选区激光熔化制备TPMS晶格结构及力学性能

doi:10.7527/S1000-6893.2024.30593

Abstract

Abstract:

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.

Key words: Ti-6Al-4V, Selective Laser Melting (SLM), Triply Periodic Minimal Surface (TPMS), mechanical properties, failure mechanism

CLC Number:

V252

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 Aeronautica et Astronautica Sinica, 2025, 46(3): 430593.

Figures/Tables 29

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References 34

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扫描速度/（mm·s^-1）	致密度/%
扫描速度/（mm·s^-1）	激光功率为170 W	激光功率为190 W	激光功率为210 W
1 200	99.63	99.86	99.96
1 300	99.49	99.82	99.93
1 400	99.35	99.65	99.82
1 500	99.05	99.24	99.72

试样编号	长度/mm	宽度/mm	高度/mm
G-opt-37%	12.22	12.15	21.33
G-opt-50%	12.34	12.21	21.56
G-opt-63%	12.26	12.29	21.48
G-opt-70%	12.33	12.27	21.47
P-opt-54%	12.19	12.35	21.51
P-opt-60%	12.25	12.21	21.60
P-opt-71%	12.34	12.26	21.61

孔隙率/%	抗拉强度/MPa	弹性模量/MPa
70	122.5	1 673
63	163.0	2 233
50	257.0	2 032
37	373.0	2 656

孔隙率/%	抗拉强度/MPa	弹性模量/MPa
71	109.0	1 173
60	204.0	1 738
54	315.0	2 651
47	362.0	3 400

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Lattice structure and mechanical properties of TPMS prepared by selective laser melting

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