CREEP-BEHAVIOR OF POTASSIUM-CHLORIDE RUBIDIUM CHLORIDE SOLID-SOLUTIONALLOYS

The creep behavior of three KCl-RbCl solid solution alloys and pure KC l and pure RbCl single crystals compressed along the [100] direction w as investigated at 600-degrees-C at stresses between 0.5 and 15 MPa. T he reduced primary creep stage, a value of the stress exponent of abou t 3 for the KCl-20 mol % RbCl and KCl-30 mol % RbCl alloys versus abou t 5 for pure KCl and pure RbCl and the results of the stress reduction tests for these alloys are in good agreement with creep behavior obse rved in class I metallic solid solution alloys, where the creep rate i s controlled by a dislocation glide process. The dislocation substruct ure developed in the KCl-RbCl alloys consisted of well-developed subgr ains.