Mechanical response of TiAl6V4 lattice structures manufactured by selective laser melting in quasistatic and dynamic compression tests

Abstract

This paper focusses on the investigation of the mechanical properties of lattice structures manufactured by selective laser melting using contour-hatch scan strategy. The motivation for this research is the systematic investigation of the elastic and plastic deformation of TiAl6V4 at different strain rates. To investigate the influence of the strain rate on the mechanical response (e.g., energy absorption) of TiAl6V4 structures, compression tests on TiAl6V4-lattice structures with different strain rates are carried out to determine the mechanical response from the resulting stress-strain curves. Results are compared to the mechanical response of stainless steel lattice structures (316L). It is shown that heat-treated TiAl6V4 specimens have a larger breaking strain and a lower drop of stress after failure initiation. Main finding is that TiAl6V4 lattice structures show brittle behavior and low energy absorption capabilities compared to the ductile behaving 316L lattice structures. For larger strain rates, ultimate tensile strength of TiAl6V4 structures is more than 20% higher compared to lower strain rates due to cold work hardening

High‐Entropy Alloy (HEA)‐Coated Nanolattice Structures and Their Mechanical Properties

“…[18,19] BCC topological structure is introduced, since its extensively experimentally and theoretically examined. [37] More importantly, the CoCrFeNiAl 0.3 HEA thin film coating fabricated via radio frequency (RF) sputtering methodology has been developed and applied in nanolattice structures for the first time. Combining the merits of HEA and polymer nanolattice structures, the presented hybrid nanolattices exhibit superior compressive specific strength of 0.032 MPa kg À1 m 3 with density below 1000 kg m À3 , while still own an admirable compressive ability as compared to those made by pure metal/alloys.…”

Crushing behavior of a thin-walled circular tube with internal gradient grooves fabricated by SLM 3D printing

“…As this SLM printed tube can experience the two modes during the crushing process, both the advantages of the two modes can be taken in one structure. The tube is completely compacted in Image (14), the final crush morphology of the experimental and numerical results are shown in Images (15) and (16) in Fig. 10.…”

“…When the SLM printed structure bears axial loading, the brittle character of the material tends to induce fracture of the structure. For example, the SLM printed TiAl6V4 lattice structure fractures when the macroscopic strain reaches 20% due to the low ductility (~10%) of the material [14]. For the buckling mode of the SLM printed thinwalled tube, the plastic hinges may not bend into a complete fold before it fractures because of the material brittleness.…”

“…Further, in large deformation area, many authors studied the crushing behavior of SLM printed lattice structures with different cell types and sizes [10][11][12][13][14]. Mckown et al [10] performed quasi-static compression tests and blast tests for the metallic lattice structures with different cells, failure buckling modes of different structures and strain rate sensitivity were observed.…”

Additive manufactured push‐fit implant fixation with screw‐strength pull out

“…21 For implant fixation, a big draw of AM technology is the ability to create porous structures that bone can grow into, allowing improvement in long-term fixation; consequently porous structures have been extensively researched. [22][23][24][25][26][27][28][29][30][31][32] Recent research has also suggested that AM fixation features could improve the initial stability of implants. 14,15 This area has been much less researched but is of equal importance as initial implant stability is a prerequisite for long-term fixation.…”