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Preferred growth orientation and microsegregation behaviors of eutectic in a nickel-based single-crystal superalloy. | LitMetric
A nickel-based single-crystal superalloy was employed to investigate the preferred growth orientation behavior of the ( + ') eutectic and the effect of these orientations on the segregation behavior. A novel solidification model for the eutectic island was proposed. At the beginning of the eutectic island's crystallization, the core directly formed from the liquid by the eutectic reaction, and then preferably grew along [100] direction. The crystallization of the eutectic along [110] always lagged behind that in [100] direction. The eutectic growth in [100] direction terminated on impinging the edge of the dendrites or another eutectic island. The end of the eutectic island's solidification terminates due to the encroachment of the eutectic liquid/solid interface at the dendrites or another eutectic island in [110] direction. The distribution of the alloying elements depended on the crystalline axis. The degree of the alloying elements' segregation was lower along [100] than [110] direction with increasing distance from the eutectic island's center.
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