Effects of (Si+Mn)/Fe on Microstructures and Mechanical Properties of As-cast Al-5Cu Alloys
HU Wenjie1,2, GUO Hongmin1,2, DENG Ben1,2, YANG Kunyi1,2, YU Cisheng1,2
1 School of Physics and Materials, Nanchang University, Nanchang 330031, China 2 Key Lab for Net Forming in Jiangxi Province, Nanchang University, Nanchang 330031, China
Abstract: The effect of mass ratio of (Si+Mn)/Fe(K=3, 4, 5 and 6) on the As-cast microstructure and mechanical properties of Al-5Cu-0.3Fe high-strength cast alloy were studied by OM, SEM, EDS and DSC. The results show that the evolution order of the Fe-rich intermetallic morphology is needle-like, Chinese script, aggregated Chinese script with the increase of K value, and the Fe-rich intermetallic in the alloy changes from needle-like Al3FeMn to Chinese-script Al6FeMn. In Al-5.0Cu-0.3Fe-1Si-xMn alloys, the mechanical properties of the alloy with K=4 are the best, and the better plastic characteristics are also shown on the fracture surface of the alloy. Compared with K=3, the ultimate tensile strength and elongation of the alloy are increased by 22% and 65%, respectively. Si and Mn have a good modification effect on the Fe-rich intermetallic of Al-5.0Cu-0.3Fe alloy. Appropriate reduction of Mn addition in Al-5Cu alloy and further increase of Si content Maintain (Si+Mn)/Fe=4, is helpful to reduce the porosity of the alloy, better regulate the morphology of Fe-rich phase and reduce the thermal cracking sensitivity of the alloy.
1 Song D F, Zhou N, Xu J, et al. Rare Metal Meterials and Engineering, 2016,45(8), 2133(in Chinese) 宋东福,周楠,徐静,等.稀有金属材料与工程,2016,45(8), 2133. 2 Lin B, Zhang W W. Transactions of Materials and Heat Treatment, 2016,37(12), 47(in Chinese) 林波, 张卫文.材料热处理学报, 2016,37(12), 47. 3 Liu K, Cao X, Chen X G. Metallurgical and Materials Transactions A, 2011, 42(7), 2004. 4 Zhang W W, Lin B, Luo Z, et al. Journal of Materials Research, 2015, 30(16), 2474. 5 Liu K, Cao X, Chen X G. Metallurgical and Materials Transactions A, 2012, 43(4), 1097. 6 Xu R, Li H Y, Lin B, et al. Foundry Technology,2018,39(9), 2008 (in Chinese). 许锐, 李浩宇, 林波,等.铸造技术, 2018,39(9), 2008 . 7 Bao Y, Zhao S M, Lv G Q, et al. The Chinese Journal of Process Engineering, 2019, 19(2), 309 (in Chinese). 鲍雨, 赵世民, 吕国强, 等.过程工程学报, 2019,19(2), 309. 8 Xu L. International Journal of Cast Metals Research, 2019, 32(2), 106. 9 Lin B, Zhang W W, Lou Z H, et al. Materials and Design, 2014, 59, 10. 10 Kamga H K, Larouche D, Bournane M, et al. Metallurgical and Materials Transactions A, 2010, 41(11),2844. 11 Liu K, Cao X, Chen X G. Metallurgical and Materials Transactions B,2012,43(5), 1231. 12 Lin B, Xu R, Li H Y, et al. Foundry Technology,2018,39(7),1397. (in Chinese) 林波, 许锐, 李浩宇,等. 铸造技术. 2018, 39(7), 1397. 13 Ma S X. Effect of modification of W on the morphology of iron-rich phase of A356 aluminum alloy. Master's Thesis, North Central University, China, 2020 (in Chinese). 马世旋. 钨对A356铝合金富铁相形貌的影响. 硕士学位论文,中北大学,2020. 14 Zhao Y L, Zhang W W, Yang C, et al. Journal of Materials Research, 2018,33(8), 898. 15 Khalil G, Reza T, Talafi N M. International Journal of Minerals Metallurgy and Materials, 2021,28(4),718. 16 Ma T F. Composition design, processability and mechanical properties of high strength casting Al-5.0Cu-XSi-0.8Mn alloy. Master's Thesis, Nanchang University, China, 2020 (in Chinese). 马腾飞. 高强铸造A1-50Cu-XSi-08Mn合金的成分设计工艺性能及力学性能. 硕士学位论文, 南昌大学, 2020. 17 Liu K, Cao X, Chen X G. Metallurgical and Materials Transactions A, 2013,44(2),682. 18 Lin B. Study on the formation characteristics and mechanical properties of iron-rich phase in squeeze casting A1-5.0Cu alloy. Ph.D. Thesis, South China University of Technology, China, 2014 (in Chinese). 林波.挤压铸造A1-5.0Cu合金中富铁相形成特点及力学性能研究. 博士学位论文, 华南理工大学,2014. 19 Hwang J Y, Doty H W, Kaufman M J. Materials Science & Engineering, A, 2008,488(1/2), 496. 20 Liu K,Cao X,Chen X G. Metallurgical and Materials Transactions A,2014, 45(5), 2498. 21 Wei X, Wang H J, Liu C W, et al. The Chinese Journal of Process Engineering, 2019, 19(1),45(in Chinese). 韦漩,王海娟,刘春伟,等. 过程工程学报,2019,19(1),45. 22 Kamgah K, Larouche D, Bournane M, et al. Metallurgical and Materials Transactions A, 2010, 41(11), 2844. 23 Lin B, Zhang W W, Niu J Y, et al. Chinese Journal of Rare Metals, 2017,41(3), 225 (in Chinese). 林波,张卫文,牛嘉运,等.稀有金属, 2017,41(3),225. 24 Ceschini L, Boromei I, Morri A, et al. Materials and Design, 2012, 36(65), 522. 25 Shi P J, Li R G, Li Y, et al. Science, 2021, 373(6557), 912. 26 Per S. Metallurgical Transactions A, 1987, 18(2), 189.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2023, Vol. 37 
