ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Lattice structure and mechanical properties of TPMS prepared by selective laser melting
Received date: 2024-04-23
Revised date: 2024-05-13
Accepted date: 2024-07-05
Online published: 2024-07-11
Supported by
National Natural Science Foundation of China(52305373)
Triply Period Minimal Surface （TPMS） lattice structures have a wide range of lightweight design prospects due to their lightweight， high strength and energy absorption properties. However， they are difficult to manufacture using traditional methods. Using Ti-6Al-4V powder as the material， lattice samples with different porosities of Gyroid and Primitive and solid tensile samples were fabricated by Selective Laser Melting （SLM） technique， and the mechanical properties and microstructure were analyzed. The results show that the mechanical properties of TPMS tend to decrease with the increase of porosity， and the plasticity of Primitive structure is better than that of Gyroid structure， but the overall strength is lower than that of Gyroid structure. The compressive yield strength and tensile strength of TPMS lattice structure reach 498 MPa and 373.0 MPa， and the mechanical properties of TPMS lattice structure are better than those based on bar diameter class （boby-centered cubic， face-centered cubic）， and the elongation of lattice structure is 2.8% to 14.0% higher than that of solid sample. The fracture modes of the both lattice structures area mixture of toughness and brittleness. Porosity and unfused powder are present on the surface of the lattice structures， but these microscopic defects do not affect their failure mechanism. The tensile strength and elongation of the solid tensile sample prepared under the same process parameters reach 1 050 MPa and 17.5%， which is superior to the mechanical properties of traditional cast Ti-6Al-4V alloy.
Qulong WEI , Lihong JIANG , Zheng LIU , Lin ZHU , Lianhai FAN , Guangang WANG , Mingjie ZHAO , Zhenghua GUO . Lattice structure and mechanical properties of TPMS prepared by selective laser melting[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(3) : 430593 -430593 . DOI: 10.7527/S1000-6893.2024.30593
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