fig4
Figure 4. The macrophotographs of Ti, PEO, and PEO-MH after tensile tests and SEM images of PEO and PEO-MH at the necking position: (A) the macrophotographs of the standard sample without tensile and after tensile testing; (B) SEM image of PEO at the necking position; (C) SEM image of the PEO-MH at the necking position. SEM: Scanning electron microscopy; PEO: plasma electrolytic oxidation; MH: microwave hydrothermal.
