(Solved): Question B5 (11 marks) Below is a Mg-Al phase diagram. You have been supplied with an alloy with \( ...

Question B5 (11 marks) Below is a Mg-Al phase diagram. You have been supplied with an alloy with \( 80 \% \) \( \mathrm{Mg}-20 \% \mathrm{Al} \) (a) This alloy has been cooled from \( 600 \mathrm{C} \) down to room temperature. Draw and label the alloy microstructure at \( 550 \mathrm{C}, 480 \mathrm{C} \) and \( 300 \mathrm{C} \). (6 Marks) (b) For 480 C describe the alloy constitution - phases present, composition of phases present and weight fraction of phases present. ( 3 marks) (c) For 300 C determine how much pro-eutectic is present. (2 marks). Mg-Al phase diagram