5056铝合金圆锭表层偏析对挤压管材的影响_黎业生

12№2015－12－031966－。DOI10．13979/j．1007-7235．2016．04．00350561122221．3410002．5264635056、、。520℃7h。5056TG146．21A1007－7235201604－0012－05Effectofsurfacesegregationof5056Al-alloybilletsonextrudedpipesLIYe-sheng1JIANGYa-long1XIEKan-ru2LIUJing-fa2DENGZhi-hong2LUOJie21．JiangxiUniversityofScienceandTechnologyGanzhou341000China2．GuangdongHoshionIndustrialAluminumLimitedCompanyZhongshan526463ChinaAbstractTheeffectsofsurfacesegregationlayeronhomogeneousheattreatmentextru-sionprocessingandanodizingwerestudiedfor5056Al-alloybilletscastbyhot-topsemi-con-tinuouscasting．MetallographicanalysisdirectreadingspectrometryandscanningelectronmicroscopewereusedintheresearchbasedonthepracticalproductionprocessofAl-alloypipesintheindustry．Theresultsshowthatthebilletsurfaceandcorearequitedifferentinchemicalcompositionsthatthecoreismorehomogeneousandthesurfaceisslightlyoverburntwhenthebilletishomogenizedat520℃for7handthataberrationappearsonthesur-faceafteranodicoxidationmainlyduetothesegregationlayersqueezedintotheproductsur-faceinextrusion．Keywords5056aluminumalloysegregationhomogenizingannealingextrudedpipesanodizing1、、、、、、、、、、。、、、。、2。13№3。3。11．1OLYMPUS-GX51。、2mol/LNaOH。1．2SEPCTＲOLABM8。1．3JEOL-JSM-6390OXFＲOD-IN-CA250。2258mm5056258mm5056、。50561。15056/%Table1Compositionsof5056aluminiumalloywt/%SiMgFeCuMnCrTiZnAl0．104．710．140．010．080．090．020．01Bal5056→→→→→→→→→→→。4520℃7h、30s、600℃/h。515MNΦ258mm17．6480℃1．0mm/s。33．15056∶∶15∶5∶11。、。3mm。1Fig．1Macrostructureofabillet3．22。3。、。2aαAl+βMg5Al86αAlβMg5Al8。。。3aαAl+FeAl3。14№25056Fig．2Microstructureof5056Al-alloybillets35056SEMFig．3SEMof5056Al-alloybillets2bαAl+Mg2SiβMg5Al8αAl。3b。520℃7h2cMg5Al8。Al-MgMg5Al8αAl+βMg5Al8437℃。2dβMg5Al8Mg2Si。3．3480℃→3mm→→→→。。3mm11mm2。50562。2/%Table2Componentanalysisbythedirectreadingspectrometrywt/%SiMgFeCuMnCrTiZnAl1#0．145．320．240．020．090．090．030．012#0．175．830．330．050．100．090．020．010．104．710．140．010．080．090．020．0121、2Mg、Si、Fe。2Mg、Fe12Mg。5056Mg、Si、Fe。4b12。21。2c、3c520℃7h21mmαAl、Al3Fe、βMg5Al8。15№4。4Fig．4Samplingchart27－9。Ⅰ。ⅡⅢⅡⅢ。3。12ⅡAl3FeⅢMg5Al8121。。。38Table3Intermetalliccompoundsinaluminumalloy8ⅠⅡⅢSiAl12MnFe3SiAl12MnFe3SiAl6MnFeAl3FeMg2Al3Al3TiAl6FeMg5Al8Al6MnFeMg2SiAl9Fe2Si2Al7CrAl2Cu3．450565。5Fig．5Fringesofanodicoxidationinthebox、、、。5mm2～3。6a。6a90μm。6b。16№6Fig．6Picturesofhighmagnification6bFeMgO、Al2O3、SiO2。、。41258mm50563mm。、。25056520℃7h。3、。。1．J．200548－11．2．3M．2005．3．、M．．1990．4．1973J．2010556－63．5．J．200754－8．6．M．2010．7．J．20051027－30．8．J．2010245－48．9．J．20043331－33．10．2J．199861－8．11．6061J．2014247－50．ConstelliumN．VBIWbody-in-white1．67．5。100kt/a201820155。