焊后热处理工艺和背部二次焊接对搅拌摩擦焊接7075--t651铝合金性能的影响

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1、t43t3yVol.43No.32007l3st225

2、230KACTAMETALLURGICASINICAMar.2007pp.225{230UYiDbQ{W=AJFUI[

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6、1ALUMINUMALLOYRENShurong,MAZongyi110016InstituteofMetalResearch,ChineseAcademyofSciences,ShenyangCHENLiqingTheStateKeyLaboratoryofRollingandAutomation,NortheasternUniversity,Shenyang110004ZHANGYuzhengCollegeofSciences,NortheasternUniversity,Shenyang110004Correspondent:MAZongyi,professor

7、,Tel:(024)83978908,E-mail:zyma@imr.ac.cnSupportedbyNationalOutstandingYoungScientistFoundation(No.50525103)andHundredTalentsProgramofChineseAcademyofSciencesManuscriptreceived2006{12{08stirwelded,andtheABSTRACT8mmthick7075{T651aluminumalloyrolledplatewasfrictioneectsofpost{weldheat{tre

8、atmentandsecond{weldingoftheweldbackonthetensilepropertywereinvestigated.Theresultsshowthatthesingle{weldedsampleisdefect{freeandthetransversestrengthoftheweldis71%ofthebasematerials.However,alazySlineappearedinthenuggetzoneaszigzagcrackanddiscontinuouscavitiesafterpost{weldT6{treatme

9、nt.Withincreasingsolutiontemperature,becameevident.Afterpost{weldT6{treatment,theVickerstheSlineandabnormalgraingrowthhardnessoftheweldwasrestoredtothelevelofparentmaterial,butthestrengthandelongationweresignicantlyreducedduetothecrackinitiationandpropagationalongtheSline.Thetensil

10、epropertiesweregreatlyimprovedaftersecond{weldingoftheweldback.KEYWORDSfrictionstirwelding,aluminumalloy,solidsolution,tensileproperty:{L%
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