1：Experimental Design and Method Selection:

The study involved the use of selective laser melting (SLM) to manufacture Nitinol samples, followed by ultrasonic nanocrystal surface modification (UNSM) as a post-processing treatment. The effect of UNSM on the microstructure and martensitic transformation was investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential scanning calorimetry (DSC).

2：Sample Selection and Data Sources:

Cylindrical samples of Ni50.8Ti49.2 (at.%) were manufactured using SLM. The samples were then subjected to UNSM treatment.

3：8Ti2 (at.%) were manufactured using SLM. The samples were then subjected to UNSM treatment. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: An SLM system (mod. PXM from Phenix/3D Systems) was used for manufacturing the samples. UNSM was performed using a tungsten carbide tip. Characterization was done using SEM, XRD, DSC, and electron backscatter diffraction (EBSD).

4：Experimental Procedures and Operational Workflow:

The UNSM process was performed on the upper surface of the SLMed cylinders. The samples were then characterized for microstructure, mechanical properties, and martensitic transformation behavior.

5：Data Analysis Methods:

The data from SEM, XRD, DSC, and EBSD were analyzed to understand the effect of UNSM on the microstructure and martensitic transformation of the Nitinol samples.