fig7

Figure 7. Mechanism and prediction of HE in various alloy systems. (A) Schematic of embrittlement process at crack tip. (B) Schematic of crack tip hydrogen concentrations C_cleave and C_emit that control embrittlement as a function of K_I^app. (C) Predicted embrittlement due to nanodiffusion and blocking of dislocation emission: K_I^app reaches K_IC prior to reaching K_Ie. (D) Predicted embrittled and unembrittled domains of hydrogen concentration for six alloys and Ni. The transition region corresponding to the upper and lower limits of K_Ie is indicated by thick black lines (Reproduced with permission^[68]. Copyright 2021, American Physical Society). HE: Hydrogen embrittlement.