1：Experimental Design and Method Selection:

The study used directed laser deposition (DLD) technology to prepare Al2O3/Al2TiO5 composite ceramics with different TiO2 doping amounts. The methodology involved the in-situ reaction of Al2O3 and TiO2 to form composite ceramics.

2：Sample Selection and Data Sources:

Commercially pure Al2O3 and TiO2 powders were used as raw materials. Samples with TiO2 content ranging from 0 to 50 mol% were prepared.

3：List of Experimental Equipment and Materials:

The DLD system consisted of an Nd:YAG continuous-wave laser, a three-cylinder powder feeder, and a three-axis CNC machine. High purity argon was used to deliver powdered raw materials.

4：Experimental Procedures and Operational Workflow:

The laser beam was set to negative defocusing state, and the spot size on the substrate surface was adjusted to about 2 mm. The process parameters were set as laser power 250 W, scanning speed 400 mm/min, and layer increment 0.4 mm.

5：4 mm. Data Analysis Methods:

5. Data Analysis Methods: Phase composition was characterized by X-ray diffraction (XRD), microstructure and elemental composition by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Vickers indentation method was used to test microhardness and fracture toughness, and three-point bending method was used to test flexural strength.