1 .hltroduetionThe frietion stir welding(FSW)proeess 15 being exten-sively studied beeause itcost AI alloy joints<1、3>、ean produee high一quality and low-foeused on the mechaniealA’arge .n峥黔黔“f lstud‘es havePr0Pertles一J拟IQ Illlcros毛ruc-tural eharaeterizations<8一‘7>of these joints.only a smar-number of studies、vere more or less involved in the frae-ture behavior or loeations of the ioints<4、10>,and some re-SllltS nad a Certaln laC火ot ClaJ.ltV‘一’“or从了efe ColltraQICtory ,.1「月闪1 nl洲1、‘_1「巧}TT_竺!6}___」to eaCll otnerL“一“J上口r eXalnDle,八扭anoneVLJ,且elnZL一」afiQ乙trombec胶L’J Iound all tne Jolnts布Vere tracturea In tne mln-imumhardness heat~a任eeted zones during the tensile tes七s,but they did not elearly point out whether the fraeture oe-eurred on the advaneing side(AS)or on the retreating side(Rs).svensson<91 andM鳍nusson〔‘0〕collfiroed on which。i改of the weld the fraeture oeeurred,but they showed the oPPo-site results. In this ease,it 15 neeessary for us to further investigate thistoPie in order to reveal and understand the effeet of the FSWon the meehanieal behavior of the different AI alloys.There-fore,two tyPes of AI alloys,strain一hardened AAIO50一H24 andPreeiPitate一hardened AA6061一T6,are seleeted as七he exPeri-mental materials for the FSW,and the emPhasis 15 Plaeedon the tensile fraeture loeationcharaeterizations of the jointsand their domlnating长妞三torsoptieal mieroseopy· Prior to the tensile tes七s,the Viekers hardness Pro-files aeross the stir zone,七hermo一meehanieallya旋eted zone(TMAZ),heata赶妞cted zone(HAZ)and partial base materialwere measured along the eenterlines of the eross一seetions ofthe tensile sPeeimens under a load ofo,98 N for 105,and theViekers indents with a spaeing of 1 mm were llsed to determinethe strain distributi。〕ns and fraeture locations of the jointo.The七ensile tests were earried out at room temPerature ata erosshead sPeed of 1 mm/min using a eomputer一eontrolled七es七ing maehine.3 .Results and Diseussion2 .ExPerimental The base materials used in this study weres一mm一thiekAA1050一H24 and AA6061一T6 AI alloy Plates,with the ehem-ieal eomPositions and meehanieal ProPerties listed in Table 1.The Plates were all eut and machined in七0 reetangular weldingsamples,300 mm long by 80 mm wide,and they were longi-tudinally butt一welded using an FSW machine.The welding七001 size and welding parameters used in thee郑eriments areshown in Table 2. After welding,the joints were eross一seetioned perpendie-ular to the welding direetion for the metallographie exam-inations and tensile tests using an eleetrieal一diseharge eut-ting maehine.The eross一seetions of the metallograPhie speei-mens were Polished with an alumina susPension,etehed withKeller,5 re鳍ent(150 mL water,3 mL nitric aeid,6 mL hy-drochlorie aeid and 6 mL hydlofluorie aeid)and observed byt Ph·D.,towhomeorrespondeneeshouldbeaddressed, E一mail:lhj匈wriosaka-u.ac.jP.3 .1几ae亡ure loea衍ons ofj班。亡吕 Figure 1 shows the fra凡,二ure loeations of七he jointswelded at dift毛rent revolutionary Pi七ches,ineluding typiealphoto罗aphs(see Fig·1(a)and(b))and detailod data(seeFig·1(e))·In Fig·1(e),the fraeture loeation 15 expressed bythe distanee between七he fraeture surfaee and the weld een-ter,and the distanee 15 marked as a minus when the fraetureoeeurs on the RS of the从leld. With respeet to AAIOSO一H24,50班e joints are fraeturedon the AS,七he frae七ure loeations are dis七an七from the weldeenter,and the fraeture parts undergo a large amount of de-form掀ion;while oth二joints tend to fraeture on the RS orAS,and the fraeture loea七ions are near to the weld eenter(see Fig·1(a)and(e)). With regard to AA6o61一T6,all the joints are fraeturedon the RS.Some fraeture loeations are distant from the weldeenter and the fraeture surfaees are inelined a eertain degreeto the bottom surfaees of the joi毗s,whileo七her fraeture 10-cations ale near to the weld eenter(see Fig.1(b)and(e)). In addition,it ean also be seen from Fig.1(e)that the frac-ture loeations of the joints change with the FSW Parameters.As the revolutionary piteh inereases,the frae
More abstracts about the Tensile Fracture Location Characterizations of Friction Stir Welded Joints of Different Aluminum All