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<p>Lightweight aluminum alloys fabricated by selective laser melting (SLM) have gained great attention in the industrial field. In this work, the influence of process parameters on the defects, microstructure, and mechanical properties of SLM-fabricated AlSi7Mg alloys was investigated by optical microscopy, scanning electron microscopy, and tensile tests. It was found that the SLM-fabricated AlSi7Mg alloys exhibited excellent printability with a relative density higher than 95.85%. The statistics data indicated that the average diameter of the pores was 86.94&#xa0;μm and 43.02&#xa0;μm for GP-1 and GP-2 alloys, respectively, and the average diameter of the unmelted powders was 84.91 and 26.83&#xa0;μm for UMP-1 and UMP-2 alloys, respectively. The alloys containing different sizes of pores have excellent ductility and good fracture strength, but relative low yield strength. Results show that the size of unmelted powders plays a key role in determining the strength and ductility of the alloys. Large unmelted powders decreased the fracture strength and ductility, while fine unmelted powders did not obviously alter their strength and ductility. Fracture analysis indicated that the fracture mechanism of the SLM-fabricated AlSi7Mg alloys belongs to a mixed ductile and brittle fracture, and the cracks nucleate and propagate along the melt pool boundaries.</p>

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Microstructure, Solidification Defects, and Mechanical Properties of AlSi7Mg Alloys Fabricated by Selective Laser Melting

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Yu Zhao,
  • Zhilai Chen,
  • Chunling Zhao,
  • Yao Shi,
  • Yunqiu Zhang,
  • Ying Wang,
  • Dengbiao Wang

摘要

Lightweight aluminum alloys fabricated by selective laser melting (SLM) have gained great attention in the industrial field. In this work, the influence of process parameters on the defects, microstructure, and mechanical properties of SLM-fabricated AlSi7Mg alloys was investigated by optical microscopy, scanning electron microscopy, and tensile tests. It was found that the SLM-fabricated AlSi7Mg alloys exhibited excellent printability with a relative density higher than 95.85%. The statistics data indicated that the average diameter of the pores was 86.94 μm and 43.02 μm for GP-1 and GP-2 alloys, respectively, and the average diameter of the unmelted powders was 84.91 and 26.83 μm for UMP-1 and UMP-2 alloys, respectively. The alloys containing different sizes of pores have excellent ductility and good fracture strength, but relative low yield strength. Results show that the size of unmelted powders plays a key role in determining the strength and ductility of the alloys. Large unmelted powders decreased the fracture strength and ductility, while fine unmelted powders did not obviously alter their strength and ductility. Fracture analysis indicated that the fracture mechanism of the SLM-fabricated AlSi7Mg alloys belongs to a mixed ductile and brittle fracture, and the cracks nucleate and propagate along the melt pool boundaries.