Abstract
The effect of grain boundary sulfur segregation on the embrittlement of hydrogen charged nickel has been studied using tensile tests at 77 K. The extent of intergranular fracture was studied as a function of the amount of segregated sulfur at the grain boundaries and as a function of the solute hydrogen concentration. Segregated sulfur decreased the amount of solute hydrogen required to cause 100% intergranular fracture. The amount of local deformation which accompanied the intergranular fracture also depended on the extent of sulfur and hydrogen segregation and was examined using SEM techniques. These results are discussed based on the effects of sulfur on hydrogen segregation and on the synergistic effects of sulfur and hydrogen on fracture at the grain boundary.
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