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Macrosegregation and thermosolutal convection-related freckle formation in directionally solidified Sn−Ni peritectic alloy in crucibles with different diameters

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Transactions of Nonferrous Metals Society of China 2021年第10期31卷 3096-3104页

作者： Peng PENG Sheng-yuan LI Wan-chao ZHENG Li LU Shu-dong ZHOU School of Materials and Energy Lanzhou UniversityLanzhou 730000China Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou UniversityLanzhou 730000China Northwest Rare Metal Materials Research Institute Shizuishan 753000China

Different from other alloys,the observation in this work on the dendritic mushy zone shows that the freckles are formed in two different regions before and after peritectic reaction in directional solidification of Sn−Ni peritectic *** addition,the experimental results demonstrate that the dendritic morphology is influenced by the temperature gradient zone melting and Gibbs−Thomson effects.A new Rayleigh number(Ra_(P))is proposed in consideration of both effects and peritectic *** prediction of Ra_(P) confirms the freckle formation in two regions during peritectic ***,heavier thermosolutal convection in samples with larger diameter is also demonstrated.

关键词： freckle formation directional solidification thermosolutal convection dendritic solidification Sn−Ni peritectic alloy

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The Influence of Natural Convection and Electromagnetically Driven Flows on Segregation freckle formation

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Journal of Iron and Steel Research International 2012年第S1期19卷 459-462页

作者： Shevchenko Natalia Boden Stephan Eckert Sven Gerbeth Gunter Helmholtz-Zentrum Dresden-Rossendorf P.O.Box 51011901314 DresdenGermany

Visualizations of the solidification process were obtained by means of X-ray radioscopy within a Hele-Shaw cell filled with a Ga-25wt%In ***-solutal convection in the solidifying melt gives rise to the development of vertical segregation channels( 'chimneys').The probability of chimney formation depends sensitively on variations of both the concentration and temperature distribution.A forced melt flow perpendicular to the growth direction accelerates the growth of the secondary dendrite arms on the upstream side and suppresses the development of secondary arms on the downstream *** primary dendrite arm spacing is increased,whereas the secondary arm spacing remains unaffected. Flow-induced modifications of the local composition were observed within the mushy zone which may contribute to the formation of spacious segregation pattern.

关键词： solidification melt flow forced convection segregation freckle formation X-ray radiography

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