SLM成形Ti-6Al-4V层状混合点阵结构的力学性能和吸能特性研究  

Mechanical Properties and Energy Absorption Characteristics of SLM-Formed Ti-6Al-4V Layered Hybrid Lattice Structure

作　　者：任毅 冉威 蒲林 蔡锶杨 赵宇成 REN Yi;RAN Wei;PU Lin;CAI Siyang;ZHAO Yucheng(School of Aeronautics,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Key Laboratory of Green Aviation Energy and Power,Chongqing 401130,China)

机构地区：[1]重庆交通大学航空学院,重庆400074 [2]绿色航空能源动力重庆市重点实验室,重庆401130

出　　处：《重庆交通大学学报（自然科学版）》2024年第6期118-126,共9页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(52001038);重庆市自然科学基金项目(cstc2019jcyj-msxmX0787);重庆市教育委员会科学技术研究项目(KJQN201900712);重庆交通大学研究生科研创新项目(2023S0125)。

摘　　要：以选区激光熔化(SLM)成形的Ti-6Al-4V钛合金层状混合点阵结构为研究对象。首先设计并制备了由体心立方(BCC)单胞构成的单一点阵结构以及由BCC单胞和面心立方(FCC)单胞组成的2种层状混合点阵结构;其次,利用扫描电子显微镜(SEM)对所制备的点阵结构表面形貌和几何结构进行了表征;再次,采用万能力学试验机对点阵结构进行了准静态单轴压缩试验,并比较了不同点阵结构的力学性能和吸能性能;最后,分析并讨论了单一点阵结构和层状混合点阵结构的变形模式。结果表明:与BCC单一点阵结构相比,层状混合点阵结构TBF-A和TBF-B的弹性模量分别提高27.80%和24.15%,屈服强度分别提高22.96%和18.36%,比吸能分别提高96.01%和33.33%;在变形行为方面,BCC点阵结构沿45°方向整体断裂,而TBF-A和TBF-B层状混合点阵由于增强相(FCC点阵结构)的存在,其断裂仅发生在基体相(BCC点阵结构)区域。The Ti-6Al-4V titanium alloy lattice structure formed by selective laser melting(SLM)was used as the object of study.Firstly,a single lattice structure composed of body-centered cubic(BCC)unit cell and the layered-hybrid lattice structure composed of BCC unit cell and face-centered cubic(FCC)unit cell were designed and prepared.Secondly,the surface morphology and geometry structure of the prepared lattice structures were characterized by using scanning electron microscopy(SEM).Thirdly,quasi-static uniaxial compression tests on the lattice structure were performed by using a universal mechanical testing machine,and the mechanical and energy absorption properties of different lattice structures were compared.Finally,the deformation modes of the single lattice structure and the layered hybrid lattice structure were analyzed and discussed.The results show that the elastic modulus of the layered hybrid lattice structures TBF-A and TBF-B is respectively increased by 27.80%and 24.15%,the yield strength is respectively increased by 22.96%and 18.36%,and the specific energy absorption is respectively increased by 96.01%and 33.33%,compared with the single BCC lattice structure.In addition,in terms of deformation behavior,the BCC lattice structure undergoes overall fracture along the 45°direction,and the fracture of the TBF-A and TBF-B layered hybrid lattice structures occurs only in the region of the matrix phase(BCC lattice structure)due to the presence of the reinforce phase(FCC lattice structure).

关 键 词：航空工程 点阵结构 力学性能 吸能性能 选区激光熔化 

分 类 号：U8[交通运输工程] V252[一般工业技术—材料科学与工程] TG456.7[航空宇航科学与技术—航空宇航制造工程]