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young's modulus/elongation at break

one of the criteria for a question is-

Compare and contrast theoretical material properties of metal and non-metals with practical test data.

my materials are copper and graphite, i am struggling to find any relevant test data.

the question is about ductility and why copper is used for wiring and graphite is not. now the answer is straight forward i have done the write up, however finding any graphs or charts to back up my answers is proving difficult.
i have seen that copper has a 117GPa young's modulus
and graphite has 4.1 GPa young's modulus
my book states the lower the young's modulus the more ductile something is but i know that graphite is brittle and not ductile.

any links to information for both copper and graphite ductility would be most useful.
thanks in advance
elongation at break is also relevant to ductility, however while researching I'm finding a varied elongation at break for copper i am seeing 10-20% and 30% depending on the website with out specifying if its copper or copper alloy, if they where both talking about pure copper the values should be the same .

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