Decoupled versus coupled growth dynamics of an irregular eutectic alloy

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Mohagheghi S., Bottin-Rousseau S., Akamatsu S., Serefoglu M.

SCRIPTA MATERIALIA, cilt.189, ss.11-15, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 189
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.scriptamat.2020.07.053
  • Dergi Adı: SCRIPTA MATERIALIA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, DIALNET, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.11-15
  • Anahtar Kelimeler: Irregular eutectic growth, Directional solidification, Eutectic solidification, Interface dynamics, Solidification microstructures, SOLIDIFICATION, SILICON, LAMELLAR
  • Marmara Üniversitesi Adresli: Hayır

Özet

We present an experimental study of irregular growth patterns observed in real time during thinsample directional solidification of a faceted/nonfaceted eutectic alloy, namely, the transparent 2-amino-2-methyl-1,3-propanediol (AMPD)-succinonitrile (SCN) system. The body-centered cubic SCN crystals are nonfaceted, while monoclinic AMPD crystals grow as faceted needles. At low velocities (<0.3 mu ms(-1)), a decoupled growth regime is observed, during which the tip of the AMPD crystals grows ahead of the SCN-liquid interface. At intermediate velocities, an unsteady coupled-growth regime takes place, with intermittent pinning of triple SCN-AMPD-liquid junctions, and frequent noncrystallographic branching. At higher velocities (>1 mu ms(-1)), two-phase fingers form. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.