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<p>In order to investigate the effect of geometric parameters (unit cell topology, pillar size) on the porosity, mechanical properties and microstructure of lattice structure, Selective laser melting was employed to fabricate Ti6Al4V lattice structures, including uniform lattice structures with three different cell topology types and gradient lattice structures with three different pillar sizes. The porosity, microstructure, and compressive mechanical properties of these structures were characterized. The results demonstrate that the cell topology has a minimal impact on the porosity of the lattice structure. In contrast, for gradient lattice structures, as the size of the pillars increases, the reduction in porosity initially increases and then decreases. The microstructure of lattice structure with different topological structures and different pillar sizes is not much different, indicating that different cell types have little effect on the metallographic structure of lattice structure. Concurrently, when the porosity of both is the identical, the mechanical properties of the gradient lattice structure are superior to those of the uniform lattice structure. The maximum compressive strength and yield strength in the gradient lattice structure are higher by 8.32&#xa0;MPa and 7.31&#xa0;MPa, respectively, compared to those of the uniform lattice structure with a body-centered cubic arrangement.</p>

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Effect of Geometric Parameters on the Mechanical Properties of Lattice Structures of Selective Laser Melting Titanium Alloys

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Gaoshen Cai,
  • Yuheng Hu,
  • Haozhe Jin,
  • Kai Peng,
  • Yongfeng Yuan,
  • Bingxu Wang,
  • Chunlei Liang,
  • Xiantao Chen,
  • Shuangquan Li

摘要

In order to investigate the effect of geometric parameters (unit cell topology, pillar size) on the porosity, mechanical properties and microstructure of lattice structure, Selective laser melting was employed to fabricate Ti6Al4V lattice structures, including uniform lattice structures with three different cell topology types and gradient lattice structures with three different pillar sizes. The porosity, microstructure, and compressive mechanical properties of these structures were characterized. The results demonstrate that the cell topology has a minimal impact on the porosity of the lattice structure. In contrast, for gradient lattice structures, as the size of the pillars increases, the reduction in porosity initially increases and then decreases. The microstructure of lattice structure with different topological structures and different pillar sizes is not much different, indicating that different cell types have little effect on the metallographic structure of lattice structure. Concurrently, when the porosity of both is the identical, the mechanical properties of the gradient lattice structure are superior to those of the uniform lattice structure. The maximum compressive strength and yield strength in the gradient lattice structure are higher by 8.32 MPa and 7.31 MPa, respectively, compared to those of the uniform lattice structure with a body-centered cubic arrangement.