Copper matrix composite with bimodal microstructures fabricated by liquid nitrogen temperature rolling. Issue 10 (3rd July 2022)

• Record Type: Journal Article
• Authors: Jiang, Yihui; Shi, Yaying; Zhang, Xiaojun; Zheng, Qiyuan; Cao, Fei; Liang, Shuhua
• Is Part Of: Materials science and technology. Volume 38:Issue 10(2022)
• Page Start: 654
• Page End: 661
• Publication Date: 2022-07-03
• Subjects: Heterogonous composites -- nanostructures -- thermal stability -- mechanical properties -- electrical conductivity; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2022.2062651
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : Liquid nitrogen temperature (LNT) rolling at a high strain rate was applied to in-situ TiB2 /Cu composites fabricated by powder metallurgy. An artificially controlled heterogeneous distribution of TiB2 particles in a Cu matrix leads to bimodal microstructures in the LNT-rolled composites, i.e. reinforcement-rich regions are constituted by in-situ formed TiB2 particles and nano-Cu grains (about 25 nm), while reinforcement-poor regions are mainly composed of heavily deformed ultrafine Cu grains (about 0.5 µm). Compared with TiB2 /Cu composites processed by normal rolling, LNT-rolled TiB2 /Cu composites with heterogeneous microstructures exhibit good overall performance with high ultimate tensile strength (594 MPa), high elongation (6.3%), high electrical conductivity (82.6% International Annealed Copper Standard) and improved thermal stability, which is favourable for electrical and electronic device applications.