AccScience Publishing / MSAM / Volume 3 / Issue 2 / DOI: 10.36922/msam.3137

Effects of aging heat treatment on the mechanical properties of NiTi triply periodic minimal surface

Jinwei Li1 Mingkang Zhang1* Jie Chen2 Chang Liu1 Wenbin Liu1 Mingjian Deng1
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1 Additive Manufacturing Laboratory, School of Mechanical and Energy Engineering, Guangdong Ocean University, Yangjiang, Guangdong, China
2 Institute of Intelligent Manufacturing, Guangdong Academy of Sciences, Guangzhou, Guangdong, China
Submitted: 11 March 2024 | Accepted: 22 April 2024 | Published: 24 May 2024
© 2024 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( )

This study investigated the impact of aging heat treatment time on the mechanical properties of NiTi triply periodic minimal surface structures fabricated through laser powder bed fusion. X-ray diffraction analysis results indicate that with increasing aging time, the NiTi2 phase precipitates while the content of the B19’ phase decreases. At 10 h of aging time, the Ni4Ti3 phase becomes evident in the sample. The differential scanning calorimeter results show that R phase transformation occurs, and the phase transformation temperature increases when the aging time reaches 6 h. Microhardness increases with aging time, peaking at 477.8 HV after 10 h. Compression experiment results reveal a maximum elastic modulus of 1262.82 MPa for the gyroid sheet-shaped structure achieved after 2 h. In addition, the superelasticity test indicates the highest recoverable strains at 2%, 4%, and 6% compressive strain for the gyroid rod-shaped structure after aging for 10 h. In cyclic compression experiments, the ratio of shape memory recovery increases from 40% at 0 h to 97% at 6 h. Fracture analysis results show that the transition in the fracture mechanism from brittle fracture to quasi-cleavage fracture occurs after aging heat treatment.

NiTi alloy
Laser powder bed fusion
Aging heat treatment
Triply periodic minimal surface
Shape memory effect
This research was funded by the Guangdong Natural Science Foundation (No. 2023A1515012704), Guangdong Basic and Applied Basic Research Foundation-Youth Fund Project (No. 2021A1515110033), Program for scientific research start-up funds of Guangdong Ocean University (360302022201), and GDA’s Project of Science and Technology Development (2022GDASZH-2022010107).
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Conflict of interest
The authors declare that they have no competing interests.
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Materials Science in Additive Manufacturing, Electronic ISSN: 2810-9635 Published by AccScience Publishing