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← ScienceWhich outcome accelerates oxidation in high-temperature alloy components?
A)Concentrated stress increases creep rate
B)Grain boundary diffusion increases oxygen flux✓
C)Phase transformation enhances vacancy creation
D)Surface tension causes grain alignment
💡 Explanation
Grain boundary diffusion increases oxygen transport at elevated temperatures, because the smaller atomic packing enables faster diffusion of oxygen into the material. Therefore, oxidation accelerates at high temperatures along grain boundaries, rather than by bulk diffusion within each grain.
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