Laser Powder Bed Fusion of Alumina: Effects of Scanning Strategies on External and Internal Defects
Abstract
This study investigates the surface and internal microstructures of pure alumina fabricated via laser powder bed fusion, focusing on the influence of different scanning strategies on external and internal structures. Two scanning strategies were evaluated: linear 45° and island concentric out‐in, utilizing optimized laser power and scanning speed parameters. The linear 45° strategy produced a smooth, uniform external surface but exhibited significant defects, including cracks and pores, which were attributed to thermal shocks and the low wettability of molten alumina. The internal structure displayed high porosity and closed voids, limiting the effectiveness of post‐processing techniques like infiltration to enhance the relative density. Conversely, the island concentric out‐in strategy generated a distinct surface morphology with regularly distributed holes, resulting from localized heat accumulation at island centers. Internally, this strategy produced vertical through‐holes extending across multiple layers and dense regions away from the island centers, contributing to a higher overall relative density than the linear 45° strategy. These through‐holes offer potential for improved post‐processing, especially infiltration, to enhance relative density. The study highlights the need for further optimization, suggesting that a hybrid scanning strategy may help eliminate defects and achieve a fully dense structure throughout the fabricated alumina parts.
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BibTeX
@article{abdelmoula2026laser,
title = {{Laser Powder Bed Fusion of Alumina: Effects of Scanning Strategies on External and Internal Defects}},
author = {Mohamed Abdelmoula and Gökhan Küçüktürk and Duran Kaya and David Grossin and Christophe Tenailleau and Benjamin Duployer and Enrique Juste and Fabrice Petit},
journal = {Advanced Engineering Materials},
year = {2026},
month = may,
doi = {10.1002/adem.202501371},
url = {https://hal.science/hal-05780825v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Laser Powder Bed Fusion of Alumina: Effects of Scanning Strategies on External and Internal Defects
AU - Mohamed Abdelmoula
AU - Gökhan Küçüktürk
AU - Duran Kaya
AU - David Grossin
AU - Christophe Tenailleau
AU - Benjamin Duployer
AU - Enrique Juste
AU - Fabrice Petit
PY - 2026
DA - 2026/05/22
JO - Advanced Engineering Materials
DO - 10.1002/adem.202501371
UR - https://hal.science/hal-05780825v1
AB - This study investigates the surface and internal microstructures of pure alumina fabricated via laser powder bed fusion, focusing on the influence of different scanning strategies on external and internal structures. Two scanning strategies were evaluated: linear 45° and island concentric out‐in, utilizing optimized laser power and scanning speed parameters. The linear 45° strategy produced a smooth, uniform external surface but exhibited significant defects, including cracks and pores, which were attributed to thermal shocks and the low wettability of molten alumina. The internal structure displayed high porosity and closed voids, limiting the effectiveness of post‐processing techniques like infiltration to enhance the relative density. Conversely, the island concentric out‐in strategy generated a distinct surface morphology with regularly distributed holes, resulting from localized heat accumulation at island centers. Internally, this strategy produced vertical through‐holes extending across multiple layers and dense regions away from the island centers, contributing to a higher overall relative density than the linear 45° strategy. These through‐holes offer potential for improved post‐processing, especially infiltration, to enhance relative density. The study highlights the need for further optimization, suggesting that a hybrid scanning strategy may help eliminate defects and achieve a fully dense structure throughout the fabricated alumina parts.
SN - 1438-1656
SN - 1527-2648
ER -