III. Phase Diagrams $(12$ pts$)$

$|12$

The figure shown below shows a portion of the Cu$-$Al phase diagram with wt $\%Al$ going from $0$ wt $\%Al$ to $28wt\%Al.$ Determine the following quantities from this phase diagram.

The maximum solubility of $Al$ in $Cu$ is ${?}^{***********}wt\%Al$ at a temperature of ${?}^{********}C$

$\%Al,$

In the Cu$-$Al phase diagram, the reaction at $11\mathrm{.}3wt\%Al$ at $560C$ is referred to as a:

At the reaction at $11\mathrm{.}3\%Al$ at $560C,$ upon cooling,

phase $-->$

phase $+$

phase

For a corrosion resistant bushing or valve $14\%Al-86\%Cu$ alloy at $400C$ :

a$)$ the phases which are present include:

b$)$ the chemical composition of each phase is:

$wt\%Al$

wt $\%Al$

c$)$ the fraction of each phase is: $($show calculations$)$