Answer Happy

Can you help me to do (b) plz
Precipitation hardening is a commonly used strengthening method for Al alloys. The figure below shows the Al-rich side of the Al-Cu phase diagram. 700 600 L a+L 1 5.66 548 500 a 400 Temperature (°C) 300 a+ 200 3 100 AI 2 6 8 Weight percent copper Figure 1: Al-rich side of the binary Al-Cu phase diagram. (a) (5 marks) What is the maximum amount of Cu practically possible to add to obtain high strength and tough Al alloys? Explain why there is such a limit. (b) (10 marks) If an Al-4wt% Cu alloy is first solution-treated at 520°C for one hour and then aged at a temperature just below the solvus line temperature (say, 400°C), what will be the equilibrium microstructure? Predict and explain whether the optimum precipitation hardening effect is achieved.