Question A.3 (a) Discuss any three strengthening mechanisms for metallic alloys (in your answer you can use schematic diagrams and specific alloy systems). [12 Marks] (b) Explain the difference between cast and wrought aluminium alloys and discuss how the processing and application of these alloys differ. [7 Marks] (c) Discuss the common types of defects that originate during casting and state two suitable methods to eliminate or reduce these defects. [6 Marks]