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<p>Laser Powder Bed Fusion (LPBF) research on aluminum alloys has predominantly focused on commercial Al–Si–Mg systems with modest Mg<sub>2</sub>Si contents, leaving the heat-treatment response of Mg<sub>2</sub>Si-rich compositions largely unexplored. This study investigates, for the first time, the hardness response of an LPBF-tailored aluminum alloy containing 3.94 ma% Mg<sub>2</sub>Si—over twice the equilibrium solid-state solubility limit—and identifies an optimized post-processing route to enhance mechanical performance. Three heat-treatment conditions were investigated: direct aging, solution annealing (SA), and combined solution annealing plus artificial aging (SA + A). Hardness mapping revealed that direct aging at 190&#xa0;°C for 330&#xa0;min achieved the highest hardness of 164 HBW2.5/67.5. The as-built and direct aged conditions were investigated using SEM, EBSD, and TEM to provide a comparative perspective of the microstructural changes that explain the increase in specimen hardness between the two conditions. The as-built state revealed a highly supersaturated α-Al matrix concentrated with early stage Al-, Mg- rich clusters and a refined Si network. In the direct aged condition, nanoscale precipitates were observed, consistent with the precipitation of Mg- and Si-rich phases responsible for the hardening response. The results indicate that the supersaturated solid solution generated during LPBF processing renders a solution-annealing step unnecessary, offering significant reductions in energy consumption. By correlating the heat-treatment routes with the resulting hardness and investigating the increase in hardness by microstructural investigations, this work provides a comprehensive comparison of post-processing routes and offers new insights into designing efficient, and sustainable thermal treatments for high performance aluminum alloys.</p>

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Laser powder bed fusion and heat treatment of a Mg2Si-rich aluminium alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月9日

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  • Keyur Solanki,
  • Paul Lobpreis,
  • Carolin Zinn,
  • Axel von Hehl

摘要

Laser Powder Bed Fusion (LPBF) research on aluminum alloys has predominantly focused on commercial Al–Si–Mg systems with modest Mg2Si contents, leaving the heat-treatment response of Mg2Si-rich compositions largely unexplored. This study investigates, for the first time, the hardness response of an LPBF-tailored aluminum alloy containing 3.94 ma% Mg2Si—over twice the equilibrium solid-state solubility limit—and identifies an optimized post-processing route to enhance mechanical performance. Three heat-treatment conditions were investigated: direct aging, solution annealing (SA), and combined solution annealing plus artificial aging (SA + A). Hardness mapping revealed that direct aging at 190 °C for 330 min achieved the highest hardness of 164 HBW2.5/67.5. The as-built and direct aged conditions were investigated using SEM, EBSD, and TEM to provide a comparative perspective of the microstructural changes that explain the increase in specimen hardness between the two conditions. The as-built state revealed a highly supersaturated α-Al matrix concentrated with early stage Al-, Mg- rich clusters and a refined Si network. In the direct aged condition, nanoscale precipitates were observed, consistent with the precipitation of Mg- and Si-rich phases responsible for the hardening response. The results indicate that the supersaturated solid solution generated during LPBF processing renders a solution-annealing step unnecessary, offering significant reductions in energy consumption. By correlating the heat-treatment routes with the resulting hardness and investigating the increase in hardness by microstructural investigations, this work provides a comprehensive comparison of post-processing routes and offers new insights into designing efficient, and sustainable thermal treatments for high performance aluminum alloys.