Abstract
This work demonstrates two phenomena both grain refinement and the proportion of twin boundaries increase from 0.3% for a randomly oriented regular FCC grain to 2.36% in equiaxial solidified Al-0.2wt%Ti alloy. Five adjacent grains exhibiting twin relationships share the common 〈1 1 0〉 direction and demonstrate a fivefold symmetry axis. This special symmetry relationship gives a new light on twin grain nucleation. An abundant icosahedron in the melting is constituted of twenty regular tetrahedrons. Thus, icosahedral quasicrystal would play a role of bridge between icosahedral cluster and crystal nucleus to significantly promote nucleation.
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