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Abstract <p>The laser powder bed fusion process imparts a unique microstructure to the age-hardenable AlSi10Mg alloy, known for its distinct properties. The fully cellular structure of eutectic Si governs both the work hardening behavior and the strengthening mechanisms, despite the occurrence of precipitation phenomenon. This study emphasizes the importance of using samples with a networked microstructure, rather than a composite-like microstructure, under loading conditions. AlSi10Mg samples were laser powder bed-fused onto a substrate preheated to 150&#xa0;°C and then subjected to direct and artificial aging at 150&#xa0;°C and 175&#xa0;°C. The precipitation phenomena characterizing the AlSi10Mg samples with a networked microstructure did not significantly affect their uniform elongation values or work hardening capabilities. However, the best hardening performance was observed in samples where build platform preheating prevented precipitate formation. For enhanced deformation characteristics with lower energy consumption, AlSi10Mg samples should exhibit a composite-like microstructure in the solution heat-treated conditions (505&#xa0;°C for 4&#xa0;h). Precipitates formed at peak aging during artificial aging significantly reduced their work hardening ability, although some recovery was observed during over-aging. </p> Graphical abstract <p></p>

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Variations of uniform elongations and work hardening of laser powder bed-fused AlSi10Mg during exposure to operating temperatures

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Emanuela Cerri,
  • Emanuele Ghio

摘要

Abstract

The laser powder bed fusion process imparts a unique microstructure to the age-hardenable AlSi10Mg alloy, known for its distinct properties. The fully cellular structure of eutectic Si governs both the work hardening behavior and the strengthening mechanisms, despite the occurrence of precipitation phenomenon. This study emphasizes the importance of using samples with a networked microstructure, rather than a composite-like microstructure, under loading conditions. AlSi10Mg samples were laser powder bed-fused onto a substrate preheated to 150 °C and then subjected to direct and artificial aging at 150 °C and 175 °C. The precipitation phenomena characterizing the AlSi10Mg samples with a networked microstructure did not significantly affect their uniform elongation values or work hardening capabilities. However, the best hardening performance was observed in samples where build platform preheating prevented precipitate formation. For enhanced deformation characteristics with lower energy consumption, AlSi10Mg samples should exhibit a composite-like microstructure in the solution heat-treated conditions (505 °C for 4 h). Precipitates formed at peak aging during artificial aging significantly reduced their work hardening ability, although some recovery was observed during over-aging.

Graphical abstract