3- The following diagrams represent the solidification in casting of a pure metal and an alloy, respectively. Briefly explain what are the main features of their solidification patterns and the differences that exist between them. (2 marks) Cooling of liquid Shrinkage of solid Freezing begins Freezing ends A Freezing temperature Solidification shrinkage Cooling of solid Liquid - Liquid- Solid Shrinkage of liquid solid Time Time Liquid solution Pouring temperature 1455C (2651 F) Liquidus Liquid cooling Freezing begins L+S Freezing completed Solidus 1083C Solid (1981 F). cooling Total solidification Solid solution Temperature Temperature Temperature Specific density