Effect of withdrawal velocity on dendritic interfacial characteristic for Al-Cu alloy during directional solidification

Acta Metall Sin

2008, Vol. 44

Issue (9): 1051-1056 DOI:

Research Articles

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Effect of withdrawal velocity on dendritic interfacial characteristic for Al-Cu alloy during directional solidification

Min Qu;Lin LIU;;;

西北工业大学凝固技术国家重点实验室

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Min Qu; Lin LIU. Effect of withdrawal velocity on dendritic interfacial characteristic for Al-Cu alloy during directional solidification. Acta Metall Sin, 2008, 44(9): 1051-1056 .

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Abstract Directional solidification experiments were carried out on Al-4wt%Cu alloy under different withdrawal velocities. It is showed that the primary dendrite arm spacing decreases with increasing withdrawal velocity which is rapid. The solid/liquid interface of dendrite is planar-convex-planar-convex, and it is reinforced first and then weakened and finally almost faded. Dendrite tip temperature is also first increased and then decreased with increasing withdrawal velocity. The KGT model and non-equilibrium effect were used to research the dendrite tip temperature, tip undercooling and composition. This explains the change of dendrite interface morphology well.

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Received: 14 January 2008

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2008/V44/I9/1051

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