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Thermoelectric Magnetohydrodynatic Effects on Dictional Solidification Structure of Al-Cu Alloy

Author: LiuQing
Tutor: ZhangWeiQiang
School: Liaoning Technical University
Course: Materials Processing Engineering
Keywords: Bridgemann solidified directionally Convection Thermoelectric Lorentz force the arm spacing
CLC: TG131
Type: Master's thesis
Year: 2002
Downloads: 177
Quote: 3
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Abstract


Because of thermoelectric effects, a local current density appears in dendritic network during the solidification of a liquid metallic alloy. Thus, when a magnetic field is applied, a Lorentz force is created. Two alloys of Al-4.5%Cu and Al-33.2%Cu are solidified directionally in the vertical configuration under a transverse magnetic field with the result that this force enforces fluid flow. The experimental results show that the stronger the flow is, the coarser the dendrite is and the bigger the arm spacing is. Moreover, as the solidification rate increases, the influence of the convection on the dendrite becomes weak. When the magnetic field strength is constant, the dendrite becomes thinner and the arm spacing smaller as the solidification rate becomes bigger. Finally, we establish the moddeling of current which lies in the interface of phase and fluid.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Alloy theory
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