Problem $2$: Requirements for Age Hardening

Figure $12-33$ shows a hypothetical phase diagram.

Figure $12-33$: Hypothetical phase diagram

a$)$ Fill in the two$-$phase regions in the hypothetical phase diagram at right.

b$)$ Determine which alloys in the table below might be good candidates for age hardening, and explain

your reasoning.

c$)$ For those that are good candidates, describe the heat treatment required and include

recommended temperatures