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← ScienceWhich outcome occurs when dissimilar metals with dissolved hydrogen experience fracture?
A)Hydrogen embrittlement reduces boundary cohesion✓
B)Elevated temperatures induce creep failure
C)Rapid oxidation forms passivation layers
D)Galvanic corrosion protects anodic material
💡 Explanation
Hydrogen embrittlement occurs because hydrogen atoms diffuse into the metal lattice, accumulating at grain boundaries. This reduces the cohesive forces through a mechanism of pressure-induced decohesion, therefore, cracking is easier along those boundaries, rather than uniform deformation.
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