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Feedback control of unstable cellular solidification fronts
Pons, A.J.; Karma, A.; Akamatsu, S.; Newey M.; Pomerance, A.; Singer, H.; Losert, W.
Universitat de Barcelona
We present a feedback control scheme to stabilize unstable cellular patterns during the directional solidification of a binary alloy. The scheme is based on local heating of cell tips which protrude ahead of the mean position of all tips in the array. The feasibility of this scheme is demonstrated using phase-field simulations and, experimentally, using a real-time image processing algorithm, to track cell tips, coupled with a movable laser spot array device to heat the tips locally. We demonstrate, both numerically and experimentally, that spacings well below the threshold for a period-doubling instability can be stabilized. As predicted by the numerical calculations, cellular arrays become stable with uniform spacing through the feedback control which is maintained with minimal heating.
Ciència dels materials
Equacions d'estat
Regla de les fases i equilibri
Ciència dels materials
Materials science
Equations of state
Phase rule and equilibrium
(c) American Physical Society, 2007
The American Physical Society

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