Which undesired outcome arises when point defects disrupt a crystal lattice periodicity during high temperature annealing of a metal?

💡 Explanation

High temperature annealing of metal can, paradoxically, *increase* the ductile-brittle transition temperature, because point defects promote grain boundary diffusion. This modifies the composition near grain boundaries via the mechanism of creep, therefore promoting intergranular fracture at lower temperatures, rather than transgranular cleavage.

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