Liquation Cracking of Dissimilar Aluminum Alloys during Friction Stir Welding

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  • Song Sang-Woo
    Industrial Technology Support Division, Korea Institute of Materials Science (KIMS)
  • Lee Sang-Hoon
    Industrial Technology Support Division, Korea Institute of Materials Science (KIMS)
  • Kim Byung-Chul
    National Core Research Center (NCRC) for Hybrid Material Solution, Pusan National University
  • Yoon Tae-Jin
    National Core Research Center (NCRC) for Hybrid Material Solution, Pusan National University
  • Kim Nam-Kyu
    Industrial Technology Support Division, Korea Institute of Materials Science (KIMS)
  • Kim In-Bae
    Department of Material Science & Engineering, Pusan National University
  • Kang Chung-Yun
    National Core Research Center (NCRC) for Hybrid Material Solution, Pusan National University Department of Material Science & Engineering, Pusan National University

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A liquation cracking mechanism of dissimilar Al alloys during the friction stir welding (FSW) is suggested in this study. To identify the mechanism, the precipitates were analyzed and Al-Mg-Cu phase diagrams were calculated. Electron backscattering diffraction (EBSD) analysis and electron probe microanalysis (EPMA) were also conducted. In the same manner as constitutional liquation, at high heating rate, the main liquation-inducing precipitates were not dissolved in the matrix and reacted with Al to form the partially melted zone (PMZ), after which liquation cracking occurred where strain was applied to the PMZ.

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