Q$.2($a$)$ Draw a phase diagrarn of an isomorphous alloy and show changes in microstructure under

equilibrium cooling.

$($b$)$ During cooling, write the type

of reaction$($s$)$ at

$($i$)0\mathrm{.}18wt\%C$ at $1493C$

$($ii$)0\mathrm{.}8Wt\%C$ at $725C$

$($iii$)4\mathrm{.}3wt\%C$ at $1147C$

in the given phase diagram.

$(3)$