2.4.2. Microstructure Analysis of the Cold Rolling Strip Samples

In order to investigate the evolution of the microstructure and properties of the cast rolling strip after cold rolling, 4 groups of cold rolling strips with 0.3 mm thickness were obtained after the cold rolling of 4 groups of cast rolling strips. The 10 mm × 20 mm rectangular samples were cut in the middle of the cold rolling strips. After the electrolytic (90 mL of alcohol, 5 mL of water, 7 mL of perchloric acid) was prepared for electrolytic polishing, the morphology, size, and distribution of the precipitated phase were observed using a Phenom fully automatic scanning electron microscope (Phenom-world BV, The Netherlands). Then, an electrolytic (40 mL of water, 1 mL of HF) was prepared for anode coating, and grain pictures were obtained through a metallographic microscope (OLYMPUS DSX500 metallurgical microscope (Olympus, Japan)).
