Mechanical properties of additively manufactured variable lattice structures of Ti6Al4V

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:809

Article

Traxel, Kellen D.¹  Groden, Cory¹  Valladares, Jesus¹  Bandyopadhyay, Amit¹  Keck, W. M.¹ 

[1] Washington State Univ, Sch Mech & Mat Engn, WM Keck Biomed Mat Res Lab, Pullman, WA 99164 USA

关键词: Powder bed fusion;    Mechanical properties;    Lattice structures;    Ti6Al4V;    Selective laser melting;   

DOI  :  10.1016/j.msea.2021.140925

来源: Elsevier

【 摘 要 】

Engineered micro-and macro-structures via additive manufacturing (AM) or 3D-Printing can create structurally varying properties in parts that are difficult to achieve via traditional manufacturing methods. Herein we have utilized powder bed fusion-based selective laser melting (SLM) to fabricate variable lattice structures of Ti6Al4V with uniquely designed unit cell configurations to alter the compressive performance. Five different configurations were designed based on two natural crystal structures ? hexagonal closed packed (HCP) and body-centered cubic (BCC). Under compressive loading, as much as 74% difference was observed in compressive strength and 71% variation in elastic modulus, with all samples having porosities in a similar range of 53?65%, indicating the influence of macro-lattice designs alone on mechanical properties. Finite element analysis (FEA) and failure analysis of the fracture surfaces aided our understanding of how configurational effects and unit cell design influence these samples? mechanical properties. Our work highlights the ability to leverage advanced manufacturing techniques to tailor the structural performance of multifunctional components.

【 授权许可】

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