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← ScienceWhich failure mode is caused when hydrogen diffuses within crystalline metal?
A)Internal crack nucleation and propagation✓
B)Bulk material phase transformation occurs
C)Surface oxidation product spallation
D)Complete dissolution of metallic lattice
💡 Explanation
Hydrogen embrittlement causes metal fatigue because hydrogen atoms diffuse into the metal lattice, weakening grain boundaries and facilitating **stress corrosion cracking**. Therefore, cracks nucleate rather than phase transformations, material dissolution, because surface oxidation occurs independently.
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