J. Mater. Sci. Technol. ›› 2025, Vol. 221: 155-167.DOI: 10.1016/j.jmst.2024.09.039

• Research Article • Previous Articles     Next Articles

Improving mechanical and electrical properties of Cu-Ni-Si alloy via machine learning assisted optimization of two-stage aging processing

Jinyu Lianga,b, Fan Zhaoa,c*, Guoliang Xied, Rui Wanga,b, Xiao Liua,b, Wenli Xuea,b, Xinhua Liua,e,f,*   

  1. aKey Laboratory for Advanced Materials Processing (MOE), Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;
    bBeijing Laboratory of Metallic Materials and Processing for Modern Transportation, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;
    cInstitute of Materials Intelligent Technology, Liaoning Academy of Materials, Shenyang 110167, China;
    dState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;
    eBeijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    fInstitute of Materials Genome Engineering, Henan Academy of Sciences, Zhengzhou 450046, China
  • Received:2024-07-18 Revised:2024-09-02 Accepted:2024-09-19 Published:2024-10-18 Online:2024-10-18
  • Contact: *E-mail addresses: zhaofan@ustb.edu.cn (F. Zhao), liuxinhua18@163.com (X. Liu)

Abstract: Recent studies have shown that synergistic precipitation of continuous precipitates (CPs) and discontinuous precipitates (DPs) is a promising method to simultaneously improve the strength and electrical conductivity of Cu-Ni-Si alloy. However, the complex relationship between precipitates and two-stage aging process presents a significant challenge for the optimization of process parameters. In this study, machine learning models were established based on orthogonal experiment to mine the relationship between two-stage aging parameters and properties of Cu-5.3Ni-1.3Si-0.12Nb alloy with preferred formation of DPs. Two-stage aging parameters of 400 °C/75 min + 400 °C/30 min were then obtained by multi-objective optimization combined with an experimental iteration strategy, resulting in a tensile strength of 875 MPa and a conductivity of 41.43 %IACS, respectively. Such an excellent comprehensive performance of the alloy is attributed to the combined precipitation of DPs and CPs (with a total volume fraction of 5.4 % and a volume ratio of CPs to DPs of 6.7). This study could provide a new approach and insight for improving the comprehensive properties of the Cu-Ni-Si alloys.

Key words: Cu-Ni-Si alloy, Machine learning, Strength, Electrical conductivity, Discontinuous precipitates