MORPHOLOGICAL EVOLUTION OFSOLIDIFICATION MICROSTRUCTURE OF BINARY ALLOY UNDER STIRRING

Acta Metall Sin

2006, Vol. 42

Issue (6): 577-583 DOI:

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MORPHOLOGICAL EVOLUTION OFSOLIDIFICATION MICROSTRUCTURE OF BINARY ALLOY UNDER STIRRING

LI Tao; CHEN Guang; LIN Xin; HUANG Weidong

南京理工大学材料科学与工程系

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LI Tao; CHEN Guang; LIN Xin; HUANG Weidong. MORPHOLOGICAL EVOLUTION OFSOLIDIFICATION MICROSTRUCTURE OF BINARY ALLOY UNDER STIRRING. Acta Metall Sin, 2006, 42(6): 577-583 .

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Abstract Morphological evolutions during the solidification of succinonitrite-5%water(atomic fraction) transparent alloy and Sn-15%Pb mass fraction) alloy under mechanical stirring were investigated experimentally by in situ observation and quenching, separately. The results showed that the primary solidified microstructures have a globular shape when the strong convection was induced by mechanical stirring. According to the morphological stability theory, the formation mechanism of globular microstructure was discussed. The analysis indicated that the rotation of primary microstructure in a shear flow induced a stabilizing effect on the morphological instability at the solid-liquid interface and promoted the globular growth of solidification microstructure.

Key words: convection crystal growth semi-solid processing

Received: 23 September 2005

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I6/577

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