.DepartmentofManufacture,FordMotorCompany,Dearborn,MI,48124,USAReceived18November2010;accepted14February2011Abstract:TheformabilityofaluminumalloyAA7075atelevatedtemperaturewasinvestigatedthroughexperiment.Stress—strainrelationshipatdifferenttemp
3、eraturesandformingspeedswereinvestigatedthroughtensiletesting.Deepdrawingandstretchformabilitywerealsotestedthroughlimitingdrawingratio(LDR)andlimitingdomeheight(LDH)tests.Finally,postformingmechanicalpropertytestingwasconductedtoinvestigatetheeffectsofex
4、posuretowarmformingtemperaturesonthemechanicalproperties.ResultsshowthatdeepdrawingandstretchformabilityofAA7075canbesignificantlyimprovedwhentheblankisheatedto140−220°C.Attemperatureover260°C,formabilityandpostformingmechanicalpropertiesbegintodecreasedu
5、etotheeffectoftheheatingandformingprocessesonthematerial’stemper.Keywords:aluminumalloy7075;warmforming;limitingdrawingratio(LDR);limitingdomeheight(LDH)thenartificialaging.Inmostcasesthisrequiresa1Introductionsecondarycalibrationprocesstofixthedistortion
6、duetothehightemperaturesolutionheattreatandquenchingWeightreductionhaslongbeenidentifiedasakeyprocess.Forcomplicateddeepdrawparts,superplasticpriorityforimprovingautomotivefueleconomy[1,2].formingisoftenutilized[9,10].SuperplasticformingisOneofthemethodsi
7、nweightreductionofautomotivealowspeed,hightemperatureprocessthatalsorequiresstructuresistoreplacesteelwithlightmaterialssuchasahightemperatureheattreatmentandperhapscalibrationaluminumandmagnesiumalloys[3].Todate,severalstepafterforming.Bothofthesetechnol
8、ogiesarenotpartsofthevehiclebodyandpowertrainhavebeenwellsuitedtothehighvolumeproductionratesoftheconvertedtoaluminumsuchastheengineblockandautomotiveindustry.Oneprocessthatmaybesuitableheads,wheelsandsomebodypanels
