Article Dans Une Revue Scripta Materialia Année : 2022

Coexistence of rod-like and lamellar eutectic growth patterns

Résumé

We present the first observations of a large-scale coexistence between rod-like and lamellar eutectic growth patterns during directional solidification of a eutectic alloy. In situ experiments with real-time optical monitoring were carried out under microgravity onboard the International Space Station (ISS). We used the transparent succinonitrile-d,camphor eutectic alloy that ordinarily forms rod-like patterns. At low growth velocity, short lamellae stabilized at the contact line with a sample glass wall. In the presence of a controlled transverse temperature gradient, the coupled-growth pattern experienced a global drift along an inclined isotherm, and a stable lamellar domain spread over the solidification front. The propagative nature of the lamellar-to-rod transition was evidenced. The advance of the lamellar/rod domain boundary was determined by a slowly amplifying varicose instability of the lamellae. On a large scale, the domain boundary underwent a dynamic faceting.

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hal-03354466 , version 1 (25-09-2021)

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Sabine Bottin-Rousseau, Victor T Witusiewicz, Ulrike Hecht, Jose Fernandez, Ana Laveron-Simavilla, et al.. Coexistence of rod-like and lamellar eutectic growth patterns. Scripta Materialia, 2022, 207, pp.114314. ⟨10.1016/j.scriptamat.2021.114314⟩. ⟨hal-03354466⟩
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