Nonlinear ultrasonic response of typical defects in face-centered cubic aluminum

JC Shen and Y Zheng and SJ Li and XQ Shen and JJ Zhou and JG Yu and WY Yue, PHYSICA SCRIPTA, 100, 085412 (2025).

DOI: 10.1088/1402-4896/adf151

The nonlinear ultrasonic response to early plastic damage of metal materials is the result of multiple defects. The contributions of typical defects (vacancy atoms, interstitial atoms, edge dislocations, screw dislocations, grain boundaries, grains, twins and extrinsic stacking faults) to the ultrasonic nonlinear effects has not been reported. In this paper, the ultrasonic propagation model of a single defect in single crystal aluminum was established using the molecular dynamics method. The nonlinear ultrasonic response of each typical defect and the intrinsic relationship between the defect parameters and the acoustic nonlinearity were investigated. Meanwhile, the influence of these typical defects on linear acoustic parameters was also studied. Finally, a multi-defect coupling model incorporating vacancy atoms and other defects was established to analyze the interaction mechanisms of ultrasonic nonlinear parameters with positive/negative contribution coupling. This provides microscopic insights for determining critical defect configurations and assessing damage states associated with mechanical property degradation in metallic materials.

Return to Publications page