M. Doblinger et al., Structural relationship and mutual transformation of approximants of the decagonal Al-Co-Ni phase, MAT SCI E A, 294, 2000, pp. 131-134
Apart from the decagonal phase, several different approximant structures we
re observed in the Al-Co-Ni alloy system. In this work, specimens with a co
mposition of Al71Co14.5Ni14.5 are investigated by conventional acid high-re
solution transmission electron microscopy. The structural relationships bet
ween two approximant phases are studied in detail. Simplified atomic models
of these structures are derived from high-resolution electron microscopy a
nd verified by image contrast simulation. A transition between the two appr
oximants is possible by changing only a few atomic positions. Nevertheless,
these minor changes are sufficient to produce rather striking changes in h
igh-resolution electron microscopy images. (C) 2000 Elsevier Science B.V. A
ll rights reserved.