Examination of the Tensile Deformation Resistance and Ductility of Friction Stir Processed Al-Cu 2218 Alloy at Elevated Temperatures

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  • Chen Ssu-Ta
    Department of Materials Science and Engineering, National Cheng Kung University
  • Lui Truan-Sheng
    Department of Materials Science and Engineering, National Cheng Kung University
  • Chen Li-Hui
    Department of Materials Science and Engineering, National Cheng Kung University

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Tensile properties dependence of elevated testing temperatures (100°C∼450°C) on as extruded and as friction stir processed Al-Cu 2218 alloy were investigated. The tensile deformation resistance of an as friction stir processed sample is higher than an as extruded one as increased testing temperature up to 300°C and this is a consequence of natural aging effect. However, the tensile deformation resistance decreased evidently as the testing temperature raised to 400°C∼450°C, meanwhile there was a concomitant improvement of tensile ductility due to a homogeneously grain refinement which facilitated a pronounced grain boundary sliding in this temperature range.

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