纯铜作中间层的镁合金与不锈钢扩散-钎焊接头区的微观结构特征（英文）.pdf

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1、Availableonlineatwww．sciencedirect．com，Transactionsof·ScienceDirectNonferrousMetalsSocietyofChinaTrans．NonferrousMet．Soc．China23(2013)599—604www．tnmsc．cnMicrostructuralcharacteristicsofjointregionduringdiffusion—brazingofmagnesiumalloyandstainlessstee

2、lusingpurecopperinterlayerXin-jianYUAN，Guang—minSHENC~JunLUO，JiaLICollegeofMaterialsScienceandEngineering，ChongqingUniversity,Chongqing400044，ChinaReceived21May2012；accepted26September2012Abstract：Anoveljoiningmethod，double—stagediffusion—brazingofanA

3、Z31magnesiumalloyanda304Lausteniticstainlesssteel，wascariedoutLtsingapurecopperinterlayer．Thesolid—statedifusionbondingof304Ltocopperwasconductedat850。Cfor20minfollowedbybrazingtoAZ31at520。Cand495。Cforvarioustime．Microstructuralcharacteristicsofthedif

4、lusion．brazediointswereinvestigatedindetail．AdefectfreeinterfaceofFCudiffusionareaappearedbetweentheCualloyandthe304Lstee1．Cu-MgreactionproductswereformedbetweenAZ31andCualloys．AlayeredstructureincludingAZ31／Cu—Mgcompounds／Cu／Fe—Cudifmsionlayer／304Lwa

5、spresentintheioint．Withtimeprolonging，thereductioninthewidthofCulayerwasbalancedbytheincreaseinthewidthofCu—Mgcompoundszone．MicrohardnesspeaksinthezonebetweenAZ31andCulayerwereattributedtotheformationofMg—Cucompoundsinthiszone．Keywords：magnesiumalloy；

6、stainlesssteel；difsionbonding；brazing；microstructuralcharacteristics；dissimilarmetalsweldingbeendificulttojointogetherbyconventionalfusion1IntrOducti0nweldingbecauseofthesignificantdifferencesbetweenthesetwoalloysinmetallurgical，chemicalandphysicalMag

7、nesiumalloysarethelightestmetallicmaterials，properties[17]．havethelowestdensityandexhibithighspecificstrength，Inviewofthefacts，diffusion—brazingisagoodcorrosionresistance，excellentstiffness，gooddouble-stagejoiningprocess，whichcombinesthecastability，go

8、odnoiseandvibrationdampingcapacitybeneficialfeaturesofdifusionbondingandtransientandfavorablerecyclingcapabillty『1-6]．Theseliquid—phasebondingtechniques．Thisprocesseliminatescharacteristicsmakethisalloyparticularlyattractivefortheadverseinflue