Effect of Pore Morphology on Compressive Yield Strength of Lotus-Type Porous Copper with Various Specimen Sizes

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  • Park Jae-Soung
    The Institute of Scientific and Industrial Research, Osaka University
  • Hyun Soong-Keun
    The Institute of Scientific and Industrial Research, Osaka University
  • Sueno Hidekazu
    The Institute of Scientific and Industrial Research, Osaka University
  • Tane Masakazu
    The Institute of Scientific and Industrial Research, Osaka University
  • Nakajima Hideo
    The Institute of Scientific and Industrial Research, Osaka University Division of Advanced Materials Engineering, Gyeong-Sang National University
  • Um Yong-Su
    Division of Advanced Materials Engineering, Gyeong-Sang National University
  • Hur Bo-Young
    Division of Advanced Materials Engineering, Gyeong-Sang National University
  • Ono Fumio
    The New Materials Center, Osaka Science & Technology Center

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Lotus-type porous copper with long cylindrical pores aligned in one direction parallel to the solidification direction was fabricated by unidirectional solidification of the melt in a mixed gas of hydrogen and argon. Compression tests were performed in the direction parallel to the cylindrical pores in order to investigate the relationship between the specimen size and compressive yield strength. The compressive yield strengths and the standard deviation decrease with an increase in specimen size. Increments of the standard deviation are caused by the standard deviation of porosity occurred by inhomogeneous pore diameter and irregular pore arrangement.

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