*3.2. Microstructure Analysis*

The microstructure analysis was performed using the Nikon Eclipse L150 microscope (Nikon, Tokyo, Japan). The microstructure was observed under a polarized slider with an Axiocam 105 colour camera for acquiring the pictures. The specimens were cut into 26 × 8 × 6 mm using the CNC wire cutter and prepared for analysis using Keller's reagent etchant.
