Using the phase diagram and the aging curves on the equation sheet for aluminum alloyed with copperplease answer the following. a) Over what composition range (in wt% Cu), can you produce Al alloys precipitation hardened with Cu? Beas specific as possible. (2points) b) Supposing you have an Al alloy with 4 wt% Cu, describe in as much detail as possible EACH STEP(assuming previous processing unknown) of the procedure you need to use in order to achieve a combination aof tensile strength greater than 400 MPa and ductility of less than 10% elongation. Give detailed temperature and time where necessary. There could be multiple possible answers, give only one answer. (8 points) c) Explain why the material's strength starts to decrease if you age it for too long. (2 points)