AZ31B鎂合金的擴(kuò)散連接研究.pdf

1、北京工業(yè)大學(xué)碩士學(xué)位論文AZ31B鎂合金的擴(kuò)散連接研究姓名：王振強(qiáng)申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：夏志東20090501ABSTRACTABSTRACTOwingtoitshighspecificcapabilityAZ31BMgalloywasbecomingpopularformanycriticalengineeringapplicationsinnationaldefensefieldsuchasaeronauti

2、cmanufactureandspaceflightetcExploitingthejoiningtechnologyofAZ31BMgalloyWaSbecomingimportantDiffusionbondingWaSanMvancedprocessesfortheaerospacegroundfieldrecentlyItcanformthejointofperformanceandmicrostrturelikethebase

3、metalItissuitableforthejoiningofdifferentmaterialsThediffusionbondingofAZ31BwithoutinterfacelayerisfeasibleforsuitabletechnologyAtmosphere，surfac圮treatingmethods，temperaturepressuresoakingtimearecriticalparametersThispap

4、eranalysistheinfulenceof觚獬atmosphereonporpertiesofdiffusionbondingofAZ31BalloyjointsTemperatureandsoakingtimemustbesuitableastheotherparametersThepressureshouldbelargestwithoutmacroscopicdeformingofjointsThesuitableparam

5、eterfordiffusionbondingofAZ31BMgalloyis420“C，15MPa3hargonshield400PaThetreatingmethodis：acetonecleaning一1000#sanding—ethanolsupersonicwavecleaning。Cr03corrode’ethanocleanin94airtightcoatingTheshearstrengthof3mmAZ31BMgall

6、oyis285MPaThemicrostrtureofdifferenttemperatureofdiffusionbondingjointsareanalysedThenickisbrittlenessTheXRDofnickincludestzMgandyMgl7All2ItisfeasibleforAZ31BMgalloyand0Crl8Ni9noncorrosivesteelwithoutinterfacelayerinargo

7、nshield400PaTheexperimentresultindicatesthat25MPa，3hdiffusionbondingTheshearstrengthofdiffusionbondingjointsis206MPaThemicrostrtureofjointofAZ31Band0Crl8Ni9Wasobservedat410℃，430℃，450“CThebondinginterfaceofjointsWasobserv

8、edbylinescanningandfacescanningInterfacereactionlayertransitionregionfordeterminationofelementalcomposition，SEMobservationoffracturesurfacesanddeterminationofcompositionwascarriedItWasfoundthatwinlincreasingtemperature，t