Abstract
An Fe–30 at% Co hyperperitectic alloy is undercooled in B 2O 3 glass slag to reveal directly the fragments of the primary dendrite. Different morphologies of the fragments have been observed by TEM technique. The fragments of the primary dendrite are isolated in the remaining liquid after recalescence. The mismatch of the crystal structures of the primary phase and the subsequently solidified equilibrium phase makes it possible to have the fragments recognizable after solidification. The relation between the radius of primary trunk and the theoretical tip radius is discussed on the basis of Rayleigh instability.
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