Directional solidification of Pb-Sb alloy assisted by pressure pulses
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Authors
Braz, Joao P. P.
Issue Date
2010
Type
Thesis
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Abstract
Directional solidification processes assisted with pressure pulses were
performed with the goal of producing a novel process capable of introducing
changes in dendritic microstructure morphologies. The alloy used in these
experiments was a Pb-7wt% Sb, with a liquidus temperature of approximately
280°C. Various melt pressure profiles were investigated with maximum pressures
of -266.3 to -1452.8psi and oscillation frequencies ranging from 0 (constant
force) to 7.4Hz. It was found that application of pressure decreased the
secondary dendrite arms spacing (λ2) when compared with the no pressure
experiments and cyclic pressure oscillations cause a resonance effect in the λ2
values when the pressure pulse frequency matches the arms’ natural frequency
of formation. It is not yet clear if this resonance behavior is strong enough or
reliable enough to be of potential interest for industrial applications seeking to
employ novel approaches to controlling microstructural length scales during
directional or equiaxed dendritic solidification processes.
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In Copyright(All Rights Reserved)