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← ScienceWhich influence minimizes dislocation motion within metallic crystal columns?
A)Increased grain boundary cross section✓
B)Decreased homologous exposure temperature
C)Enhanced vacancy concentration annealing
D)Reduced applied compressive stress profile
💡 Explanation
Increased grain boundary area impedes dislocation motion because increased interfaces arrest movement, affecting plastic deformation mechanisms directly. Therefore dislocation slip decreases with more boundaries rather than higher temperatures that increase motion, decreased vacancies, or increased applied pressure.
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