Low Temperature Deformation in Fe-Cr and Fe-V Alloys

Abstract

The yield strength of Fe-7%Cr alloy and Fe-3, -7%V alloys was measured in the temperature range from 400° to 77°K. These alloys showed no appreciable alloy-softening, but stronger temperature dependence of yield strength than that of pure iron at temperatures lower than 150°K. In addition, alloying of chromium or vanadium lowered the critical temperatures and also the activation area for deformation. These behaviours are in contrast with those generally found in the alloys which show alloy-softening. The strong temperature dependence of yield strength in these alloys seems to be associated with the strong interaction between the alloying elements and interstitial impurity atoms.