Elastic stiffnesses of copper‐tin and copper‐aluminum alloy single crystals

摘要

The elastic stiffnesses of a series of CuSn and CuAl alloys have been measured. Both C=c44 and C=(1/2)(c11-c12) decrease as Sn concentration increases. However for the CuAl alloys, C increases while C′ decreases. The results have been compared to those predicted by the theory of Fuchs. For the CuAl alloy the agreement is fair, while for the CuSn alloy it is poor. Curvature in the plots of C and C′ vs composition is found mostly to be a consequence of the lattice parameter effect on the elastic stiffnesses. The effect due to alloying alone deviates only slightly from linearity for solute concentrations less than 8 at.%.