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Additive manufacturing of AlSi10Mg alloy using direct energy deposition: microstructure and hardness characterization

Javidani Mousa, Arreguin-Zavala J., Danovitch J., Tian Y. et Brochu M.. (2017). Additive manufacturing of AlSi10Mg alloy using direct energy deposition: microstructure and hardness characterization. Journal of Thermal Spray Technology, 26, (4), p. 587-597.

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URL officielle: http://dx.doi.org/doi:10.1007/s11666-016-0495-4

Résumé

This paper aims to study the manufacturing of the AlSi10Mg alloy with direct energy deposition (DED) process. ollowing fabrication, the macro- and microstructural evolution of the as-processed specimens was initially investigated using optical microscopy and scanning electron microscopy. Columnar dendritic structure was the dominant solidification feature of the deposit; nevertheless, detailed microstructural analysis revealed cellular morphology near the substrate and equiaxed dendrites at the top end of the deposit. Moreover, the microstructural morphology in the melt pool boundary of the deposit differed from the one in the core of the layers. The remaining porosity of the deposit was evaluated by Archimedes’ principle and by image analysis of the polished surface. Crystallographic texture in the deposit was also assessed using electron backscatter diffraction and x-ray diffraction analysis. The dendrites were unidirectionally oriented at an angle of ~80° to the substrate. EPMA line scans were performed to evaluate the compositional variation and elemental segregation in different locations. Eventually, microhardness (HV) tests were conducted in order to study the hardness gradient in the as-DED-processed specimen along the deposition direction. The presented results, which exhibited a deposit with an almost defect free structure, indicate that the DED process can suitable for the deposition of Al-Si-based alloys with a highly consolidated structure.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1059-9630
Volume:26
Numéro:4
Pages:p. 587-597
Version évaluée par les pairs:Oui
Date:2017
Identifiant unique:10.1007/s11666-016-0495-4
Sujets:Sciences naturelles et génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:additive manufacturing, AlSi10Mg, aluminum alloys, direct energy deposition, fabrication additive, alliages d'aluminium, dépôt d'énergie directe
Déposé le:01 mars 2021 22:38
Dernière modification:01 mars 2021 22:38
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