The hydrogen embrittlement of Ni 201 has been investigated by pressurizing small thin discs from one side with gaseous hydrogen. The time to rupture was found to increase with decreasing pressure. The lowest rupture pressures were achieved after times about equal to the time required for penetration of the discs by lattice diffusion of hydrogen. It was therefore concluded that dislocation transport was not very significant in this particular system. Discs ruptured with air failed by chisel point fracture. Discs ruptured with hydrogen showed increasing amounts of intergranular fracture with increasing time of exposure. Intergranular fracture was predominant near the surface exposed to hydrogen.
MST/454
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