Dissolution patterns essential for Al-Co-Cu and Al-Co-Ni decagonal quasicrystals (d-QCs) have been investigated in detail by chemical etching using a HF-HNO3-H2O solution followed by scanning electron microscopy (SEM) observations. The chemical etching of definite surface areas of the samples, which are either normal or parallel to the tenfold axes, using a solution with HF-HNO3-H2O (1:5:4 in volume ratio; 0°C; 5-10min), produces a large number of microfacet pits of decagonal prismatic shape. In addition, the same etching test in combination with SEM observations was carried out on a deformed sample of the Al-Co-Ni d-QC, which had been subjected to concentrated mechanical stress at an elevated temperature of 850°C by means of the Vickers indentation technique. The morphological features of the resulting micropits and their possible origins are discussed on the basis of results obtained by SEM observations.
ASJC Scopus subject areas
- Condensed Matter Physics