Effect of Low Temperature Pre-ageing on Microstructure and Corrosion Resistance of Al-4.5Zn-1.4Mg Alloy
WANG Shuai1,4, LUO Binghui2,*, XING Shasha3, YUAN Guanghui4, XIE Ning4, JIANG Gen5
1 School of Chemistry and Environment, Ankang University, Ankang 725000, Shaanxi, China 2 School of Material Science and Engineering, Central South University, Changsha 410083, China 3 Medical College of Ankang University, Ankang 725000, Shaanxi, China 4 Innovation Research Institute of Advanced Energy Storage Materials and Battery Technology for Future Industrialization, Ankang University, Ankang 725000, Shaanxi, China 5 Zoomlion Heavy Industry Science and Technology Development Co., Ltd., Changsha 410083, China
Abstract: In this work, a new three-stage ageing treatment known as P-T74 for aluminum alloy was designed, that is, a low temperature pre-ageing treatment at 65 ℃/96 h was added before the T74 treatment. The corrosion properties and microstructure evolution of Al-4.5Zn-1.4Mg alloy during P-T74 and T74 ageing treatment were studied by using of optical microscope, transmission electron microscope and three-dimensional atom probe. The results show that in comparison with T74, P-T74 can effectively increase the density of Guinier Preston zones (GP zones) in the early stage, giving rise to more nucleation sites for the subsequent η′ phase and η phase. In comparison with T74 treatment, with P-T74 ageing treatment, the η phase in the grain boundaries exhibits a higher area fraction, a higher degree of intermittent distribution, a higher Cu content and a narrower precipitation free zone (PFZ). As a results, the rate of galvanic corrosion reaction decreases, the corrosive ions indepen-dently or stress synchronously are difficult to expand into the grain boundaries and the corrosion resistance of the alloy increases.
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2025, Vol. 39 
