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Precipitation strengthening is commonly used in aluminium alloys. (a) (5 marks) Briefly explain what are GP zones and their key features in the Al-Cu alloy?

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Precipitation strengthening is commonly used in aluminium alloys. (a) (5 marks) Briefly explain what are GP zones and their key features in the Al-Cu alloy? You may draw schematic diagrams to help the illustration.(b) (10 marks) What kind of precipitate microstructure is desirable in general? Briefly explain why a small undercooling AT is not ideal for obtaining the desired mi- crostructure

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