Decagonal quasicrystal growth in chill cast Al72Ni12Co16 alloy

The single-phase decagonal quasicrystal alloy Al72Ni12Co16 was melted by co ntainerless processing and chilled on a copper substrate in an electromagne tic facility. X-ray, TEM, and SEM techniques were used to investigate the m icrostructure and identify the phase composition. The approximately directi onally solidified decagonal quasicrystal in the chill cast sample showed fa cet morphology and grew in a lateral growth mode along the twofold axis nor mal to the plane (00002). The experimental results fit well with the predic tion of Toner's theoretical atomistic growth model. (C) 2000 Elsevier Scien ce Ltd. All rights reserved.