Hardening mechanisms of aluminum alloys under dynamic-channel angular pressing

Open School-Conference of NIS Countries Ultrafine Grained and Nanostructured Materials

Brodova, I.G.^1 ; Petrova, A.N.^1,2

M.N. Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 18 S. Kovalevskaya St., Ekaterinburg

620108, Russia^1

B.N. Yeltsin Ural Federal University, 19 Mir St., Ekaterinburg

620002, Russia^2

关键词: Boundary components;    Compression tensions;    Dynamic channel angular pressing;    Hardening mechanism;    High dislocation density;    High-speed deformation;    Localized deformations;    Structure formations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012025/pdf
DOI  :  10.1088/1757-899X/447/1/012025

来源: IOP

【 摘 要 】

An experiment on high-speed deformation of aluminum alloy A3003 by dynamic channel angular pressing is described. During dynamic pressing, the material is exposed to two deformation modes. They are compression-tension due to the interaction of shock and rarefaction waves when the sample hits the bottom of the first channel, and a simple shear localized at the joint of the channels. The features of structure formation under the action of each deformation mode are determined. It was found that a high dislocation density and the presence of localized deformation zones caused by shock-wave loading, have a significant influence on the formation of the structure upon dynamic channel-angular pressing. The mechanisms of hardening and the contribution of dislocation and grain-boundary components to the overall hardening of the alloy are determined.