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This research aims to explore how different Zn/Mg ratios influence the microstructure and mechanical properties of Al–Zn–Mg alloys during aging.

August 13, 2026MetalsOpen Access

Effect of Zn/Mg Ratio on the Microstructure and Coarsening Resistance of Al–Zn–Mg Alloys Aged at 150 °C

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Randomized trial investigates microstructure and hardness in aluminum alloys at varied Zn/Mg ratios, indicating optimal performance at a 2.4 ratio.

This research aims to explore how different Zn/Mg ratios influence the microstructure and mechanical properties of Al–Zn–Mg alloys during aging.
Designed three alloy compositions with Zn/Mg ratios of 1.6, 2.4, and 3.9, fixed combined Zn and Mg at 6.0 wt%
Conducted microhardness testing and analyzed the microstructure using SEM and TEM at 150 °C aging
Measured peak hardness and coarsening rate constant to assess performance
Maximum peak hardness of 137 HV was achieved at a Zn/Mg ratio of 2.4, with the smallest hardness loss of ΔH = 19 HV after 192 h
The lowest coarsening rate constant recorded was Kr = 0.43 at 192 h for the Zn/Mg = 2.4 alloy
Optimal Zn/Mg ratio minimized the precipitate-free zone width while maintaining grain boundary precipitate distribution

A 2026 study studied this question.

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Randomized trial investigates microstructure and hardness in aluminum alloys at varied Zn/Mg ratios, indicating optimal performance at a 2.4 ratio.