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1、塑熟萬方數(shù)據(jù)Availableonlineatwww。sciencedirect。com·乏：，ScienceDirectPressTrans．NonferrousMet．Soc．China22(2012)s364一s369TransactionsofNonferrousMetalsSocietyofChinawww．協(xié)msc．cnFormabilityandmicrostructureofAA6061A1alloytubeforhotmetalgasformingatelevatedtemperatureHEZ
2、hu-binl，F(xiàn)ANXiao-b01，SHAOFeil’，ZHENGKai—lunl，WANGZhi．bia01，YUANShi-jianl1．NationalKeyLaboratoryforPrecisionHotProcessingofMetals，HarbinInstituteofTechnology,Harbin150001，China；2．LuoyangShipMaterialResearchInstitute，ChinaShipbuildingIndustryCorporation(CSIC)，Lu
3、oyang471039，ChinaReceived28August2012；accepted25October2012Abstract：Freebulgingtestwascarriedoutatdifferenttemperaturesrangingfrom350oCto500。CtoevaluatetheformabilityofAA6061extrudedtube，whichcanprovidetechnologyfoundationforcomplexstructuresforminginhotmetal
4、gasforming(HMGF)process．Maximumexpansionratio(MER)andburstingpressurewereobtainedtoevaluatedirectlytheformabilityatheatedconditions．Vickershardnessatdifferentpositionswasmeasured．Thefracturesurfaceafterburstingwasobservedwithscanningelectronmicroscope(SEM)，an
5、dthemicrostructurechangealongaxialandhoopdirectionswasanalyzedbyelectronbackscatteringdiffraction(EBSD)．TheresultsshowthatthelargestMERvalueis86％at425。C．Burstingpressuredecreasesfrom4．4MPato1．5MPawithtemperatureincreasing．TheVickershardnessoffracturepositioni
6、salittlehigherthanotherpositionsaftergasbulging．Thefracturemechanismisstillthemicro-poreaggregationfractureatelevatedtemperature，whileoverheatedstructureappearsseriouslyat500。C．Theinitialfineequiaxialgraingrowsastemperatureincreases，whichiselongatedsimultaneo
7、uslyinbothaxialandhoopdirections．Keywords：aluminumalloytube；freebulgingtest；hotmetalgasforming；formability；microstructure；fracturemorphology；grainmorphology1IntrOductiOnWeightreductionhasbecomeoneoftheresearchfocusesinthefieldofmaterialsprocessing．whichcanber
8、ealizedbyoptimizedstructuraldesignandusageoflightmaterials『11．Partwithirregularcross—sectionsismanufacturedbyusing1ightmaterialandoptimizedstructure．whichhasobtainedmoreandmoreapplication
