Grain refinement and superplasticity of pipes processed by high-pressure sliding

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  • Yongpeng Tang
    Department of Materials Science and Engineering, Kyushu University, Fukuoka, Japan
  • Koki Matsuda
    Department of Materials Science and Engineering, Kyushu University, Fukuoka, Japan
  • Yoichi Takizawa
    Technology Department, Nagano Forging Co., Ltd, Nagano, Japan
  • Manabu Yumoto
    Technology Department, Nagano Forging Co., Ltd, Nagano, Japan
  • Yoshiharu Otagiri
    Technology Department, Nagano Forging Co., Ltd, Nagano, Japan
  • Zenji Horita
    Department of Materials Science and Engineering, Kyushu University, Fukuoka, Japan

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<jats:p> The high-pressure sliding (HPS) process was applied for grain refinement of a pipe form of an Al-3wt%Mg-0.2wt%Sc alloy by developing two types of straining techniques (called in this study anvil sliding and mandrel sliding). To achieve a homogeneous microstructure throughout the cross-section of the pipe, the sample is rotated around the longitudinal axis every after sliding operation by introducing multi-pass technique, named multi-pass HPS (MP-HPS) as developed earlier for rods. The MP-HPS-processed sample shows ultrafine-grained structures with an average grain size of ∼260 and ∼300 nm after the HPS processing using anvil sliding and mandrel sliding. The samples also exhibit superplasticity with total elongations well more than 400%, respectively. A finite-element method is used to simulate the evolution of strain in the HPS processing and demonstrates that the simulation well represents the experimental results. </jats:p>

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