Abstract
The technique of stress relaxation has been used to study plastic deformation prior to yielding or fracture in molybdenum specimens which were tested both above and below the ductile-brittle transition temperature. From the results, it was found that some dislocations were mobile prior to brittle fracture, lending support to the ideas expressed by Cottrell and Stroh, that dislocation interactions may be responsible for the initiation of fracture.
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