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In which among the following system does the equilibrium phase nucleate homogeneously?

In which among the following system does the equilibrium phase nucleate homogeneously? Correct Answer Cu-Co

In the Cu-Co system Cu alloys containing 1-3% Co can be solution treated and quenched to a temperature where Co precipitates. Both Cu and Co are fee with only a 2% difference in lattice parameter. Therefore, very little coherency strain is associated with the formation of coherent Co particles.

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