On the elaboration of composite AlSi$_7$Mg$_{0.6}$/SiC powders and parts by laser powder bed fusion - CEA - Commissariat à l’énergie atomique et aux énergies alternatives
Article Dans Une Revue Journal of Materials Science Année : 2023

On the elaboration of composite AlSi$_7$Mg$_{0.6}$/SiC powders and parts by laser powder bed fusion

Résumé

The present work focuses on the development of Al/SiC materials manufactured by Laser Powder Bed Fusion (L-PBF). More specifically, our goal is to address the issue of the SiC dissolution kinetics, with the objective of preventing or at least limiting SiC decomposition into Al$_4$C$_3$ in melted aluminum. To do so, Al-SiC powder composites with SiC particles of various sizes, namely from circa 35 nm to 4.5 µm, using a standard AlSi$_7$Mg$_{0.6}$ alloy as host material are first successfully prepared, and these composite powders are printed in a standard L-PBF equipment. The resulting parts are then thoroughly characterized. An important result is that only the largest 4.5 µm particles can be partially preserved. These findings are consistent with the results of a diffusion based numerical model, which allows in addition to study the kinetics of powder dissolution as a function of thermophysical and process parameters. A general finding of the present work is that a thermodynamically unstable nanoparticle cannot survive the L-PBF process.

Domaines

Matériaux
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Dates et versions

cea-04287198 , version 1 (15-11-2023)

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Marie-Reine Manlay, Jean-Paul Garandet, Gatien Bacchetta, Mathieu Soulier, Camille Flament. On the elaboration of composite AlSi$_7$Mg$_{0.6}$/SiC powders and parts by laser powder bed fusion. Journal of Materials Science, 2023, 58 (12), pp.5269-5286. ⟨10.1007/s10853-023-08249-1⟩. ⟨cea-04287198⟩
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