Al-Zn-Mg alloys are known for their high strength-to-weight ratio. This study focuses on the changes in mechanical and microstructural properties in an alloy with a low Zn/Mg ratio. Micro Vickers hardness results showed that the alloy reached peak hardness during optimal aging, then gradually softened, which is typical of over-aging. TEM analysis focusing on the 110Al revealed precipitates such as η, η', T, and T' phases that evolved as aging progressed. Initially, the precipitates couldn’t be observed, and by peak aging, the coexisting of η, η', T, and T' phases became dominant, playing a major role in the hardness. As the aging continued, the precipitates grew, while the number density decreased. This study offers insight into how precipitate phases affect the strength and properties of Al-Zn-Mg alloys when exposed to high temperatures.
Yagi et al. (Tue,) studied this question.
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