Abstract
Results of tension tests at 279$sup 0$K on fine-grained polycrystalline Mo sheet specimens are reported. It was found that under conditions of simultaneous tension testing and cathodic charging, the hydrogen is present at high fugacity at the tip of a crack or other stress concentrations. Thus hydrogen entry into the lattice in relatively high concentrations is possible at the point where it is most effective in causing fracture, the crack tip. Under these conditions, significant hydrogen embrittlement of molybdenum occurs. (auth)
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