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← ScienceWhich outcome results when exceeding the critical shear stress within a copper crystal?
A)Formation of a Kirkendall void
B)Instantaneous brittle fracture occurs
C)Dislocations begin propagating rapidly✓
D)Dynamic recrystallization annihilates defects
💡 Explanation
Plastic deformation initiates because exceeding the critical shear stress causes the mechanism of dislocation glide, allowing atoms to move; therefore, dislocations propagate rapidly, rather than brittle fracture, needing higher stress or Kirkendall voids that need diffusion.
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