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Subject classification: 62.20.Dc; S7.14 We have investigated the mechanical properties and elastic constants of zinc-blende Ga 1--x In x N alloys, using the pseudopotential method within the virtual crystal approximation combined with the Harrison bond-orbital model. The agreement between our results and the available experimental and other theoretical data was generally satisfactory. Special attention has been given to the effect of alloy disorder on the studied quantities. For this purpose, the compositional disorder is added to the virtual crystal approximation as an effective potential. It is found that except for the anisotropy factor, the compositional disorder should not be ignored in the calculations of the remaining studied quantities of alloys of interest.

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