Review of Hydrogen Embrittlement in Metals: Hydrogen Diffusion, Hydrogen Characterization, Hydrogen Embrittlement Mechanism and Prevention
Xinfeng Li1,2(), Xianfeng Ma1, Jin Zhang3, Eiji Akiyama4, Yanfei Wang5(), Xiaolong Song2

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Fig.5. Schematic diagrams of HE mechanisms. a HIPT [64]: hydrogen-induced phase transformation theory; b HEDE [64]: hydrogen-enhanced decohesion mechanism; c HELP [64]: hydrogen-enhanced localized plasticity mechanism; d NVC [5]: nanovoid coalescence mechanism; e HEDE + HELP [5]: combined effect of hydrogen-enhanced decohesion mechanism and hydrogen-enhanced localized plasticity mechanism