Effect of structure on the Young's modulus of Al-Cu-Ni alloys

Abstract

Experimental measurements of the dynamic Young's modulus of a wide range of wrought Al-Cu-Ni alloy compositions have shown this property to depend not only on the volume fraction of the phases present in the alloy but also on the microstructure. The results can be described by the simple relationship:

$$E = 76.6 + 94.6 V{_d} - 1.3d + 0.06\lambda$$

whereE is Young's modulus of the alloy (in GN m⁻²),V _d is the volume fraction of all the dispersed phases, andd and λ are the respective average particle size and mean free path of all dispersed phases (inμm). In view of the wide range of alloys tested in the present work, the above equation is expected to apply reasonably well to most wrought aluminium alloys.