Abstract
A theory to predict the initial flow stress of an arbitrary N-component fcc random alloy is extended to predict the additional strengthening when a dilute concentration of a substitutional element is introduced. Assuming properties for the N-component alloy to be established, the theory requires only information on the elastic and lattice constants of the new N+1-alloy, and makes a parameter-free prediction for the strength-increment due to the added N+1st element. The theory is applied to the CoCrFeNiAlx and CoCrFeNiMnAlx systems, achieving good agreement with experiments. The theory thus serves as a valuable tool for guiding design of new fcc random alloys.
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