Crystallographic character of grain boundaries resistant to hydrogen-assisted fracture in Ni-base alloy 725.

ABSTRACT: Hydrogen embrittlement (HE) causes sudden, costly failures of metal components across a wide range of industries. Yet, despite over a century of research, the physical mechanisms of HE are too poorly understood to predict HE-induced failures with confidence. We use non-destructive, synchrotron-based techniques to investigate the relationship between the crystallographic character of grain boundaries and their susceptibility to hydrogen-assisted fracture in a nickel superalloy. Our data lead us to identify a class of grain boundaries with striking resistance to hydrogen-assisted crack propagation: boundaries with low-index planes (BLIPs). BLIPs are boundaries where at least one of the neighboring grains has a low Miller index facet-{001}, {011}, or {111}-along the grain boundary plane. Thes

SUBMITTER: Hanson JP 

PROVIDER: S-EPMC6107512 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature