Effect of Aging Process on Microstructure Evolution and Mechanical Properties of UFG Zn-22Al Alloy

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Azad Bahram; Eivani Ali Reza; Salehi Mohammad Taghi

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Journal Paper

Paper Information

Journal: Iranian Journal of Materials Science and Engineering Year:2023 | Volume:20 | Issue:4 Page(s): 1-14

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Information Journal Paper

Title

Effect of Aging Process on Microstructure Evolution and Mechanical Properties of UFG Zn-22Al Alloy

Author(s)

Azad Bahram | Eivani Ali Reza | Salehi Mohammad Taghi | Issue Writer Certificate

Keywords

Zn-22Al alloy

ECAP

Natural aging

Artificial aging

Superplasticity

Abstract

Microstructure evolution and mechanical properties of Zn-22Al alloy after post-ECAP natural/Artificial aging were investigated. A homogenization treatment was applied to the casting samples. In addition, after preparing the samples for the ECAP, secondary homogenization treatment was done and then the samples quenched in the water to form a fine grain structure. After 8 passes of ECAP, some ECAPed samples were naturally aged and some ECAPed samples were artificially aged. Natural aging after 8 passes of ECAP showed that Zn-22Al alloy has a quasi-stable microstructure because limited grain growth occurred. Two-phase structure of Zn-22Al alloy prevented excessive grain growth after Natural aging. On the other hand, Artificial aging after 8 passes of ECAP caused a relatively much grain growth took place. In shorter times of Artificial aging, the grain growth rate is faster due to the high surface energy of grain boundaries. On the contrary, as the time of Artificial aging increased, the surface energy of grain boundaries decreased, which leads to a decrease in the grain growth rate. In addition, texture evolution was studied after aging artificial. Therefore, the main texture of α and η phases was determined.

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