TY - JOUR
T1 - Enhancing specific energy absorption of additively manufactured titanium lattice structures through simultaneous manipulation of architecture and constituent material
AU - Zhang, Jingqi
AU - Liu, Yingang
AU - Babamiri, Behzad Bahrami
AU - Zhou, Ying
AU - Dargusch, Matthew
AU - Hazeli, Kavan
AU - Zhang, Ming Xing
N1 - Funding Information:
J.Q. Zhang would like to thank the support of UQ Research Training Scholarships. The facilities and technical assistance of Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy and Microanalysis (CMM), The University of Queensland, are also acknowledged. M. Dargusch would like to acknowledge the support of the Australian Research Council through the ARC Research Hub for Advanced Manufacturing of Medical Devices (IH150100024). K. Hazeli would like to thank the Mechanics of Materials and Structures (MOMS) program at the National Science Foundation (NSF) under the Award Number: 1943465.
Funding Information:
J.Q. Zhang would like to thank the support of UQ Research Training Scholarships . The facilities and technical assistance of Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy and Microanalysis (CMM), The University of Queensland, are also acknowledged. M. Dargusch would like to acknowledge the support of the Australian Research Council through the ARC Research Hub for Advanced Manufacturing of Medical Devices ( IH150100024 ). K. Hazeli would like to thank the Mechanics of Materials and Structures (MOMS) program at the National Science Foundation (NSF) under the Award Number: 1943465 .
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/7
Y1 - 2022/7
N2 - Titanium lattice structures have found a wide range of lightweight applications. However, lattice structures made from the commonly-used commercially pure titanium (CP−Ti) and Ti−6Al−4V exhibit either low strength or post-yielding softening/collapse under uniaxial compression, making them less attractive to energy absorbing applications. In the present work, a series of titanium gyroid lattice structures have been designed and additively manufactured by laser powder bed fusion (L-PBF) to enhance the specific energy absorption (SEA) through manipulation of the architecture and the constituent material. Experimental results show that tailoring the sheet thickness gradient of gyroid lattice structures enables the transformation of the macroscopic deformation mode from hardening followed by softening, which is commonly seen in lattice structures, to continuous hardening. The addition of MgO nanoparticles to CP−Ti feedstock further improves the yield strength through oxygen solute strengthening, while maintaining the continuous hardening behaviour without any post-yielding softening or collapse. As a result, when both sheet thickness gradient and MgO are introduced, the SEA of the uniform gyroid lattice structure is enhanced by approximately 63% due to the combination of continuous hardening behaviour and high strength. Finite element analysis based on the modified volumetric hardening model has been performed to shed light on the underlying mechanism that governs the continuous hardening behaviour. This study demonstrates the tremendous potential of marrying architecture engineering with material design to create high performance lightweight lattice structures by L-PBF.
AB - Titanium lattice structures have found a wide range of lightweight applications. However, lattice structures made from the commonly-used commercially pure titanium (CP−Ti) and Ti−6Al−4V exhibit either low strength or post-yielding softening/collapse under uniaxial compression, making them less attractive to energy absorbing applications. In the present work, a series of titanium gyroid lattice structures have been designed and additively manufactured by laser powder bed fusion (L-PBF) to enhance the specific energy absorption (SEA) through manipulation of the architecture and the constituent material. Experimental results show that tailoring the sheet thickness gradient of gyroid lattice structures enables the transformation of the macroscopic deformation mode from hardening followed by softening, which is commonly seen in lattice structures, to continuous hardening. The addition of MgO nanoparticles to CP−Ti feedstock further improves the yield strength through oxygen solute strengthening, while maintaining the continuous hardening behaviour without any post-yielding softening or collapse. As a result, when both sheet thickness gradient and MgO are introduced, the SEA of the uniform gyroid lattice structure is enhanced by approximately 63% due to the combination of continuous hardening behaviour and high strength. Finite element analysis based on the modified volumetric hardening model has been performed to shed light on the underlying mechanism that governs the continuous hardening behaviour. This study demonstrates the tremendous potential of marrying architecture engineering with material design to create high performance lightweight lattice structures by L-PBF.
KW - Additive manufacturing
KW - Finite element analysis
KW - Laser powder bed fusion
KW - Lattice structures
KW - Specific energy absorption
KW - Titanium
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U2 - 10.1016/j.addma.2022.102887
DO - 10.1016/j.addma.2022.102887
M3 - Article
AN - SCOPUS:85130375447
SN - 2214-8604
VL - 55
JO - Additive Manufacturing
JF - Additive Manufacturing
M1 - 102887
ER -