Skip to Main content Skip to Navigation
Journal articles

Dynamic instabilities of rod-like eutectic growth patterns: A real-time study

Abstract : We present a real-time experimental study of the rod-like growth patterns formed during directional solidification in a non-faceted transparent eutectic alloy, succinonitrile–(d)camphor. Slightly convex isotherms were used to slowly increase the pattern spacing k from an appropriate starting value to the threshold spacing for rod elimination or rod-splitting instabilities allowing a quantitative determination of these thresholds as a function of the solidification rate V. We show that the threshold spacing for rod splitting obeys the general k $ V À1/2 scaling law of eutectic growth, whereas the threshold spacing for rod elimination deviates from this law at low V, exhibiting the same overstability effect as previously reported for lamellar eutectic patterns. We demonstrate that topological defects (walls between hexagon domains) play an important role in rod-splitting processes. We also describe a spatially incoherent mode of oscillation that we observed in disordered rod-like patterns.
Document type :
Journal articles
Complete list of metadata

Cited literature [22 references]  Display  Hide  Download
Contributor : Silvère Akamatsu Connect in order to contact the contributor
Submitted on : Thursday, February 23, 2017 - 11:21:05 AM
Last modification on : Monday, May 24, 2021 - 10:40:50 AM
Long-term archiving on: : Wednesday, May 24, 2017 - 12:13:59 PM


Files produced by the author(s)



Mikael Perrut, Sabine Bottin-Rousseau, Gabriel Faivre, Silvère Akamatsu. Dynamic instabilities of rod-like eutectic growth patterns: A real-time study. Acta Materialia, Elsevier, 2013, 61, pp.6802 - 6808. ⟨10.1016/j.actamat.2013.07.054⟩. ⟨hal-01448377⟩



Record views


Files downloads