Xu Yongtao, Zhang Zhifeng, Gao Zhihua, Bai Yuelong, Zhao Purui, Mao Weimin
National Engineering & Technology Research Center for Non-Ferrous Metals Composites, GRINM Group Corporation Limited, Beijing 101407, China.
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100088, China.
Materials (Basel). 2021 Nov 15;14(22):6881. doi: 10.3390/ma14226881.
In this paper, the effect of adding the refiner Sc to the high Zn/Mg ratio 7xxx series aluminum alloy melt on the hot tearing performance, microstructure, and mechanical properties of the alloy is studied. The hot tearing performance test (CRC) method is used to evaluate the hot tearing performance of the alloy. The squeeze casting process was used to form solid cylindrical parts to analyze the structure and properties of the alloy. This study shows that the hot cracking sensitivity of the alloy after the addition of the refiner Sc is significantly reduced. The ingot grain size is significantly reduced, and the average grain size is reduced from about 86 μm to about 53 μm. While the mechanical properties are significantly improved, and the tensile strength reduced from 552 MPa is increased to 571 MPa, and the elongation rate is increased from 11% to 14%.
本文研究了向高锌/镁比7xxx系铝合金熔体中添加细化剂钪（Sc）对合金热裂性能、微观组织和力学性能的影响。采用热裂性能试验（CRC）方法评估合金的热裂性能。利用挤压铸造工艺制备实心圆柱零件，以分析合金的组织和性能。研究表明，添加细化剂钪后合金的热裂敏感性显著降低。铸锭晶粒尺寸显著减小，平均晶粒尺寸从约86μm减小至约53μm。同时力学性能显著提高，抗拉强度从552MPa提高到571MPa，伸长率从11%提高到14%。
