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APS » Journals » Phys. Rev. Lett. » Volume 77 » Issue 5
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Phys. Rev. Lett. 77, 889–891 (1996)

Spatial Period-Doubling Instability of Dendritic Arrays in Directional Solidification

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W. Losert, B. Q. Shi, and H. Z. Cummins
Department of Physics, City College of the City University of New York, New York, New York 10031

J. A. Warren
Metallurgy Division, Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899

Received 23 February 1996; published in the issue dated 29 July 1996

A directional solidification study of succinonitrile doped with coumarin 152 was performed in which the pulling speed VP was gradually reduced in small steps. A spatial period-doubling instability was observed when VP reached 17.4μm/s, in good quantitative agreement with the prediction of Warren and Langer [Phys. Rev. A 42, 3518 (1990)]. This experiment, in conjunction with two previous studies, conclusively demonstrates the absence of a dynamical selection mechanism for the interdendritic spacing λ1.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.889
DOI:
10.1103/PhysRevLett.77.889
PACS:
68.70.+w, 81.10.Aj, 82.65.Dp
 
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