3. Consider the following binary phase diagram for the elements Al and Si in the Al-rich portion of the diagram. Al does not form a terminal solid solution in/with Si. 700 660â 650 Liquid 600 577 â 550 500 α+Si 450 10 15 20 25 Al Atomic percentage of silicon Identify the following: (a) Melting temperature of pure Al (b) Eutectic composition of the AlSi system (c) Atomic percentage of Si in the α phase of a 5% Si-Al alloy held at 600 °C (d) The relative abundance of the primary α phase when the 5% Si Al alloy is cooled to 577 °C (e) Construct a drawing representing the microstructure of the 5% Si-Al alloy at 500 °C