## 3 Results and Analysis
### Morphologies and Elemental Distributions of AgW Materials  
The cross-sectional and longitudinal morphologies, along with the elemental mapping of AgW (70 wt%), AgW (75 wt%), and AgW (80 wt%) were similar. However, compared with the former, AgW (85 wt%) had a different morphology. AgW (80 wt%) and AgW (85 wt%) are presented in Figures 11-14.  
Figure 11: Cross-sectional SEM images of AgW (80 wt%): (**a**) 10 \(\upmu\)m; (**b**) 30 \(\upmu\)m; (**c**) 30 \(\upmu\)m. (**d**) Elemental surface scans corresponding to (**c**).  
Figure 10: Longitudinal sections of the metallographic microstructures of AgW materials: (**a**) AgW (70 wt%); (**b**) AgW (75 wt%); (**c**) AgW (80 wt%); (**d**) AgW (85 wt%).  
Figure 12: Cross-sectional SEM images of AgW (80 wt%): (**a**) 10 \(\upmu\)m; (**b**) 30 \(\upmu\)m; (**c**) 30 \(\upmu\)m. (**d**) Elemental surface scans corresponding to (**c**).  
Figure 13: Cross-sectional SEM images of AgW (85 wt%): (**a**) 100 \(\upmu\)m; (**b**) 30 \(\upmu\)m. (**c**) Elemental surface scans corresponding to (**b**).  
Figure 11a-c present the cross-sectional morphology of AgW (80 wt%). In Figure 11a,b, a Ag layer can be observed. The elemental distribution in Figure 11c is consistent with the intended composition of the AgW (80 wt%) material. Furthermore, Ag was uniformly distributed in the interstices between the W particles.  
Figure 12a,c present the longitudinal morphology of AgW (80 wt%), which was characterised by a distinct Ag layer. Figure 12b shows a uniform composition, with no noticeable defects. No noticeable Ag layer was present, and Ag was uniformly distributed in the interstices between the W particles. The overall elemental mapping in Figure 12(d4) reveals the encapsulation of Ag by Ni, which formed a Ni layer.  
Figure 13a,b present the cross-sectional morphology of AgW (85 wt%), which was characterised by no significant Ag layer but noticeable voids. The elemental distribution in Figure 13c is consistent with the intended composition of the AgW (85 wt%) material, with Ag uniformly distributed in the interstices between W particles. However, the distribution of Ni exhibited aggregated regions, which appeared to be distributed in patches. In the central area of Ni, no Ag was detected.  
Figure 14a-c illustrate the longitudinal morphology of AgW (85 wt%), revealing no significant Ag layer but noticeable voids. The elemental distribution in Figure 14d is consistent with the intended composition of the AgW (85 wt%) material, with Ag uniformly distributed in the interstices between W particles. However, the distribution of Ni exhibited aggregated regions, which appeared to be distributed in patches. In the central area of Ni, no Ag was detected. This is attributed to the relatively low Ag content, as Ag penetrated the W skeleton but did not completely fill the voids within the W skeleton, as shown in Figures 13 and 14. In contrast, Ni has a melting point of 1453 \({}^{\circ}\)C; therefore, at the experimental temperature of 1050 \({}^{\circ}\)C, it did not form a liquid phase with sufficient fluidity. Conversely, the small amount of Ag formed a liquid state, and because of its good wettability with W, it fully penetrated the pores within the W skeleton. Therefore, the phenomenon of Ni encapsulating Ag cannot be observed in Figures 13a,b and 14a-c.  
Figure 14: Cross-sectional SEM images of AgW (85 wt%): (**a**) 100 \(\upmu\)m; (**b**) 80 \(\upmu\)m; (**c**) 30 \(\upmu\)m. (**d**) Elemental surface scans corresponding to (**c**).