超声辅助铝/钛搅拌摩擦搭接接头的成形和组织
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摘要
借助超声波辅助的方法对铝/钛异种合金进行搅拌摩擦搭接,研究超声波作用对接头的成形和组织的影响.结果表明,当超声波施加在铝板时,接头的钩状缺陷较高,且会出现孔洞缺陷;当超声施加在钛板时,接头无缺陷.超声振动能够增大铝/钛界面扩散层的厚度,对接头性能的提高起到一定的促进作用.当搅拌头转速为300 r/min时,界面扩散层厚度较薄;当搅拌头转速升高至500 r/min时,界面生成一层厚度约为1μm的金属间化合物.超声辅助焊接可明显提高接头的断裂载荷.
This work used ultrasonic-assisted friction stir lap welding to join dissimilar Al/Ti alloys. The effect of ultrasonic vibration on joint formation and microstructure was mainly studied. Results show that void appeared inside the joint when the ultrasonic vibration was applied on the Al sheet.Defect-free joint was obtained when the ultrasonic vibration was applied on the Ti sheet. Ultrasonic vibration could enhance the diffusion at the Al/Ti interface, which was beneficial for joint mechanical properties. The thickness of the diffusion layer was rather thin at the rotating speed of 300 r/min. An intermetallic compound with a thickness of 1 μm was obtained at the rotating speed of 500 r/min. The application of ultrasonic could significantly increase the failure load of the joint.
This work used ultrasonic-assisted friction stir lap welding to join dissimilar Al/Ti alloys. The effect of ultrasonic vibration on joint formation and microstructure was mainly studied. Results show that void appeared inside the joint when the ultrasonic vibration was applied on the Al sheet.Defect-free joint was obtained when the ultrasonic vibration was applied on the Ti sheet. Ultrasonic vibration could enhance the diffusion at the Al/Ti interface, which was beneficial for joint mechanical properties. The thickness of the diffusion layer was rather thin at the rotating speed of 300 r/min. An intermetallic compound with a thickness of 1 μm was obtained at the rotating speed of 500 r/min. The application of ultrasonic could significantly increase the failure load of the joint.
引文
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[2]岳玉梅,周振鲁,姬书得,等.半螺纹搅拌针对2024铝合金搅拌摩擦搭接焊力学性能的影响[J].焊接学报,2016,37(10):69-72.Yue Yumei,Zhou Zhenlu,Ji Shude,et al.Effect of half-threaded pin on mechanical properties of friction stir lap welded alclad 2024aluminum alloy[J].Transactions of the China Welding Institution,2016,37(10):69-72.
[3]Chen Y C,Nakata K.Microstructural characterization and mechanical properties in friction stir welding of aluminum and titanium dissimilar alloys[J].Materials&Design,2009,30(3):469-474.
[4]Chen Z W,Yazdanian S.Microstructures in interface region and mechanical behaviours of friction stir lap Al6060 to Ti-6Al-4Vwelds[J].Materials Science and Engineering:A,2015,634:37-45.
[5]Wei Y,Li J,Xiong J,et al.Joining aluminum to titanium alloy by friction stir lap welding with cutting pin[J].Materials Characterization,2012,71:1-5.
[6]Ji S,Meng X,Liu Z,et al.Dissimilar friction stir welding of 6061aluminum alloy and AZ31 magnesium alloy assisted with ultrasonic[J].Materials Letters,2017,201:173-176.
[7]Liu X C,Wu C S,Padhy G K.Improved weld macrosection,microstructure and mechanical properties of 2024Al-T4 butt joints in ultrasonic vibration enhanced friction stir welding[J].Science and Technology of Welding and Joining,2015,20:4,345-352.
[8]Meng X,Jin Y,Ji S,et al.Improving friction stir weldability of Al/Mg alloys via ultrasonically diminishing pin adhesion[J].Journal of Materials Science&Technology,2018,34(10):1817-1822.
[9]Huang Y,LüZ,Wan L,et al.A new method of hybrid friction stir welding assisted by friction surfacing for joining dissimilar Ti/Al alloy[J].Materials Letters,2017,207(15):172-175.