In-Situ and Real-Time Investigation of Columnar-to-Equiaxed Transition in Metallic Alloy

H. Nguyen-Thi (1) , G. Reinhart (1) , Nathalie Mangelinck-Noël (1) , H. Jung (1) , B. Billia (1) , T. Schenk (2) , J. Gastaldi (3) , J. Härtwig (4) , J. Baruchel (4)

1 L2MP - Laboratoire matériaux et microélectronique de Provence
2 ENSMN - Ecole Nationale Supérieure des Mines de Nancy
3 CRMCN - Centre de recherche de la matière condensée et des nanosciences
4 ESRF - European Synchrotron Radiation Facility

In this article, we present a review of observations during Al-3.5 wt pct Ni alloy solidification experiments performed at the European Synchrotron Radiation Facility (ESRF) in Grenoble. These experiments provide direct access to dynamical phenomena during columnar growth (initial transient and breakdown of a planar solid-liquid interface), and for the first time to the transition from columnar-to-equiaxed microstructure (nucleation ahead of a columnar front and blocking of a columnar front by an equiaxed microstructure) and fully equiaxed growth (propagation of an effective front). Based on these experimental observations, critical parameters such as columnar growth velocity variation during the transition or equiaxed-grain diameter are measured and discussed.

Domaines: Matériaux

H. Nguyen-Thi, G. Reinhart, Nathalie Mangelinck-Noël, H. Jung, B. Billia, et al.. In-Situ and Real-Time Investigation of Columnar-to-Equiaxed Transition in Metallic Alloy. Metallurgical and Materials Transactions A, 2007, 38 (7), pp.1458 - 1464. ⟨10.1007/s11661-007-9170-1⟩. ⟨hal-01728131⟩