High temperature creep behavior and substructure in KClKBr solid solution alloys

Abstract

The creep behavior and dislocation substructure of pure KCl, pure KBr and two KClKBr solid solution alloys was investigated at 700°C. The reduced primary stage compared to that for the pure materials, stress exponent close to 3, nature of the creep transient after a stress reduction for the KClKBr alloys is in good agreement with creep behavior observed in class I metallic, KClNaCl and KClRbCl solid solution alloys, where the creep rate is controlled by a viscous dislocation glide process. The creep behavior of the KClKBr solid solution alloys is in agreement with the prediction of the glide-climb criterion for solid solution alloys developed by Mohamed and Langdon. The dislocation substructure of the KClKBr solid solution alloys consisted of well-developed subgrains whose size was larger than that for the pure materials at an equivalent value of normalized stress and varied inversely with applied stress.