Question $3.(11$ Pnts$).$

A copper$-$nickel alloy of composition $40wt\%Cu$ is

slowly heated from a temperature of $1150C(2100F).$

$($a$)$ At what temperature does the first liquid phase

form?

$($b$)$ What is the composition of this liquid phase?

$($c$)$ At what temperature does complete melting of the

alloy occur?

$($d$)$ What is the composition of the last solid remaining

prior to complete melting. A copper$-$nickel alloy of composition $40$wt$.\%$Cu is slowly heated from a temperature of $1150$C$(2100$F$).($a$)$ At what temperature does the first liquid phase form? $($b$)$ What is the composition of this liquid phase? $($c$)$ At what temperature does complete melting of the alloy occur? $($d$)$ What is the composition of the last solid remaining prior to complete melting.