GROWTH MORPHOLOGIES OF QUASICRYSTALLINE PHASE IN A BULK UNDERCOOLED Al-Mn-(Si,B) ALLOY

来源期刊：中国有色金属学报(英文版)1998年第2期

论文作者：Song Guangsheng Yang Gencang Zhou Yaohe

文章页码：206 - 210

Key words：Al-Mn-(Si,B);　high undercooling;　quasicrystalline phase;　growth morphology

Abstract: The complex method of glass covering, salt denucleating and multiple superheating-cooling has been successfully applied to undercool the melt of a bulk Al-Mn-(Si,B) alloy and initiate quasicrystalline phase at an undercooling of 100 K. Growth morphologies of the quasicrystalline phase were characterized by using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). SEM and TEM imagies indicate 5-fold and 3-fold symmetric faceting dendrites, and dendrite elements and polyhedron particles, respectively. The constitution level and relation to m3 5 point group symmetry of growth morphology for the undercooled quasicrystalline phase have been reported for the first time.