TY - JOUR
T1 - Faceted etch pits formed on surfaces of an icosahedral Al70Pd20Mn10 quasicrystal
AU - Sugawara, Shigeo
AU - Tsai, An Pang
AU - Inoue, Akihisa
AU - Masumoto, Tsuyoshi
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1996/2
Y1 - 1996/2
N2 - An icosahedral Al70Pd20Mn10 quasicrystal was etched under several etching conditions with solutions composed of HF and H2O plus HCl and/or HNO3. The formation of etch pits was examined closely by scanning electron microscopy and replica electron microscopy. When etched for 5 s at 293 K with the etchants of different compositions, the faceted pits were often observed except for a few exceptions. All those pits revealed the similar shape of pentagonal dodecahedron where the pentagonal faces were curved slightly near their corners and edges. By etching for 5 s with a solution of HF+HCl+H2O (1:3:5 in volume ratio), the average size of the pits decreased from 4.5 to 2.5 μm with an increase of etching temperature from 273 to 333 K, and the pentagonal faces tended to be flattened above 313 K. The pentagonal faces near the corners and edges of the pits became more curved and the average size remained unchanged (∼4.5 μm) with increasing etching time in the range of 1 and 20 s at a temperature of 293 K. By comparing the surfaces before and after etching at the same areas, it was concluded that the faceted pits originated from irregular small holes which preexisted on the polished surface.
AB - An icosahedral Al70Pd20Mn10 quasicrystal was etched under several etching conditions with solutions composed of HF and H2O plus HCl and/or HNO3. The formation of etch pits was examined closely by scanning electron microscopy and replica electron microscopy. When etched for 5 s at 293 K with the etchants of different compositions, the faceted pits were often observed except for a few exceptions. All those pits revealed the similar shape of pentagonal dodecahedron where the pentagonal faces were curved slightly near their corners and edges. By etching for 5 s with a solution of HF+HCl+H2O (1:3:5 in volume ratio), the average size of the pits decreased from 4.5 to 2.5 μm with an increase of etching temperature from 273 to 333 K, and the pentagonal faces tended to be flattened above 313 K. The pentagonal faces near the corners and edges of the pits became more curved and the average size remained unchanged (∼4.5 μm) with increasing etching time in the range of 1 and 20 s at a temperature of 293 K. By comparing the surfaces before and after etching at the same areas, it was concluded that the faceted pits originated from irregular small holes which preexisted on the polished surface.
KW - Aluminium-palladium-manganese alloy
KW - Etch pit
KW - Facet
KW - Icosahedral quasicrystal
KW - Replica
KW - Scanning electron microscopy
KW - Transmission electron microscopy
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U2 - 10.2320/matertrans1989.37.115
DO - 10.2320/matertrans1989.37.115
M3 - Article
AN - SCOPUS:0030084410
VL - 37
SP - 115
EP - 120
JO - Materials Transactions
JF - Materials Transactions
SN - 1345-9678
IS - 2
ER -