Al扩散焊接头微观组织和性能的影响.pdf

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1、Availableonlineatwww．sciencedirect。com．一一，Transaction$of·：：ScienceDirectNonferrousMetals登SocietyofChinaPressTrans．Nonfe1TOUSMet．Soc．China22(2012)1961—1966www．tnmsccnEffectofjoiningtemperatureonmicrostructureandpropertiesofdiffusionbondedMg／A1jointsSHANGJing，WANGKe-hong，ZHOUQi，ZHAN

2、GDe-ku，HUANGJun，GEJia—qiSchoolofMaterialsScienceandEngineering，NanjingUniversityofScienceandTechnology,Nanjing210094，ChinaReceived10November2011；accepted27April2012Abstraet：TheipiningofAZ31BMgalloyto6061Alalloywasinvestigatedatdifferentipiningtemperaturesbyvacuumdiffusionbondingme

3、thod．ThemicrostructuresofMg／A1dissimilaripintswerestudiedbymeansofopticalmicroscopyfOM)，scanningelectronmicroscopy(SEM)andenergydispersiveX—ray(EDX)．Theresultsshowthatthethicknessofeachlayerinthediffusionzoneincreaseswiththeincreaseofipiningtemperature，andthemicrostructurechangeso

4、bviously．Atpiningtemperatureof440。C，thediffusionzoneiscomposedofMg2A13layerandMgI7All2layer．Atjoiningtemperaturesof460and480。C，thediffusionzoneiscomposedofMg2A13layer，MglTA112layer，eutecticlayerofMglTA112andMg—basedsolidsolution．Thewidthofhigh-hardnesszoneintheiointincreaseswithin

5、creasingipiningtemperature，andthemicro—hardnessesatdifferentlocationsinthediffusionzonearesignificantlydiferent．Thejpiningtemperatureof440。Cofersthehighesttensilestrengthof37MPa，andthecorrespondingjointexhibitsbrittlefractureattheintermetalliccompound1ayerofMg17Al17．Keywords：vacuu

6、mdiflusionbonding；6061aluminumalloy；AZ31magnesiumalloy；dissimilarmetalipint；microstructure；mechanicalpropertypreciselyregulatetheheatingtemperatureandholdinglIntrOductiOntime．andthencon打O1thegenerationofintermetalliccompounds『12，131．ThedissimilarmaterialsofTi／AlAsiswellknownthatma

7、gnesiumalloysandandFe3Al／Q235havebeenbondedsuccessfullybyalummumalloysarewidelyusedinaviation，aerospace，meansofvacuumdiffusionbonding[14，15]．Inthiswork，automotive．machinery,electrica1andchemicalindustry．vacuumdiffusionbondingwasusedtostudytheintema1deandcrossapplicationofthesetwom

8、etalsmakesrelationsbetweenwelding