选区激光熔化制备TPMS晶格结构及力学性能  

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

作　　者：魏取龙 姜丽红[1] 刘征 朱琳 范炼海 王冠刚 赵明杰 郭正华[1] WEI Qulong;JIANG Lihong;LIU Zheng;ZHU Lin;FAN Lianhai;WANG Guangang;ZHAO Mingjie;GUO Zhenghua(School of Aeronautical Manufacturing and Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063

出　　处：《航空学报》2025年第3期296-311,共16页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(52305373,52465045)。

摘　　要：三周期极小曲面(TPMS)晶格结构具有的轻质、高强和能量吸收特性使其具有广泛的轻量化设计前景,然而传统方法难以制造。以Ti-6Al-4V粉末为材料,采用选区激光熔化(SLM)技术制备Gyroid和Primitive两种结构不同孔隙率的晶格点阵试样和实体拉伸试样,并进行力学性能和微观组织分析。结果表明:TPMS力学性能随孔隙率的增加而呈降低趋势,Primitive结构塑性优于Gyroid结构而整体强度低于Gyroid结构。TPMS晶格结构压缩屈服强度达到498 MPa,抗拉强度达到373.0 MPa,力学性能优于基于杆径类(体心立方、面心立方)的晶格结构,且点阵结构的延伸率比实体试样提高了2.8%~14.0%。两种点阵结构的断裂模式均为韧性和脆性混合,在点阵结构表面存在气孔和未熔合粉末,这种微观缺陷并不会影响其破坏机制。在相同工艺参数下制备的实体拉伸试样抗拉强度达到1050 MPa,延伸率达到17.5%,优于传统铸造的Ti-6Al-4V合金力学性能。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 us⁃ing 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 de⁃crease 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 mix⁃ture 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 1050 MPa and 17.5%,which is superior to the mechani⁃cal properties of traditional cast Ti-6Al-4V alloy.

关 键 词：TI-6AL-4V 选区激光熔化(SLM) 三周期极小曲面(TPMS) 力学性能 破坏机制 

分 类 号：V252[一般工业技术—材料科学与工程]