In situ experiments in microgravity and phase-field simulations of the lamellar-to-rod transition during eutectic growth

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Akamatsu S., Bottin-Rousseau S., ŞEREFOĞLU KAYA M., Witusiewicz V. T., Hecht U., Plapp M.

Comptes Rendus - Mecanique, cilt.351, 2023 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 351
  • Basım Tarihi: 2023
  • Doi Numarası: 10.5802/crmeca.142
  • Dergi Adı: Comptes Rendus - Mecanique
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Communication Abstracts, Geobase, Metadex, zbMATH, Civil Engineering Abstracts
  • Anahtar Kelimeler: Eutectic alloys, In situ experiments, Microgravity, Modeling, Pattern formation, Solidification
  • Marmara Üniversitesi Adresli: Evet

Özet

In recent experiments on the solidification of the binary eutectic alloy succinonitrile-(D)camphor carried out on board of the International Space Station (ISS), a transition from rod to lamellar patterns was observed for low growth velocities. The transition was interpreted in terms of a competition between a propagative instability of lamellae and a drift induced by a transverse temperature gradient. Phase-field simulations of a symmetric model alloy support this scenario: for a fixed transverse temperature gradient, the transition from rods to lamellae occurs for a critical composition at fixed velocity, and for a critical velocity at fixed composition. Since the alloy and control parameters used in experiments and simulations are different, our results strongly suggest that this morphological transition is generic for eutectic alloys.