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Our study investigates how hydrogen trapped at interfaces of MgZn_2 precipitates affects hydrogen embrittlement in Al–Zn–Mg alloys. Al–Zn–Mg alloys featuring various aged microstructures were prepared..., and their hydrogen embrittlement behaviors were monitored in situ during tensile tests via synchrotron radiation X-ray microtomography. The changes in the interfacial properties of MgZn_2 instigated a discernible transition in the quasicleavage and intergranular fractures. First-principles calculations revealed that the hydrogen trapping energy at semicoherent interfaces of MgZn_2 is significantly high at 0.56 eV/atom, and multiple hydrogen trapping leads to a substantial reduction in interfacial cohesive energy. Hydrogen partitioning analysis of all trapping sites, including vacancies, grain boundaries, and MgZn_2 interfaces, demonstrated that in overaged alloys, more than 90% of the hydrogen was trapped at semicoherent interfaces. The hydrogen trapped at the semicoherent interface of MgZn_2 decreased the interfacial cohesive energy, causing semispontaneous decohesion and quasicleavage fracture in the Al–Zn–Mg alloys.続きを見る
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Mendeley出力
