Abstract
The hydrogen segregation at different individual grain boundaries (GBs) in pure nickel has been visually revealed by the contrast of the Volta potential measured by scanning Kelvin probe force microscopy (SKPFM) before and after hydrogen charging. By combining the Electron Back Scattered Diffraction (EBSD) analyses, both several typical low-Σ special GBs and the general GBs with different misorientation have been studied. The results show that the segregation degree of hydrogen atoms at GBs strongly depends on the GB structure. The hydrogen trapping capacity of the low-Σ special GBs is sequenced. For the general GBs with different misorientation, the evolution of the hydrogen segregation degree with the GB misorientation coincides with the prediction of the GB structure model.
Published Version
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