Effect of Aging Time on Precipitation of MgZn2 and Microstructure and Properties of 7075 Aluminum Alloy
Source abstract
Abstract
The influence of the solid solution and single-stage aging treatment of 7075 aluminum alloy on microstructure and property has been investigated. The results showed that the microstructure of the raw rolling state, solid solution state and aging state are all obvious strip structures. The fine second phase resolves into the α-Al matrix in the solid solution treatment process, and the higher temperature of the solid solution, the less the fine precipitation phase in the α-Al matrix. Many fine second phases precipitate in the α-Al matrix and grain boundary after aging treatment and distribute uniformly along the rolling direction. The 7075 aluminum alloy can achieve the best aging effect, after solid solution treatment at 500 °C for 1.5 h, then aging treatment at 100 °C for 24 h, and the hardness reaches peak value of 160.24 HV. A part of the soluble and coarse second phase redissolved into the α-Al matrix after solid solution treatment. The precipitation of MgZn2 phase is complete in peak-aged state. The MgZn2 phase evenly distributes in the α-Al matrix, and it also precipitates at grain boundary. The relationship between the area fraction of the MgZn2 phase and the time during the aging process follows the JMA equation. According to the statistical data, the equations of precipitation kinetics of 7075 aluminum alloy under different aging treatment were finally established.
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Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties · Microstructure and mechanical properties
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References (41)
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