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392011Vol．39№42010－09－201973－。60051211．7300502．7481116005。600℃、、、607℃6005610℃、、6005。TG166．3A1007－7235201104－0039－04Overheatingtemperatureandmicrostructurecharacteristicsof6005aluminumalloyZHANGDa-xin12YANGRui-cheng11．CollegeofMaterialsandEngineeringLanzhouUniversityofScienceandTechnologyLanzhou730050China2．ChalcoNorthwestAluminumBranchLongxi748111ChinaAbstractThe6005aluminumalloymicrostructurespecimensselectedfromcastbilletandextrudedproductshavebeeninvestigatedbymicroscope．Thespecimenshavebeensolutionheatedatdeferenttemperatures．Thespecimenshavebeenheatedat600℃andetchedinmixedacidsolutebeforeinvestigation．Theinvestigationresultsshowthatthecompoundsbe-comeroundandaccumulate．Thegrainsgrow．Thegrainboundarytendstostraight．Itindi-catesthatthetemperatureistoohighanddidnotyetreachtooverheat．Alittleoftypicaloverheatcharacteristicsappearedinthespecimensbeingheatedat607℃．Itmeansthisisthestartingtemperatureofoverheatfor6005aluminumalloy．Themicrostructurespecimensbeingheatedat610℃showtypicaloverheatingfeaturessuchasre-melteutecticballsspindle-shapestructuresatthegrainboundarythecoarsegrainboundaryandre-melttrianglegrainboundary．Allthefeaturesshowthat6005aluminumalloyhasbeenoverheatedseriouslyatthistemperature．Keywordstemperaturemicrostructureoverheating6005Al-Mg-Si402011Vol．39№4。。。、、1－4。。6005。11600511。1600516005%SiFeCuMnMgZnTiNiAl0．780．150．0020．0030．520．0040．020．0032RJX-15-9UJ36、。2HF+3HCl+5HNO3+190H2ONeophot。22．1、6005600℃、、、26005。26005600℃412011Vol．39№4607℃600536005。36005607℃610℃、、4。T46005179．5N/mm2172．2N/mm2HB77．954．8。46005610℃618℃、5。610℃、618℃6005。56005618℃422011Vol．39№42．2。6005Al-Mg-SiαAl、Mg2Si、WAlXCuMg5Si4Al-Mg-SiMg2SiMg2Si。Al-Mg2SiMg2Si1．85%。MgSi。60056005。2.360056005、、、。。———。。。、。6005。。6005。36005607℃。609℃。1．M．20051140－1143．2．6020-T8J．2008628－30．3《》．M．197939－45．4《》．M．1975122－125．1414HUANGSTSAIHLINS．Effectofbrazingrouteandbrazingalloyontheinterfacialstructurebetweendia-mondandbondingmatrixJ．MaterialsChemistryandPhysics2004103251－25．15．M．1991．16．M．1998．17．J．200630133－136．18．J．2004910－13．