The influence of growth rate on the microstructure and properties of directionally solidified Zn-11Al-3Mg-0.2Si alloy

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作者：
Li, Jipeng [1 ,2 ]
Peng, Peng [3 ]
Yan, Xiantao [3 ]
Wang, Jin [2 ]
Cheng, Shusen [1 ]
机构：
[1] University of Science and Technology Beijing, Beijing,100083, China
[2] Gansu Jiu Steel Group Hongxing Iron and Steel Co.,Ltd, Jiayuguan,735100, China
[3] School of Materials and Energy, Lanzhou University, Lanzhou,730000, China
来源：
Journal of Alloys and Compounds | 2024年 / 1004卷
关键词：
Zn-11Al-3Mg-0.2Si alloy was prepared via directional solidication with growth rates ranging from 1 to 200 μm/s. The growth rate dependence of the microstructure; corrosion resistance and microhardness of the alloy were investigated in detail. The results show that the microstructure of the alloy consists mainly of the primary Al phase and MgZn2 + Al binary eutectic at the growth rates of 1–5 μm/s. This can be attributed to the further growth of the Al and MgZn2 phases formed in the mushy zone during the heat-holding period. However; a microstructure of primary Al phase and Zn+ Al+Mg2Zn11 ternary eutectic was obtained when the growth rate is 10 μm/s and higher. The reason for the microstructural change is that the increase in undercooling caused by the growth rate at the solid-liquid interface promotes the nucleation of the Zn+Al+Mg2Zn11 ternary eutectic phase instead of MgZn2 phase. Electrochemical and weightless corrosion experiments show that the alloy obtained at the growth rate of 10 μm/s possesses the best corrosion resistance. The ternary eutectic structure facilitates the formation of dense corrosion products; while the grain refinement caused by the increase in growth rate will aggravate intergranular corrosion. The nanoindentation tests demonstrate that the microhardness of each phase increases with grain refinement; and the microhardness of MgZn2 phase is much higher than that of the ternary eutectic phase. Under the combined effects of intermetallic compound phase strengthening and grain refinement strengthing; the alloy obtained at the growth rate of 5 μm/s shows the highest microhardness. © 2024 Elsevier B.V;
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