F

Composition $($at$\%$ Ag$)$or a copper$-$silver alloy of composition $25wt\%Ag-75wt\%Cu$ and at $775C$

do the following:

$($a$)$ Determine the mass fractions of $$ and $$ phases.

$($b$)$ Determine the mass fractions of primary a and eutectic micro$-$constituents.

$($c$)$ Determine the mass fraction of eutectic $.$

$($d$)$ provide sketches of the microstructures just above and below the Eutectic temperature

line labelling the phases present in each case

$($e$)$ Now determine the mass fractions of $$ and $$ phases for copper$-$silver composition of

$80wt\%Ag$ at $775C$ and

$($f$)$ determine the mass fractions of primary $$ and eutectic micro$-$constituents.

$($f$)$ Provide a sketch for the eutectic composition