Figure 7
The panel a shows a micrograph of the interface between pure T i and T i 6 A l 4 V, with a scale bar of 150 micrometres. Panel b shows three micrographs of the interface between 316 L and H X. The first micrograph shows the interface marked by a dashed boundary and a highlighted region, with a scale bar of 200 micrometres and a vertical axis labelled Z. The second micrograph shows curved microstructural features with marked paths and a highlighted region, with a scale bar of 10 micrometres. The third micrograph shows fine parallel features, two marked locations, and an enlarged inset of the selected region, with a scale bar of 5 micrometres. Panel c shows two micrographs of the interface between I N 718 and 316 L. The left micrograph shows the interface with several marked locations indicated by arrows and a scale bar of 500 micrometres. The right micrograph shows an orientation map with a build direction labelled B D, labels I N 718 and 316 L, a crystallographic key labelled 001, 101, and 111, and a scale bar of 100 micrometres.Microstructural summary of potential alloy systems to be used to integrate the corrosion resistance functionality: (a) a microscopic photo of pureTi-Ti6Al4V pair, highlighting the different grain growth patterns and the absence of a visible diffusion zone (Borisov et al., 2021), (b))SEM photo of 316 L-HX pair, showing some sub-micron cracks and gas pores at the grain boundary and within the grains (Rankouhi et al., 2022), (c) Microscopic and EBDS photos of the 316 L-In718 pair, showing columnar grain growth with some lack of fusion at the interface and on the In718 side (Duval-Chaneac et al., 2021)