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Title:The Effect of Shear Flow on Solidification Microstructures
Author(s):Chao, Long-Sun
Department / Program:Mechanical Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Mechanical
Engineering, Metallurgy
Engineering, Materials Science
Abstract:Calculations are performed to determine the effect of fluid flow near a solidifying interface on the temperature and concentration fields existing during solidification, and the changes wrought on the microstructure by those fields. The solidification interface position and speed are controlled by two boundary conditions, corresponding to local thermodynamic equilibrium and conservation of mass. A three dimensional model of the solidifying interface is constructed, and the velocity, temperature and concentration fields are calculated for a wide range of alloy compositions and process conditions.
It is demonstrated that solute redistribution, caused by the fluid flow near interface, can be counteracted by changes in the morphology of the solidification interface. The cellular interface is shown to translate into the flow as it advances in the direction of the heat flux vector, the net effect being an inclination of the cells into the flow direction. Microstructures are predicted for several compositions and processing conditions in the Sn-Pb system.
Issue Date:1988
Description:106 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1988.
Other Identifier(s):(UMI)AAI8908647
Date Available in IDEALS:2014-12-15
Date Deposited:1988

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