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<p>Annealing treatment can modulate the microstructure of AlSi10Mg alloy fabricated by laser powder bed fusion (LPBF), optimize its mechanical properties, and thereby promote the industrial application of LPBF aluminum alloys. Consequently, this paper investigates the microstructure evolution and its impact on the mechanical properties of LPBF-fabricated AlSi10Mg alloy following annealing heat treatment. Microstructure characterization was performed using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD), while phase identification was conducted via X-ray diffraction (XRD). Mechanical properties were characterized through tensile tests and hardness measurements. The results indicate that in the as-deposited specimen, the overlapping molten pool stacking structure induced by the laser scanning path is clearly observable, and the microstructure consists of reticular eutectic Si and an <i>α</i>-Al matrix. After annealing at relatively low temperatures, the grain morphology and size showed no significant changes. However, when the annealing temperature reached or exceeded 275&#xa0;&#xa0;C, the melt pool morphology gradually disappeared, the network structure fragmented, and Si phases precipitated from the Al matrix, subsequently spheroidizing and coarsening. The as-deposited specimen exhibited the highest strength and hardness, with a yield strength of 476.36&#xa0;MPa, an ultimate tensile strength of 295.46 MPa, a hardness of 134 ± 4.7&#xa0;HV on the YZ plane, and 110.75 ± 5.55&#xa0;HV on the XY plane. With increasing annealing temperature, the strength and hardness of the specimens generally decreased, while the elongation exhibited an overall increasing trend. The annealing treatment induced continuous transformation of the Si phase morphology, which in turn affected the specimen strength. As the heat treatment temperature increased, the Si network was disrupted, forming discrete Si particles that further spheroidized and grew, leading to a continual decrease in alloy strength. Conversely, the elongation increased, reaching a maximum of 16.09%.</p>

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Research on multiscale microstructure evolution and mechanical properties of annealed LPBF-fabricated AlSi10Mg alloy

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Daijun Lu,
  • Mengzhong Gi,
  • Lei Wu,
  • Wei Ma,
  • Yujie Lu,
  • Wenwen Lin,
  • Tingxiao Tang,
  • Ying Wang,
  • Anmin Yin

摘要

Annealing treatment can modulate the microstructure of AlSi10Mg alloy fabricated by laser powder bed fusion (LPBF), optimize its mechanical properties, and thereby promote the industrial application of LPBF aluminum alloys. Consequently, this paper investigates the microstructure evolution and its impact on the mechanical properties of LPBF-fabricated AlSi10Mg alloy following annealing heat treatment. Microstructure characterization was performed using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD), while phase identification was conducted via X-ray diffraction (XRD). Mechanical properties were characterized through tensile tests and hardness measurements. The results indicate that in the as-deposited specimen, the overlapping molten pool stacking structure induced by the laser scanning path is clearly observable, and the microstructure consists of reticular eutectic Si and an α-Al matrix. After annealing at relatively low temperatures, the grain morphology and size showed no significant changes. However, when the annealing temperature reached or exceeded 275  C, the melt pool morphology gradually disappeared, the network structure fragmented, and Si phases precipitated from the Al matrix, subsequently spheroidizing and coarsening. The as-deposited specimen exhibited the highest strength and hardness, with a yield strength of 476.36 MPa, an ultimate tensile strength of 295.46 MPa, a hardness of 134 ± 4.7 HV on the YZ plane, and 110.75 ± 5.55 HV on the XY plane. With increasing annealing temperature, the strength and hardness of the specimens generally decreased, while the elongation exhibited an overall increasing trend. The annealing treatment induced continuous transformation of the Si phase morphology, which in turn affected the specimen strength. As the heat treatment temperature increased, the Si network was disrupted, forming discrete Si particles that further spheroidized and grew, leading to a continual decrease in alloy strength. Conversely, the elongation increased, reaching a maximum of 16.09%.