Unique Shapes of Micro-Pits Formed in an Al–Pd–Mn Icosahedral Quasicrystal by Anodic Etching

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  • Saito Kaichi
    Department of Materials Science and Engineering, Faculty of Engineering and Resource Science, Akita University
  • Sugawara Shigeo
    Department of Materials Science and Engineering, Faculty of Engineering and Resource Science, Akita University
  • Sato Tomonori
    Department of Materials Science and Engineering, Faculty of Engineering and Resource Science, Akita University
  • Guo Jun Qing
    Department of Materials Science and Engineering, Faculty of Engineering and Resource Science, Akita University
  • Tsai An-Pang
    Department of Materials Science and Engineering, Faculty of Engineering and Resource Science, Akita University

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  • Unique Shapes of Micro-Pits Formed in an Al–Pd–Mn Icosahedral Quasicrystal by Anodic Etching

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The shapes of micro-pits formed in an Al–Pd–Mn icosahedral quasicrystal have been examined by alternating sequence of electrochemical etching and scanning electron microscopy (SEM) observations. Anodic etching was executed on fivefold and twofold surfaces of the single-quasicrystal. Prolonged anodic etching in a solution of CH3OH+HNO3 (volume ratio 3 : 1) followed by SEM observations has revealed that two different types of micro-pits, i.e. pre-existing micro-voids and electrochemical etch-pits, develop into the same regular shape. The micro-pits develop into a pentagonal pyramid on the fivefold surface, and a flat-bottomed rhombic pyramid on the twofold surface. It is shown that these two polyhedral etch-figures correspond to two different sections of a regular rhombic triacontahedron.

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