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The electromagnetic melting and cyclic superheating method was applied to undercool the Al 72 Ni 12 Co 16 alloy melt, and a maximum undercooling, 180 K 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.
The Electromagnetic melting and cyclic superheating method was applied to undercool the Al 72 Ni 12 Co 16 alloy melt, and a maximum undercooling, 180 K 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.