• Heterogeneous aluminum/titanium alloy films exhibit up to 34.7% deeper ablation depth compared to pure aluminum alloy under femtosecond laser burst irradiation.
• Increasing the number of sub-pulses with a separation time of 1 ps enhances surface temperature and ablation depth in both alloys.
• Two-temperature model simulations effectively capture the ultrafast thermal dynamics and ablation behavior of heterogeneous alloys.
• The findings provide a theoretical basis for efficient low-fluence laser ablation of advanced materials.