High ductility induced by twin-assisted grain rotation and merging in solid-state cold spray additive manufactured Cu

doi:10.1016/j.jmst.2024.06.032

J. Mater. Sci. Technol. ›› 2025, Vol. 214: 11-15.DOI: 10.1016/j.jmst.2024.06.032

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High ductility induced by twin-assisted grain rotation and merging in solid-state cold spray additive manufactured Cu

Wenya Li^a,b,*, Jingwen Yang^a,b, Zhengmao Zhang^a,b, Yingchun Xie^c, Chunjie Huang^a,b,*

^aState Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China;
^bShaanxi Key Laboratory of Friction Welding Technologies, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China;
^cInstitute of New Materials, Guangdong Academy of Sciences, National Engineering Laboratory of Modern Materials Surface Engineering Technology, Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, Guangzhou 510651, PR China

Received:2024-05-06 Revised:2024-06-21 Accepted:2024-06-24 Published:2025-04-10 Online:2025-04-05
Contact: *E-mail addresses: liwy@nwpu.edu.cn (W. Li), huangc@nwpu.edu.cn (C. Huang)

Abstract

Abstract: In contrast to fusion-based additive manufacturing (AM) methods, cold spray (CS) is a solid-state metal powder deposition process that has evolved from a traditional coating method to a novel AM technique, i.e. CSAM, for fabricating components and repairing damaged parts. In this study, we demonstrate that the long-standing low ductility of CSAM metallic deposits can be addressed through constructing a unique microstructure. A Cu deposit with 29.7% in elongation and 270 MPa in tensile strength has been produced using a proper spray parameter set. The high ductility of the Cu deposit originates from grain rotation and merging during tensile deformation, which is facilitated by twin boundaries acting as a bridge to dislocations slip. The understanding of high-ductility Cu deposits may help develop other high-strength and high-ductility CSAM metallic materials.

Key words: Cold spray additive manufacturing, Copper, High ductility, Twin, Grain growth

Wenya Li, Jingwen Yang, Zhengmao Zhang, Yingchun Xie, Chunjie Huang. High ductility induced by twin-assisted grain rotation and merging in solid-state cold spray additive manufactured Cu[J]. J. Mater. Sci. Technol., 2025, 214: 11-15.

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High ductility induced by twin-assisted grain rotation and merging in solid-state cold spray additive manufactured Cu

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