Consider the binary eutectic copper$-$silver phase diagram. Make phase analyses of an $88$ wt $\%Ag-12wt\%Cu$ alloy at the temperatures: $20$ points

a$)1000C$

b$)800C$

c$)780C+T$

d$)780C-T$

In the phase analyses, include: $($i$)$ phases present, $($ii$)$ chemical compositions of each phase, $($iii$)$ amounts of each phase, $($iv$)$ sketch of the microstructure of each phase by using circular fields.