Abstract
The yield stress of high purity Fe (less than 10 wt. ppm (C+N) content) containing 0, 1.14, 2, 4 and 6 at % Mo in solution was investigated at temperatures from 77 to 300°K. At 300°K, the yield stress varies linearly with Mo content. At low temperatures, alloy softening occurs with a minimum in the yield stress at about 2 at. % Mo; for higher concentrations, the variation of yield stress with Mo concentration is linear with the same slope as that obtained at 300°K. Our results suggest that the Mo atoms in solution have mainly an athermal influence on the yield stress and that the alloy softening is due to a scavenging process. The influence of Mo clusters in the Fe-6% Mo alloy was studied and it was found that they do not contribute to the yield stress.
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