Enhancing corrosion resistance through crystallographic texture control in additively manufactured superelastic NiTi alloy
Jia Ning Zhu (TU Delft - Team Vera Popovich)
Z. Li (TU Delft - Team Arjan Mol)
E. Rahimi (TU Delft - Team Arjan Mol)
Zhaorui Yan (TU Delft - Team Vera Popovich)
Zhaoying Ding (TU Delft - Team Marcel Hermans)
Arjan Mol (TU Delft - Team Arjan Mol)
Vera A. Popovich (TU Delft - Team Vera Popovich)
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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.
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