Abstract
Specimens were strained in tension from room temperature to 550°C at strain rates in the range of 10 −3–10 −4/sec on iodide vanadium containing varying amounts of nitrogen in solid solution. Maxima in the tensile strength, yield strength, and strain-hardening coefficient, a minimum in the strain-rate sensitivity and the occurrence of serrated stress-strain curves were observed in the temperature range of 300° to 450°C. The activation energy for strain aging in vanadium was found to be 37.3 ± 3.7kcal/mole from the strain rate dependence of the strain-aging peak and 36.2 ± 4.5kcal/mole from a return-of-yield point method. These values agree well with those reported for the diffusion of nitrogen in vanadium as determined by other methods. Thus, the results of this investigation indicate that nitrogen is associated with many of the strain-aging effects observed in vanadium.
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