Effects of non-isothermal aging on mechanical properties, corrosion behavior and microstructures of Al-Cu-Mg-Si alloy

被引：0
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作者：
Zhan, Xin [1 ]
Tang, Jianguo [1 ]
Li, Huizhong [1 ,2 ,3 ]
Liang, Xiaopeng [1 ,2 ,3 ]
Lu, Yunfei [4 ]
Che, Yixuan [1 ]
Tu, Wenbin [1 ]
Zhang, Yidan [1 ]
机构：
[1] School of Materials Science and Engineering, Central South University, Changsha,410083, China
[2] State Key Laboratory of Powder Metallurgy, Central South University, Changsha,410083, China
[3] Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha,410083, China
[4] School of Minerals Processing and Bioengineering, Central South University, Changsha,410083, China
来源：
Journal of Alloys and Compounds | 2020年 / 819卷
基金：
中国国家自然科学基金;
关键词：
Effects of non-isothermal aging (NIA) treatments on the mechanical properties; intergranular corrosion (IGC) and microstructures of Al-Cu-Mg-Si alloy were investigated by tensile test; intergranular corrosion test; electrochemical analysis; optical microscopy and transmission electron microscopy. Compared with isothermal peak-aging (T6) treatment; the NIA treatments effectively improve the intergranular corrosion resistance by narrowing precipitation free zones (PFZ) and breaking the continuous distribution of precipitates on the grain boundaries. Under NIA treatments; with the increase of heating rate; the width of PFZ decreases induces the improvement of intergranular corrosion resistance. The mechanical properties of NIA treatment could be enhanced by adjusting the heating rate. The tensile strength and yield strength after NIA treatment with a heating rate of 20 °C/h are increased 1.5% and 5.8% than that after T6 treatment; respectively; which is ascribed to finer intra-grain precipitates. Reasonably; the mechanical properties and intergranular corrosion resistance could be improved simultaneously by adjusting the heating rate of NIA treatments. © 2019 Elsevier B.V;
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