TY - JOUR
T1 - Shear stabilization of morphological instability during directional solidification
AU - Schulze, T. P.
AU - Davis, S. H.
N1 - Funding Information:
This work was supportedb y grants from the National Aeronauticsa nd Space Administration throught he GraduateS tudentR esearcherPsr o-gram (TPS) and the Program on Microgravity Sciencea ndA pplications(S HD). We are grateful to S.R. Coriell for bringingt o our attentiont he work of Delves \[2\].
PY - 1995/4/2
Y1 - 1995/4/2
N2 - A linear stability analysis is performed on the interface formed during the directional solidification of a dilute binary alloy in the presence of a time-periodic flow. In general, the flow is generated by translating the crystal relative to the far-field flow in elliptical orbits parallel to the interface. The presence of this complex, unsteady flow can either stabilize or destabilize the system relative to the case without flow, with the result depending on the frequency and amplitude of the oscillations as well as the properties of the material. We find, however, that proper selection of the frequency and amplitude of the modulation, both physically realizable, can eliminate the possibility of morphological instability for a significant range of solute concentrations.
AB - A linear stability analysis is performed on the interface formed during the directional solidification of a dilute binary alloy in the presence of a time-periodic flow. In general, the flow is generated by translating the crystal relative to the far-field flow in elliptical orbits parallel to the interface. The presence of this complex, unsteady flow can either stabilize or destabilize the system relative to the case without flow, with the result depending on the frequency and amplitude of the oscillations as well as the properties of the material. We find, however, that proper selection of the frequency and amplitude of the modulation, both physically realizable, can eliminate the possibility of morphological instability for a significant range of solute concentrations.
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U2 - 10.1016/0022-0248(94)00832-9
DO - 10.1016/0022-0248(94)00832-9
M3 - Article
AN - SCOPUS:0000179812
SN - 0022-0248
VL - 149
SP - 253
EP - 265
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 3-4
ER -