Unique shapes of micro-pits formed in an Al-Pd-Mn icosahedral quasicrystal by anodic etching

Kaichi Saito, Shigeo Sugawara, Tomonori Sato, Jun Qing Guo, An Pang Tsai

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1221-1225
Number of pages5
JournalMaterials Transactions, JIM
Volume41
Issue number9
DOIs
Publication statusPublished - 2000 Sep

ASJC Scopus subject areas

  • Engineering(all)

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