[luce20]

. When heated, at what temperature would an alloy with composition 80% aluminium with 20% silicon

i. begin to melt?

ii. become completely liquid with further heating?





b. Explain why an alloy composition of about 12% silicon (the eutectic composition) is used as a casting alloy for aluminium.





c. There is growing environmental pressure for the removal of lead from consumer products. Describe, in no more than about 400 words, the arguments for and against the removal of lead from these products. Your answer should cover the technical impact of any changes resulting from the removal of lead. And give the arguments that are only indirectly associated with its use – not specific to its use in electronics solder.

[Coursework.info]

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