Microstructure and properties of Cu-TiB2 composites prepared by mechanical stirring-assisted double-melt in-situ reaction

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-10-19 DOI:10.1007/s12598-024-03018-8

Tao Zhou, Xu Wang, Liu-Xin Qin, Yan-Bin Jiang, Meng Wang, Yan-Jun Ding, Bai-Rui Qi, Zhu Xiao, Yan-Lin Jia, Zhou Li

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引用次数: 0

Abstract

A novel mechanical stirring-assisted double-melt in-situ reaction casting process was developed to prepare Cu-1TiB₂ (wt%) composites. The effects of preparation parameters (melting reaction temperature, stirring rate and stirring time) on the microstructure and properties of Cu-1TiB₂ composites were investigated. The melt viscosity and particle motion during stirring process were analyzed. The strong turbulence and shear effects generated by mechanical stirring in the melt not only significantly improve the particle distribution but also contribute to adequate in-situ reactions and precise control of the chemical composition. The optimal preparation parameters were 1200 °C, a stirring rate of 100 r·min⁻¹ and a stirring time of 1 min. Combined with the cold rolling process, the tensile strength, elongation and electrical conductivity of the composite reached 475 MPa, 6.0% and 88.4% IACS, respectively, which were significantly better than the composite prepared by manual stirring. The good plasticity is attributed to the uniform distribution of TiB₂ particles, effectively retarding the crack propagation. The dispersion of particles promotes heterogeneous nucleation of Cu matrix and inhibits grain growth. On the other hand, dispersed particles contribute to grain shear fracture and dislocation multiplication during cold deformation. Therefore, the composite achieves higher dislocation strengthening and grain boundary strengthening.

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.