Deformation, decomposition and hardening behavior of nano Al7075 alloy prepared by mechanical milling and hot pressing

• Al–Zn–Mg–Cu alloy with different crystallite sizes is produced by mechanical milling.
• High temperature consolidation results in minor grain coarsening.
• Crystallite size and lattice parameter were determined by XRD line profile analysis.
• Microhardness of the alloy shows break down of Hall–Petch relationship.

Al–Zn–Mg–Cu alloy with different crystallite size is prepared by mechanical milling and high temperature consolidation. X-ray line profile analysis and HRTEM image show high temperature consolidation results in insignificant grain coarsening. Microhardness of the alloy as a function of crystallite size shows break down of Hall–Petch relationship.

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