<p>This study examines the response of 6014-T4P aluminum alloy to tensile loading under various strain rates at room temperature, focusing on its mechanical behavior and associated microstructural changes. High strain rate behavior was characterized using a split-Hopkinson tensile bar (SHTB) at strain rates between 2280 and 4150 s⁻¹, while the quasi-static response was evaluated at 0.001 s⁻¹. The experimental results demonstrate a clear enhancement in both flow stress and plastic deformation capacity with increasing strain rate. Under dynamic conditions, AA 6014-T4P achieved a 36.7% rise in ultimate tensile strength and a 55.2% gain in elongation compared to quasi-static loading. Furthermore, a modified Johnson–Cook (MJC) constitutive model was formulated, showing strong correlation with the experimental data. Additionally, fracture surface analysis indicated that high strain rate deformation produced a greater number of deeper dimples compared to the quasi-static case, suggesting enhanced ductility. Microstructural characterization further showed that elevated strain rates promoted an increased proportion of low-angle grain boundaries, and a higher density of geometrically necessary dislocations. The elevated intensified dislocation entanglement and precipitation hardening contribute to the superior plasticity and strength of AA 6014-T4P compared to those observed under high strain rate loading.</p>