High‐Temperature Creep of NaCl‐KCl Solid‐Solution Alloys

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Abstract
The high‐temperature creep of polycrystalline NaCl‐KCl solid solutions and pure KCI was studied under constant compression stress at 600°C. The creep rate of the ionic solid‐solution alloys appeared to obey approximately Weertman's microcreep equation, = KDS, where D, is taken to be the diffusion coefficient of the cation and G the shear modulus of the material. Transient creep in the ionic alloys was similar to that in metallic solid‐solution alloys which depends on the third power of stress. These results support the view that creep in many polycrystalline metallic and nonmetallic alloys is controlled by the same mechanisms. The creep rate of pure KCI depended on stress to the 5.0 power, a dependence similar to that of most pure metals and to that reported for pure NaCl.

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