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Which mechanism increases material hardness when interstitial atoms distort the crystal?

A)Strain hardening via dislocation pinning
B)Grain boundary annihilation increases diffusion
C)Electron mobility reduction forms precipitates
D)Phonon scattering lowers thermal vibration

💡 Explanation

Strain hardening occurs because dislocation pinning impedes slip, therefore hardness improves, rather than grain annihilation that reduces resistance by eliminating defects acting like barriers. Interstitial atoms cause the crystal's lattice structure deformation.

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