umdeformedtohighstrainandannealed[J].ActaMateria⁃lia，2009，57（14）：4198-4208.[14]GrabskiMW.TheHall-Petchrelationinaluminiumanditsdependenceonthegrainboundarystructure[J].Philosophi⁃calMagazineA，1986，53（4）：505-520.[15]SULH，LUC，TIEUAK，etal.Vacancy-assistedhard⁃eninginnanostructuredmetals[J].MaterialsLetters，2011，65（3）：514-516.Effectofexternalelectricfieldheattreatmentonmicrostructureandpropertiesofequaldiameterangularextrusion1050aluminumalloySunKeming2,YuLiming1,QianWeitao1(1.TangshanNormalUniversity,OceanCollege,Tangshan063000;2.SchoolofMaterialsScienceandEngineering,TianjinUniversity,Tianjin300072,China）Abstract:Inthispaper,experimentalmethodssuchasEBSDtest,tensiletestandPALStestwereusedtostudythethermaldynamicsandmicrostructurecharacteristicsof1050aluminumalloyunderconstantdiameterangularextrusionatlowtemperature.Afteranneal⁃ingatdifferenttemperatures(150~400℃)withcurrentandwithoutcurrent,thedifferencesbetweenthermaldynamicsandmicrostruc⁃turecharacteristicsof1050aluminumalloywerecompared.Onthebasisoftheexperimentalresults,theeffectmechanismofdifferentannealingtemperatureonthemicrostructureandpropertiesofthematerialswasdiscussed.Theresultsshowthatwhentheannealingtemperatureis150~250℃,theyieldstrengthofthesamplewithappliedcurrentdecreasesby8.1%~11.2%comparedwiththatwithoutappliedcurrent.Asaresult,thegrainboundarystructurewithlargeorientationAngleof3°~7°accountsforalargerproportion,thein⁃ternalenergyincreases,andtheinternalstructureofthegrainboundarywithlargeorientationAngleisunstable.At300~400℃,theyieldhardnessofsamplesannealedwithoutDCisdecreasedmoresignificantlyandfasterthanthatannealedwithDC.ThegrainsizeofsamplesannealedwithoutDCisalsoincreasedrapidlyto(6.4~22.4μm).Thegrainlengthofthesampleissmallerthanthatofthesam⁃plewithoutdirectcurrent,sotheyieldstrengthishigher.Keywords:electricfield;aluminumalloy;heattreatment;microstructureandproperties大连理工&江苏大学增材顶刊：新方法！实现600MPa铝合金复合增材制造由于Al-Zn-Mg-Cu合金较大的凝...
