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.6. a Hydrogen-induced intergranular fracture in Ni [23]; b dependence of grain boundary bonding energy on hydrogen concentration in Al [69]; c slip traces on intergranular fracture of hydrogenated Ni-201 [23]; d dislocation cells beneath hydrogen-induced intergranular fracture of Ni-201 [23]