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Twin-Wire Arc Additive Manufacturing and Solution Treatment for NiTiNb Alloy
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Orientador(es)
Resumo(s)
NiTiNb shape memory alloys (SMAs) are attractive for applications that demand a wide transformation hysteresis. In this study, NiTiNb thin walls were fabricated using twin-wire arc additive manufacturing (T-WAAM) via in-situ co-feeding of NiTi and Nb wires, and the effect of subsequent solution treatment on phase transformation, microstructure, phase constitution, and mechanical property was systematically investigated. Both the as-deposited (AD) and solution-treated (HT) NiTiNb exhibit a significantly wider transformation hysteresis compared with NiTi wire. Solution treatment sharpens the transformation peaks, shifts the transformation to higher temperatures, and preserves the wide hysteresis. The AD state is characterized by directional dendritic structures and a continuous Nb-rich inter-dendritic network with a pronounced build-aligned texture. After solution treatment, this network decomposes into discrete Nb-rich particles, accompanied by improved chemical homogeneity, and texture weakening, without noticeable grain coarsening. Phase analysis indicates slightly intensified TiNb and minor Ti2Ni formation, consistent with Nb partitioning from a supersaturated matrix. Mechanically, the AD state demonstrates slightly higher fracture strength but fails prematurely with reduced fracture strain, whereas the HT state shows modestly lower strength but enhanced ductility, consistent with fractographic observations. Overall, the combination of T-WAAM with an optimized solution treatment schedule effectively mitigates additive manufacturing-induced heterogeneity while maintaining the Nb-induced wide hysteresis, thereby providing a practical process rout for NiTiNb components with stable functional and mechanical performance.
Descrição
Publisher Copyright: © 2026 The Authors.
Palavras-chave
Microstructure NiTiNb Phase transformation Solution treatment Twin-wire arc additive manufacturing Software Algebra and Number Theory Computer Science Applications Strategy and Management Industrial and Manufacturing Engineering
Contexto Educativo
Citação
Editora
IOS Press BV