Abstract: The directional solidification structures of the Cu-0.33Cr-0.1Ti hypoeutectic alloy at solidified rate of 20 μm/s were investigated. The morphology and composition of the band-like microstructure were analyzed by means of SEM and EDS. The reason and mechanism of formation of band-like microstructure were discussed based on the dynamics, nucleation conditions. The results showed that the band-like microstructures were formed by the alternation of the monocrystalline α-Cu phase and the (α-Cu)+(β-Cr) eutectic structure. The formation of the band-like microstructure was related to the solute distribution at the front of solid-liquid interface, which was mainly affected by solute concentration, effective solute coefficient and solidification rate and other factors.
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2018, Vol. 32 
