J. Mater. Sci. Technol. ›› 2023, Vol. 134: 234-243.DOI: 10.1016/j.jmst.2022.07.003

• Research Article • Previous Articles     Next Articles

Ductile and high strength Cu fabricated by solid-state cold spray additive manufacturing

Chaoyue Chena,1, Yingchun Xieb,1,*(), Shuo Yinc,*(), Wenya Lid,*(), Xiaotao Luoe, Xinliang Xief, Ruixin Zhaoa, Chunming Dengb, Jiang Wanga,*(), Hanlin Liaog, Min Liub, Zhongming Rena   

  1. aState Key Laboratory of Advanced Special Steels, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
    bInstitute 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, China
    cTrinity College Dublin, The University of Dublin, Department of Mechanical and Manufacturing Engineering, Parsons Building, Dublin 2, Ireland
    dState Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
    eState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    fKey laboratory for Light-weight Materials, Nanjing Techchnology University, Nanjing 211816, China
    gICB UMR 6303, CNRS, Univ. Bourgogne Franche-Comté, UTBM, F-90010 Belfort, France
  • Received:2022-06-22 Revised:2022-07-08 Accepted:2022-07-10 Published:2023-01-20 Online:2023-01-10
  • Contact: Yingchun Xie,Shuo Yin,Wenya Li,Jiang Wang
  • About author:jiangwang@i.shu.edu.cn (J. Wang).
    liwy@nwpu.edu.cn (W. Li),
    yins@tcd.ie (S. Yin),
    * E-mail addresses: yingchun0824@163.com (Y. Xie),
    First author contact:1These authors contributed equally to this work.

Abstract:

In this work, pure Cu with excellent strength and ductility (UTS of 271 MPa, elongation to fracture of 43.5%, uniform elongation of 30%) was prepared using cold spray additive manufacturing (CSAM), realizing a breakthrough in the field. An in-depth investigation was conducted to reveal the microstructure evolution, strengthening and ductilization mechanisms of the CSAM Cu, as well as the single splats. The results show that the CSAM Cu possesses a unique heterogeneous microstructure with a bimodal grain structure and extensive infinitely circulating ring-mounted distribution of twinning. Based on the single splat observation, the entire copper particle forms a gradient nano-grained (GNG) structure after high-speed impact deposition. The GNG-structured single splat serves as a unit to build the heterogeneous microstructure with bimodal grain distribution during the successive deposition in CSAM. The results also show that CSAM can achieve synergistic strengthening and ductilization by controlling the grain refinement and dislocation density. This work provides potential for CSAM technique in manufacturing various metallic parts with the desired combination of high strength and good ductility without additional post-treatments.

Key words: Cold spray additive manufacturing, Copper, Heterogeneous microstructure, Strength, Ductility