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The following table shows the isothermal annealing conditions to reach 1% and 99% transformation for the precipitation of the -phase in the 4 wt% Cu

The following table shows the isothermal annealing conditions to reach 1% and 99% transformation for the precipitation of the-phase in the 4 wt% Cu alloy:

T (C)

t1%

t99%

150

11 minutes

300 hours

250

11 seconds

5 hours

Using an Arrhenius-type kinetics model, what is the activation energy for this isothermal phase transformation?

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