Relationship Between Fracture Fractal and Mechanical Properties of 5083 Aluminum Alloy Sheet Prepared by Alternate Ring-Groove Pressing and Torsion

Abstract

In this study, the tensile fracture morphology of a 5083 aluminum alloy sheet prepared by alternate ring-groove pressing torsion and torsional flattening at room temperature (ARPT-TF-R) under different numbers of torsional flattening passes was analyzed. The box dimension method was used to calculate the fractal dimension, and formulas for the quantitative relationships between the tensile properties and Vickers hardness of 5083 aluminum alloy sheet under different process conditions and the fractal dimension were established. The results indicated that the fracture mode of the sheet prepared by one pass was microporous aggregation fracture, and the number of large-sized dimples was small. The plate prepared by two passes had a greater number of micropores, and the dimple size was relatively small. The fractal dimension of the aluminum alloy sheet prepared by ARPT-TF-R at room temperature was 1.77–1.84. As the number of torsional flattening passes increased, the yield strength, tensile strength, Vickers hardness, and fractal dimension of the aluminum alloy sheet increased.