Enhancing corrosion resistance through crystallographic texture control in additively manufactured superelastic NiTi alloy
Jia Ning Zhu (TU Delft - Mechanical Engineering)
Ziyu Li (TU Delft - Mechanical Engineering)
Ehsan Rahimi (TU Delft - Mechanical Engineering)
Zhaorui Yan (TU Delft - Mechanical Engineering)
Zhaoying Ding (TU Delft - Mechanical Engineering)
Arjan Mol (TU Delft - Mechanical Engineering)
Vera Popovich (TU Delft - Mechanical Engineering)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
NiTi alloys, widely used for their shape memory and superelastic properties, face corrosion challenges when fabricated via laser powder bed fusion (LPBF). This study investigates the dual-phase formation in LPBF NiTi and its impact on corrosion resistance. Thermal simulations and microstructural analysis reveal that thermal stress drives martensite formation near melt pool boundaries. Martensitic regions act as anodic sites, leading to localized corrosion. Optimizing LPBF parameters produced single-phase [001]-textured NiTi, eliminating martensite and significantly reducing the corrosion current by almost two orders of magnitude and enhancing superelastic performance simultaneously. These findings highlight texture control as a key strategy to improve corrosion resistance and functionality for advanced applications.
help_outline