Growth morphologies of decagonal quasicrystal in highly undercooled Al72Ni12Co16alloy melt
来源期刊：中国有色金属学报(英文版)2002年第6期
论文作者：刘新宝 杨根仓 樊建锋 王锦程 宋广生
文章页码：1131 - 1134
Key words：Al72Ni12Co16; high undercooling; decagonal quasicrystal; growth morphology
Abstract: The electromagnetic melting and cyclic superheating method was applied to undercool the Al72Ni12Co16 alloy melt, and a maximum undercooling, 180K was obtained. Growth morphologies were characterized by using optical microscopy, scanning electron microscope(SEM) and transmission microscopy(TEM). The microstructural morphologies indicate that a continuous growth mode of D-phase along the periodic orientation of ten-fold axis is preferred at large undercoolings. According to the Toner’s step growth mode of quasicrystal, the preferred continuous growth along the periodic orientation of ten-fold axis is caused by the loss of potential barrier for nucleating steps along this direction.
