Formation of intermetallic delta phase in Al-10Si-0.3Fe alloy investigated by in-situ 4D X-ray synchrotron tomography - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Acta Materialia Année : 2017

Formation of intermetallic delta phase in Al-10Si-0.3Fe alloy investigated by in-situ 4D X-ray synchrotron tomography

J. M. Yu
  • Fonction : Auteur
N. Wanderka
  • Fonction : Auteur
H. Boller
  • Fonction : Auteur
A. Manzoni
  • Fonction : Auteur
A. Vogel
  • Fonction : Auteur
J. Manke
  • Fonction : Auteur

Résumé

During solidification of Fe-containing Al-Si casting alloys, various different intermetallic phases are formed. As this can have an impact on mechanical properties we investigated phase formation by applying in-situ time resolved synchrotron X-ray tomography. For a commercially pure Al-10Si-0.3 wt.% Fe alloy, phase morphology and spatial arrangement during solidification was revealed with 1 degrees C temperature resolution. We find that many of the intermetallic phases that have been identified as beta-AlFeSi phases in previous studies are in fact delta phases. It was found that delta plates mainly nucleate on the eutectic Al and Si. delta phase formation terminates almost simultaneously with the final solidification of eutectic phases. Features of delta phase growth such as impingement, branching and deformation of plates are discussed. The phase separation sequence during solidification is described and explained by the existence of ``cells'' of residual liquid in which delta phase formation progresses rapidly due to the supersaturation of solute atoms. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Dates et versions

hal-01914057 , version 1 (06-11-2018)

Identifiants

Citer

J. M. Yu, N. Wanderka, A. Rack, R. Daudin, H. Boller, et al.. Formation of intermetallic delta phase in Al-10Si-0.3Fe alloy investigated by in-situ 4D X-ray synchrotron tomography. Acta Materialia, 2017, 129, pp.194-202. ⟨10.1016/j.actamat.2017.02.048⟩. ⟨hal-01914057⟩
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