<p>The femtosecond laser is commonly used for high-quality micromachining of materials. However, the interaction time between the femtosecond laser and the substrate material is extremely short, making it difficult for quantitative measurements and analysis through experiments. In this work, we use a two-temperature model for simulation to study the ablation process of aluminum alloy and aluminum/titanium alloy under femtosecond laser pulse mode. The temperature changes and ablation process of both alloys under femtosecond laser burst irradiation were studied. The study found that when the separation time of sub-pulses was 1 ps, the surface temperature and ablation depth rised with the increase of sub-pulse numbers. A comparison was made between these two alloy types, and enhanced ablation was observed with the heterogeneous aluminum/titanium alloy, up to 34.7% deeper compared to aluminum alloy. Moreover, the detailed theoretical explanation was also discussed. This work provided a basis for efficient ablation of materials with low laser fluence.</p>