Investigation of In-Plane Anisotropy in Tensile Properties and Creep Aging Behavior of Largely Pre-Deformed Al-Cu-Li Alloy

Abstract

Largely pre-deformed Al-Cu-Li alloy sheets significantly enhances their creep formability and strength, but also introduces substantial in-plane anisotropy. This study investigates the effects of pre-deformation on creep aging behavior and tensile properties at various orientations relative to the rolling direction. Results reveal that large pre-deformation leads to a fibrous microstructure and increased dislocation density, particularly at 0° to the rolling direction, resulting in the highest creep strain and tensile strength. However, this orientation also exhibits the largest in-plane anisotropy for both creep strain and tensile properties. DIC analysis and microstructural characterization indicate that the anisotropy is primarily caused by the grain structure and dislocation distribution.

Keywords: Al-Cu-Li alloy, pre-deformation, creep aging, tensile properties, in-plane anisotropy