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Microstructure, Macrosegregation, and Mechanical Properties of NiTi to Ti6Al4V Dissimilar Laser Welds Using Co Interlayer

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Abstract

Joining alloys exhibiting individual superior properties could yield major benefits in terms of design and production flexibility. Nevertheless, differences in thermophysical properties between the materials to be joined complicate the formation of dissimilar combinations, thus limiting the potential applications of multiple engineering alloys. The formation of brittle Ti2Ni intermetallic (IMC) in the fusion zone (FZ) is the main challenge in joining NiTi to Ti6Al4V without an interlayer. Hence, the composition of the FZ needs to be changed to ideally suppress brittle IMC phases to form and decrease the likelihood of crack formation upon solidification. In this study, two strategies were used concurrently to reduce brittle Ti2Ni intermetallic compound: a cobalt interlayer was introduced in a butt joint configuration, and the laser was offset to the Ti6Al4V side. The use of a Co interlayer resulted in a joint free of brittle interaction layer susceptible to microcracks at the NiTi boundary by reducing the amount of brittle Ti2Ni intermetallic compound. A joint with a lower hardness of 438HV was attained, compared to 515HV for the conventional NiTi/Ti6Al4V joint. The maximum strength and fracture strain of the Co-interlayered joint were improved to 285MPa and 1.67%, respectively, compared to 148MPa and 0.8% for the Co-free joint.

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Copyright 1999, with permission from Elsevier. (b) Ti-Ni-Co (Ref 9). Reprinted with permission of ASM International. All rights reserved. www.asminternational.org

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Acknowledgments

This work was supported by, Natural Science Foundation of China (No. 51775091), Science and Technology Project of Sichuan Province (No. 2020ZDZX0015), Guangdong Basic and Applied Basic Research Foundation (No.2021B1515140048). JPO acknowledges Fundação para a Ciência e Tecnologia (FCT) for its financial support through the project UIDB/00667/2020 (UNIDEMI). JPO acknowledges the funding of CENIMAT/i3N by national funds through the FCT-Fundação para a Ciência e a Tecnologia, I.P., within the scope of Multiannual Financing of R&D Units, reference UIDB/50025/2020-2023.

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Sichuan, 611731, China

    Fissha Biruke Teshome, Bei Peng, Wenchao Ke, Fuguo Ge & Zhi Zeng

  2. UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal

    J. P. Oliveira

  3. CENIMAT/I3N, Department of Materials Science, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal

    J. P. Oliveira

  4. School of Material Science and Engineering, Tianjin University, Tianjin, 300072, China

    Sansan Ao

  5. Institute of Electronic and Information Engineering of UESTC in Guangdong, Chengdu, 523808, China

    Zhi Zeng

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  1. Fissha Biruke Teshome
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  2. Bei Peng
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FBT: Conceptualization, Writing - original draft, Methodology, and Data curation. BP: Supervision, Writing - review & editing, and Resources. JPO: Data curation, Writing - review & editing, Validation, and Resources. SA: Writing - review & editing, Validation, and Resources. WK: Data curation, Software and Writing - review & editing. FG: Software and Writing - review & editing. ZZ: Conceptualization, Supervision, Writing - review & editing, Validation and Resources. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Zhi Zeng.

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Teshome, F.B., Peng, B., Oliveira, J.P. et al. Microstructure, Macrosegregation, and Mechanical Properties of NiTi to Ti6Al4V Dissimilar Laser Welds Using Co Interlayer. J. of Materi Eng and Perform 31, 9777–9790 (2022). https://doi.org/10.1007/s11665-022-07064-0

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