Enhanced strength and electrical conductivity in ultrafine-grained Cu-Cr alloy processed by severe plastic deformation

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Islamgaliev, R.K.^1 ; Nesterov, K.M.^1 ; Champion, Y.^2 ; Valiev, R.Z.^1

Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marx Street, 450000 Ufa, Russia^1

CNRS, Université Paris-Est Créteil, 2 rue Henri Dunant, 94320 Thiais, France^2

关键词: Dynamic precipitation;    Electrical conductivity;    Enhanced properties;    Severe plastic deformations;    Ultimate tensile strength;    Ultra-fine-grained;    Ultrafine-grained copper;    Ultrafine-grained Cu;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012118/pdf
DOI  :  10.1088/1757-899X/63/1/012118

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The influence of severe plastic deformation on strength and electrical conductivity in the Cu-Cr copper alloy has been studied. Microstructure of ultrafine-grained samples was investigated by transmission electron microscopy and X-ray diffraction with special attention on precipitation of small chromium particles after various thermal treatments. Effect of dynamic precipitation leading to enhancement of strength and electrical conductivity was observed. It is shown that ultrafine-grained samples enable to demonstrate the combination of enhanced thermal stability up to 500°C, high ultimate tensile strength of 790-840 MPa and enhanced electrical conductivity of 81-85% IACS. The contributions of grain boundaries and precipitates to enhanced properties of ultrafine-grained copper alloy are discussed.