Effects of Y on the Microstructure and Properties of 6082 Aluminum Alloy Cast-Rolled Plates
XU Ze1, XU Zhen1,2,*, LYU Zhe1, SONG Hua2, CHEN Qingqiang3
1 College of Materials and Metallurgy, Liaoning University of Science and Technology, Anshan 114051, Liaoning, China 2 Provincial Key Laboratory of Metallurgical Equipment and Process Control, Liaoning University of Science and Technology, Anshan 114051, Liaoning, China 3 School of Mechanical and Electrical Engineering, Shandong Jianzhu University, Jinan 250101, China
Abstract: This study investigated the influence of adding trace amounts of Y element on the microstructure and mechanical properties of 6082 aluminum alloy produced by dual-roll casting. Different Y contents were designed, and 6082 cast-rolled plates were prepared using a dual-roll casting machine. X-ray diffraction, metallographic observation, and scanning electron microscopy were employed to study the effect of Y on the microstructure and properties of the cast-rolled plates. The results show that Y element has a significant refining effect. The average grain sizes of the edge and center regions of the plate with a Y content of 0.35wt% reach a minimum at 30.9 μm and 25.7 μm, respectively. The mechanical properties of the plate are the best at this Y content, with tensile strength, yield strength, and elongation of 200.5 MPa, 129.9 MPa, and 14.9%, respectively. With further addition of Y, the impurity phases and rare earth compounds in the microstructure increase significantly, and the formability of the material decreases substantially. Analysis reveals that Y element segregates at grain boundaries, forming compounds such as Al3Y and Y5Si3, which can inhibit grain boundary migration and contribute to grain refinement. Additionally, Y interacts with Fe elements in the alloy, transforming the coarse eutectic phases on the grain boundaries into finer particles and improving the alloy’s ductility.
通讯作者:
* 徐振,辽宁科技大学材料与冶金学院副教授、硕士研究生导师。2003年东北大学材料成型及控制工程专业本科毕业,2012年东北大学材料加工工程专业硕士毕业,2015年博士毕业于东北大学材料加工工程专业,博士毕业后到辽宁科技大学工作至今。目前主要从事铝合金新材料强韧化体系设计、铝合金铸轧工艺等方面的研究工作。发表论文30余篇,包括Journal of Alloys and Compounds、Materials Characterization、Rare Metal Materials and Engineering等。ustlxuzhen@126.com
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2024, Vol. 38 
