Investigation of in-plane anisotropy in tensile properties and creep aging behavior of largely pre-deformed Al–Cu–Li alloy
Year: 2025
Type: article
Abstract: Largely pre-deformed Al–Cu–Li alloy sheets exhibit enhanced creep formability and strength but introduce substantial in-plane anisotropy. This study systematically investigates the effects of pre-deformation (75 % vs. 5 % reduction) on creep aging behavior and tensile properties at orientations of 0°, 45° and 90° relative to the rolling direction. Results reveal that 75 % pre-deformation leads to a fibrous microstructure and increased dislocation density , particularly at 0°, resulting in the highest creep strain (0.244 %) and tensile strength (592 MPa). However, this orientation also exhibits the largest in-plane anisotropy, with in-plane anisotropy index of 46.9 % for creep strain and 5.6 % for tensile strength . Digital image correlation demonstrates that strain localization and crack propagation align with elongated grains, while transmission electron microscopy confirms slender dislocation walls at 0° and thick walls at 90°, which reveals that anisotropic dislocation structures and grain morphology synergistically govern the mechanical anisotropy. These results emphasize that while large pre-deformation improves creep and strength at 0°, it intensifies anisotropy, necessitating careful design considerations for aerospace applications .
Authors: Xiaodong Liu, Jiachi Xiao, Lingying Ye, Yanjin Shen, Yu Dong
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,640
Awards: G374470618, G5170471407, G7572175957
OpenAlex ID: W4409158324