Li Xiuhui, Ghasri-Khouzani Morteza, Bogno Abdoul-Aziz, Liu Jing, Henein Hani, Chen Zengtao, Qureshi Ahmed Jawad
Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Materials (Basel). 2021 Jun 30;14(13):3654. doi: 10.3390/ma14133654.
This study reports fabrication, mechanical characterization, and finite element modeling of a novel lattice structure based bimetallic composite comprising 316L stainless steel and a functional dissolvable aluminum alloy. A net-shaped 316L stainless steel lattice structure composed of diamond unit cells was fabricated by selective laser melting (SLM). The cavities in the lattice structure were then filled through vacuum-assisted melt infiltration to form the bimetallic composite. The bulk aluminum sample was also cast using the same casting parameters for comparison. The compressive and tensile behavior of 316L stainless steel lattice, bulk dissolvable aluminum, and 316L stainless steel/dissolvable aluminum bimetallic composite is studied. Comparison between experimental, finite element analysis (FEA), and digital image correlation (DIC) results are also investigated in this study. There is no notable difference in the tensile behavior of the lattice and bimetallic composite because of the weak bonding in the interface between the two constituents of the bimetallic composite, limiting load transfer from the 316L stainless steel lattice to the dissolvable aluminum matrix. However, the aluminum matrix is vital in the compressive behavior of the bimetallic composite. The dissolvable aluminum showed higher Young's modulus, yield stress, and ultimate stress than the lattice and composite in both tension and compression tests, but much less elongation. Moreover, FEA and DIC have been demonstrated to be effective and efficient methods to simulate, analyze, and verify the experimental results through juxtaposing curves on the plots and comparing strains of critical points by checking contour plots.
本研究报告了一种新型的基于晶格结构的双金属复合材料的制造、力学特性及有限元建模，该复合材料由316L不锈钢和一种功能性可溶解铝合金组成。通过选择性激光熔化（SLM）制造了由菱形单元胞组成的网状316L不锈钢晶格结构。然后通过真空辅助熔体浸渗填充晶格结构中的空洞，以形成双金属复合材料。还使用相同的铸造参数铸造了块状铝样品以作比较。研究了316L不锈钢晶格、块状可溶解铝以及316L不锈钢/可溶解铝双金属复合材料的压缩和拉伸行为。本研究还调查了实验结果、有限元分析（FEA）和数字图像相关（DIC）结果之间的比较。由于双金属复合材料两种成分之间界面的弱结合，限制了从316L不锈钢晶格到可溶解铝基体的载荷传递，因此晶格和双金属复合材料的拉伸行为没有显著差异。然而，铝基体在双金属复合材料的压缩行为中至关重要。在拉伸和压缩试验中，可溶解铝的杨氏模量、屈服应力和极限应力均高于晶格和复合材料，但伸长率要小得多。此外，通过在图上并列曲线并通过检查等高线图比较临界点的应变，已证明有限元分析和数字图像相关是模拟、分析和验证实验结果的有效方法。
