Question

3) Macroscopic yielding can be described by the Hall-Petch relation. The table below shows the parameters for copper and aluminum. Material 0. (MPa) ky (MPa/m12) Copper 25 .112 Aluminum .068 Taking into consideration the microscopic models that have been discussed, explain in detail why copper has larger values of , and ky; consider each parameter independently. Use specific equations to support your answer.

Answer 1

Hello friend,

High conductivity copper withstands between 3 to 6 times higher 0.2% proof stress than low alloyed aluminium in the annealed condition ( annealing is the process of heat treatment to soften a metal after cold working), thus enabling copper conductors to withstand higher pulling stresses without necking or breaking.

That's why strengthening coefficient k and friction stress has higher value for copper than aluminum.

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