Compressive properties of Ti–6Al–4V auxetic mesh structures made by electron beam melting

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Mechanism of keyhole pore formation in metal additive manufacturing (2021, background): “Metal additive manufacturing (AM) is well known for its ability to fabricate complex-shaped parts without special tooling [1] and functionally graded parts [2], shorten the development cycle of products [3], and save the cost of the material [4].”
High specific strength and stiffness structures produced using selective laser melting (2014, background): “To date, the emphasis has been on structures produced from relatively simple unit cells, including BCC/octahedral [4, 5, 12, 15, 17], rhombic dodecahedron [13], tetrahedral [6] and auxetic [18] structures.”
Auxetic mechanical metamaterials: from soft to stiff (2023, methodology): “Similarly, Yang et al [208] used Ti-6Al4V materials to fabricate 3D re-entrant materials with NPR along three principal directions (see figure 7(d)).”
Auxetic mechanical metamaterials (2017, unknown): “73,81 Unlike most theoretical models, the above structures contain sti ﬀ cell walls and sti ﬀ joints that will initiate buckling at large deformations.”