Healing cracks in additively manufactured NiTi shape memory alloys

Journal article (2023)

Authors

Jia-Ning Zhu Team Vera Popovich - Mechanical, Maritime and Materials Engineering
Z. Ding Team Marcel Hermans - Mechanical, Maritime and Materials Engineering
Evgenii Borisov Peter the Great Saint-Petersburg Polytechnic University
Xiyu Yao Southern University of Science and Technology
J.C. Brouwer Team Marcel Hermans - Mechanical, Maritime and Materials Engineering
Anatoly Popovich Peter the Great Saint-Petersburg Polytechnic University
M.J.M. Hermans Team Marcel Hermans - Mechanical, Maritime and Materials Engineering
V. Popovich Team Vera Popovich - Mechanical, Maritime and Materials Engineering
Research Group
Team Vera Popovich (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2023 Jia-Ning Zhu, Z. Ding, Evgenii Borisov, Xiyu Yao, J.C. Brouwer, Anatoly Popovich, M.J.M. Hermans, V. Popovich
DOI
help_outline
https://doi.org/10.1080/17452759.2023.2246437
Superelasticity Spark plasma sintering Laser powder bed fusion Healing crack NiTi alloys
More Info
expand_more

Published Date

2023

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Materials Science and Engineering

Research Group

Team Vera Popovich

Abstract

The pursuit of enhancing NiTi superelasticity through laser powder bed fusion (L-PBF) and [001] texture creation poses a challenge due to increased susceptibility to hot cracking in the resulting microstructure with columnar grains. This limitation restricts NiTi's application and contributes to material waste. To overcome this, we introduce a pioneering approach: utilising spark plasma sintering (SPS) to heal directional cracks in [001] textured L-PBF NiTi shape memory alloy. Diffusion bonding and oxygen utilisation for Ti2NiOx formation was found to successfully heal the cracks. SPS enhances mechanical properties, superelasticity at higher temperatures, and two-way shape memory strain during thermomechanical cycling. This work provides an alternative solution for healing cracks in L-PBF parts, enabling the sustainable reuse of cracked materials. By implementing SPS, this approach effectively addresses hot cracking limitations, expanding the application potential of L-PBF NiTi parts while improving their functional and mechanical properties.