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← ScienceWhich outcome occurs when high stress changes grain structures?
A)Increased fatigue crack propagation rate✓
B)Enhanced galvanic corrosion protection
C)Raising the ductile-brittle transition temperature
D)Decreased wear rates during boundary lubrication
💡 Explanation
Increased stress at grain boundaries induces dislocation slip, causing microcrack initiation, leading to fatigue crack propagation, because this is strain induced and accelerates failure stages. Therefore, fracture rate rises, rather than improved corrosion due to cracks promoting failure.
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