Abstract
The composition dependence of the elastic moduli B, C and C' of FCC transition metal alloys is analysed by separating it into a contribution from the change in the atomic volume and an intrinsic contribution of the electron concentration X. When the volume contribution is taken into account, there are not great differences in the X dependence of B and C in different alloy systems. Differences in the intrinsic X dependence of C' in different alloys with X in the neighbourhood of 8.8. B is relatively insensitive to changes in X except in the regions X<7.7 and 8.6<X<8.9 where it decreases with decreasing X. The temperature dependence of all the moduli is also anomalous in these regions of X.
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