On definitions and assumptions in the dislocation theory for solid solutions

Abstract

A recent paper criticized the standard treatment of Cottrell atmospheres, relevant to solid-solution hardening. We show that the treatment in current texts is correct within the standard assumptions of dislocation theory. Nonlinear treatments of the atmosphere are discussed. We also show that no current theory of such atmospheres includes complete nonlinear screening of the dislocation strain field.

Keywords:

• dislocation theory
• solid solutions
• solute atmospheres

Acknowledgements

The author is pleased to acknowledge helpful discussions with J. Lothe and with the authors of Ref. [21], as well as a correction to coordinate designation provided by J.W. Cahn.