Abstract
High purity single crystalline α-Fe whiskers with diameters ranging from 80 to 300 μm and growing directions 〈111〉 and 〈100〉 were tensile tested in air and under cathodic charging-discharging conditions in H 2 SO 4 + As 2 O 3 solutions at room temperature. The complex effect of hydrogen on both the flow stress and the strain hardening rate was found to be dependent on the growing direction of whiskers, their side face indices and the amount of strain. The hydrogen charged whiskers exhibited larger elongation and more straight and homogeneously distributed slip traces than hydrogen free ones. The effect of hydrogen on the stress-strain curve of iron whiskers is considered to be a result of the interaction of hydrogen with dislocations, the hydrogen induced modification of dislocation motion, and changes in dislocation structure.
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