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Phys Rev Lett. 2004 Sep 17;93(12):126105. Epub 2004 Sep 16.

Cumulative mechanical moments and microstructure deformation induced by growth shape in columnar solidification.

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1
L2MP, Université Paul Cézanne-Aix-Marseille III (UMR CNRS n degrees 6137), Faculté des Sciences de Saint-Jérôme, Case 142, 13397 Marseille Cedex 20, France.

Abstract

The dynamical interaction between columnar interface microstructure and self-stress, resulting in unforeseen mechanical deformation phenomena, is brought to light by means of in situ and real-time synchrotron x-ray topography during directional solidification of dilute aluminum alloys. Beyond long-known local mechanical stresses, global mechanical constraints are found to be active. In particular, column rotation results from deformation caused by the mechanical moments associated with the very growth shape, namely, the cumulative torque acting together with the cumulative bending moment under gravity. A basic model allowing for a qualitative explanation of the observed distinctive features of the self-stress effects on microstructure dynamics is proposed.

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