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Which mechanism causes increased brittleness in metallic crystals subjected to transmutation?

A)Peierls stress exceeds dislocation energy
B)Interstitial diffusion causes precipitation hardening
C)Grain boundary sliding overwhels recovery
D)Phonon scattering inhibits dislocation propagation

💡 Explanation

Interstitial diffusion causes precipitation hardening. Because newly formed solute atoms segregate and form precipitates, these obstruct dislocation motion, therefore causing brittleness rather than ductility, because they impede the movement of grain boundaries.

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