Role of interfaces on microstructure refinement and mechanical properties of severe plastically deformed copper and copper-silver eutectic

38th Risø International Symposium on Materials Science

Ghosh, P.^1 ; Kormout, K.S.^1 ; Pippan, R.^1

Erich Schmid Institute of Materials Science, Austrain Academy of Sciences, Leoben

8700, Austria^1

关键词: Deformed copper;    Eutectic alloys;    High pressure torsions;    Linear hardening;    Microstructural refinement;    Microstructure refinement;    Possible mechanisms;    Surface oxide layer;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/219/1/012021/pdf
DOI  :  10.1088/1757-899X/219/1/012021

来源: IOP

【 摘 要 】

The process of microstructural refinement during deformation by high pressure torsion (HPT) of commercially pure copper (Cu-B), copper powders (Cu-P) and cast copper silver eutectic alloy (CuAg-E) were investigated. The presence of a surface oxide layer or of immiscible silver lamellae leads to much finer grain size. A saturation in microstructural refinement was attained in both Cu-B and Cu-P samples, while the CuAg-E sample showed a linear hardening propensity down to a 30 nm interlamellae spacing. The possible mechanisms for strengthening in the CuAg-E alloy are further discussed in view of the evolution of interlamellae spacing with applied shear strain.