Strongly out-of-equilibrium growth morphologies in fast solidifying eutectics

Physical Review Materials, vol. 6

Abstract

In metal printing processes such as laser-based additive manufacturing, typical solidification velocities yield a strongly out-of-equilibrium (SOE) growth regime that is intermediate between the slow solidification in conventional metal casting and rapid solidification regimes characterized by severe solute trapping. Using phase-field simulations supported by experimental observations, we provide evidence for an inherent growth mode of the SOE regime in slightly hypereutectic Al-Ni, leading to the destabilization of the planar eutectic coupled growth front and the development of a protruded state. We interpret this scenario theoretically in terms of a concomitant growth of different solidification modes, here the coupled eutectic together with $\ensuremath{\alpha}$ primary phase. As another example of concomitant growth under SOE conditions, we present simulation results for single-phase solidification of a Ni fcc-phase exhibiting dendrites and doublons.

Authors 4

1. G. Boussinot Aachen Access e.V

   Access

   Affiliation as printed

   Access e.V., Intzestr. 5, 52072 Aachen, Germany

2. Markus Döring

   Friedrich-Alexander-Universität Erlangen-Nürnberg

   Affiliation as printed

   Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordan-Strasse 6, 91052 Erlangen, Germany

   Institut of Photonic Technologies (LPT), Friedrich-Alexander UniversitŁt Erlangen-Nrenberg, Konrad-Zuse-Str.3-5, 91052 Erlangen, Germany

3. Michael Schmidt

   Friedrich-Alexander-Universität Erlangen-Nürnberg

   Affiliation as printed

   Erlangen Graduate School in Advanced Optical Technologies (SAOT), Paul-Gordan-Strasse 6, 91052 Erlangen, Germany

   Institut of Photonic Technologies (LPT), Friedrich-Alexander UniversitŁt Erlangen-Nrenberg, Konrad-Zuse-Str.3-5, 91052 Erlangen, Germany

4. Markus Apel Aachen Access e.V

   Access

   Affiliation as printed

   Access e.V., Intzestr. 5, 52072 Aachen, Germany