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Article Dans Une Revue IOP Conference Series: Materials Science and Engineering Année : 2015

Lamellar eutectic growth with anisotropic interphase boundaries

Résumé

We present a numerical study of the effect of a free-energy anisotropy of the solid-solid interphase boundaries on the formation of tilted lamellar microstructures during directional solidification of nonfaceted binary eutectic alloys. We used two different methods – phase-field (PF) and dynamic boundary-integral (BI) – to simulate the growth of periodic eutectic patterns in two dimensions. For a given Wulff plot of the interphase boundary, which characterizes a eutectic grain with a given relative orientation of the two solid phases, the lamellar tilt angle depends on the angle between the thermal axis z and a reference crystallographic axis. Both PF and BI results confirm the general validity of a recent approximate theory which assumes that, at the trijunctions, the surface tension vector of the interphase boundary is parallel to z. In particular, a crystallographic locking of the lamellae onto a direction close to a deep minimum in the Wulff plot is well reproduced in the simulations.
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Dates et versions

hal-01469035 , version 1 (16-02-2017)

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S Akamatsu, S Bottin-Rousseau, G Faivre, S Ghosh, M Plapp. Lamellar eutectic growth with anisotropic interphase boundaries. IOP Conference Series: Materials Science and Engineering, 2015, 84, pp.012083. ⟨10.1088/1757-899X/84/1/012083⟩. ⟨hal-01469035⟩
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