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Materials Science in Additive Manufacturing NiTi lattice: Performance optimization

lower surface. The minimal surface of the I-WP lattice Investigation: Yun Chen, Bing Liu, and Xuan Cai
structure has a slight benefit in avoiding powder Methodology: Chunze Yan, Yusheng Shi, Lei Yang, and
adhesion on the side surface Mingkang Zhang
(ii) The minimum surface optimization design is still Writing – original draft: Yunlong Ren and Yang Li
applicable to the field of NiTi. The mechanical properties Writing – review & editing: Yunlong Ren and Lei Yang
can be improved when the minimum surface optimization
design is considered. The I-WP lattice structure has a Ethics approval and consent to participate
higher Young’s modulus and yield strength Not applicable.
(iii) Fatigue damage stands as the primary factor for the
fatigue failure of NiTi lattice structures prepared by Consent for publication
the LPBF process. The cracks of NiTi lattice structure Not applicable.
samples always occur at the root of metal powder
particles attached to the surface. The attached powder Availability of data
particles on the surface of NiTi lattice samples are
prepared to act as crack initiation points during fatigue Data are available from the corresponding author upon
failure and promote the generation of fatigue cracks, reasonable request.
which is not conducive to the fatigue performance of References
the NiTi sample.
(iv) The sample optimization design through the minimal 1. Bagheri A, Mahtabi MJ, Shamsaei N. Fatigue behavior and
surface can effectively improve the deformation cyclic deformation of additive manufactured NiTi. J Mater
resistance of NiTi lattice structure and change the Process Technol. 2018;252:440-453.
morphology of fracture surfaces in high cycle fatigue. doi: 10.1016/j.jmatprotec.2017.10.006
The fatigue strength improved from 1.88 MPa (BCC 2. Gu H, Bumke L, Chluba C, Quandt E, James RD. Phase
lattice structure) to 2.08 MPa (I-WP lattice structure). engineering and supercompatibility of shape memory alloys.
The enhancement in fatigue strength is attributed to Mater Today. 2018;21(3):265-277.
the predominant stress concentration of TPMS lattice
structures at the pillar with a more dispersed form doi: 10.1016/j.mattod.2017.10.002
and the stress concentration of strut-based lattice 3. Molod MA, Spyridis P, Barthold FJ. Applications of shape
structures at the nodes with an intensive form. memory alloys in structural engineering with a focus on
concrete construction - A comprehensive review. Constr
Acknowledgments Build Mater. 2022;337:127565.
The authors acknowledge the support provided by the doi: 10.1016/j.conbuildmat.2022.127565
State Key Laboratory of Materials Processing and Die and 4. Fang C, Liang D, Zheng Y, Yam MCH, Sun R. Rocking
Mould Technology. bridge piers equipped with shape memory alloy (SMA)
washer springs. Eng Struct. 2020;214:110651.
Funding
doi: 10.1016/j.engstruct.2020.110651
This study was supported by the National Natural Science 5. Xie W, Quinn J, Zhang J, Carson L, Chan CW. Control
Foundation of China (No. 52105396, 52235008, and of laser-gas-material interactions to enhance the surface
U2341270) and the Open Fund of Hubei Longzhong properties of NiTi for orthopaedic applications. Surf Coat
Laboratory (2022ZZ-28). Technol. 2021;421:127403.
Conflict of interest doi: 10.1016/j.surfcoat.2021.127403
The authors declare that they have no known competing 6. Yang X, Yang Q, Shi Y, et al. Effect of volume fraction and unit
financial interests or personal relationships that could have cell size on manufacturability and compressive behaviors of
Ni-Ti triply periodic minimal surface lattices. Addit Manuf.
appeared to influence the work reported in this paper. 2022;54:102737.
Author contributions doi: 10.1016/j.addma.2022.102737
Conceptualization: Yang Li and Lei Yang 7. Zhang C, Jin J, He M, Yang L. Compressive mechanics
Formal analysis: Yunlong Ren and Yang Li and hyperelasticity of Ni-Ti lattice structures fabricated by
Funding acquisition: Lei Yang, Yun Chen, Chunze Yan, and selective laser melting. Crystals. 2022;12(3):408.
Yusheng Shi doi: 10.3390/cryst12030408

Volume 3 Issue 2 (2024) 13 doi: 10.36922/msam.3380