Print Email Facebook Twitter Healing cracks in additively manufactured NiTi shape memory alloys Title Healing cracks in additively manufactured NiTi shape memory alloys Author Zhu, Jia-Ning (TU Delft Team Vera Popovich) Ding, Z. (TU Delft Team Marcel Hermans) Borisov, Evgenii (Peter the Great Saint-Petersburg Polytechnic University) Yao, Xiyu (Southern University of Science and Technology) Brouwer, J.C. (TU Delft Team Marcel Hermans) Popovich, Anatoly (Peter the Great Saint-Petersburg Polytechnic University) Hermans, M.J.M. (TU Delft Team Marcel Hermans) Popovich, V. (TU Delft Team Vera Popovich) Date 2023 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. Subject healing crackLaser powder bed fusionNiTi alloysspark plasma sinteringsuperelasticity To reference this document use: http://resolver.tudelft.nl/uuid:d15724ca-3922-4b30-8c05-6e4a9ffa78ef DOI https://doi.org/10.1080/17452759.2023.2246437 ISSN 1745-2759 Source Virtual and Physical Prototyping, 18 (1) Part of collection Institutional Repository Document type journal article Rights © 2023 Jia-Ning Zhu, Z. Ding, Evgenii Borisov, Xiyu Yao, J.C. Brouwer, Anatoly Popovich, M.J.M. Hermans, V. Popovich Files PDF Healing_cracks_in_additiv ... alloys.pdf 5.46 MB Close viewer /islandora/object/uuid:d15724ca-3922-4b30-8c05-6e4a9ffa78ef/datastream/OBJ/view