IJM015 Influence of Zirconium Content on Mechanical Strength and Hardness of AlCuNiZr Alloys Fabricated by Shockwave-Assisted Technique

Abstract

This report presents a comprehensive analysis of the mechanical properties of AlCuNiZr alloys fabricated using a shockwave-assisted technique, with a particular focus on the influence of varying Zr content. The study demonstrates that this non-equilibrium processing route produces ultrafine grain structures, high dislocation densities, and strong interfacial bonding. Zirconium is shown to synergistically enhance these effects by promoting further grain refinement and precipitation strengthening through the formation of Al₃Zr and Ni₇Zr₂ intermetallic compounds. The results indicate that the mechanical strength of the alloy exhibits a non-linear relationship with zirconium content, peaking at 0.5 wt.% due to the optimal balance of grain refinement and precipitation strengthening. Exceeding this concentration can lead to a decrease in strength, likely from precipitate coarsening. The findings underscore the potential of combining shockwave processing with precise compositional control to design advanced AlCuNiZr alloys with superior mechanical performance for demanding applications in aerospace and automotive sectors.