%0 Journal Article
%T Ab initio identified design principles of solid-solution strengthening in Al
%A Duancheng Ma
%A Martin Fri¨¢k
%A Johann von Pezold
%A Dierk Raabe and J£¿rg Neugebauer
%J Science and Technology of Advanced Materials
%D 2013
%I Institute of Physics, National Institute for Materials Science
%X Solid-solution strengthening in six Al¨CX binary systems is investigated using first-principle methods. The volumetric mismatch parameter and the solubility enthalpy per solute were calculated. We derive three rules for designing solid-solution strengthened alloys: (i) the solubility enthalpy per solute is related to the volumetric mismatch by a power law; (ii) for each annealing temperature, there exists an optimal solute¨Cvolume mismatch to achieve maximum strength; and (iii) the strengthening potential of high volumetric mismatch solutes is severely limited by their low solubility. Our results thus show that the thermodynamic properties of the system (here Al¨CX alloys) set clear upper bounds to the achievable strengthening effects owing to the reduced solubility with increasing volume mismatch.
%U http://dx.doi.org/10.1088/1468-6996/14/2/025001