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← ScienceWhich outcome results when exceeding the critical shear stress in crystalline silicon's lattice?
A)Formation of deformation twins occurs✓
B)Electron mobility substantially increases
C)Complete amorphization is initiated locally
D)Forbidden band gap energy increases
💡 Explanation
The formation of deformation twins occurs because exceeding the critical shear stress leads to sudden, localized slip via the mechanism of twin nucleation. Therefore, plastic deformation occurs via twinning rather than dislocation glide because twinning requires greater energy.
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