The Influence of Milling Time and Impact Force on the Mutual Diffusionof Al and Cu During Synthesis of Al-4.5wt%Cu Alloy viaMechanical Alloying

摘要

The study of mechanical alloying (MA) process on the immiscible Al—Cu systems havingpositive heats of mixing has been investigated by the earlier researchers. However, a comprehensiveunderstanding of the diffusion phenomenon during the mechanical alloying process is still far fromcomplete. The effects of milling time and impact force, defined as the ball-to-powder weight ratio(BPR), on the elemental diffusion during mechanical alloying process of A1-4.5wt%Cu wereevaluated in the current work. X-ray diffraction results showed that increasing the milling time andimpact force led to increasing the dislocation as because of increasing the micro-strain, lattice parameterand decreasing the crystallite size. As a result of this, the diffusion rate was enhanced. Theinterpretation of data resulted have been discussed in details.