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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 6    December 2002

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Growth morphologies of decagonal quasicrystal in highly undercooled Al72Ni12Co16alloy melt
LIU Xin-bao(刘新宝), YANG Gen-cang(杨根仓),FAN Jian-feng(樊建锋),
WANG Jin-cheng(王锦程),SONG Guang-sheng(宋广生)

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University,Xi′an 711072, China

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.

 

Key words:   Al72Ni12Co16; high undercooling; decagonal quasicrystal; growth morphology

ISSN 1672-7029
CN 43-1423/U

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