Effect of Deformation Heat Treatment on Microstructure and Properties of Mg-4Al-1Si-1Gd Alloy
ZHU Yiyao1,2, FENG Junqiang3, ZHANG Zengyao1, YANG Zhening1, ZHANG Xiangpeng1, WANG Hongxia1
1 College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China 2 School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China 3 Shanxi Jiangyang Chemical Co.,Ltd., Taiyuan 030041, China
Abstract: In order to improve the low performance of AS series wrought magnesium alloy due to the coarse and uneven distribution of the second phase, the extruded Mg-4Al-1Si-1Gd alloys were treated by isothermal aging at 200 °C for 5 h, 10 h and 15 h respectively and equal channel angular pressing (ECAP), the microstructure and tensile properties were analyzed by optical microscope, scanning microscope and tensile test. The results show that with the extension of the isothermal aging time, the grain size increases, and a small amount of large-scale Mg17Al12 phase is precipitated at the grain boundaries. After aging for 10 h, the tensile properties of the alloy at room temperature were better, but the strength and plasticity of the alloy were obviously lower than that of extruded state. The thermal deformation energy and strain accumulation provided by deformable aging promote the full progress of dynamic recrystallization. The grain size was reduced from 10.68 μm in the extruded state to 2.20 μm. The Mg2Si and Si3Gd5 phases were fragmented completely and distributed more uniformly, a large number of granular Mg17Al12 phases were precipitated at the grain boundary, the basic plane texture was weakened obviously, and a new non-basic plane texture component was formed. The tensile strength, yield strength and elongation of Mg17Al12 were increased by 11.7%, 33.7% and 19.9%, respectively. The contribution of fine grain strengthening to yield strength was 42.8 MPa, and that of Orowan strengthening was 4.25 MPa.
1 Xu Y, Gensch F, Ren Z, et al. Progress in Natural Science: Materials International,2018,28(6),724. 2 Lu S Z, Hellawell A. Metallurgical Transactions A,1987,18(10),1721. 3 Liu W Y, Xu C, Liu M W, et al. Journal of Materials Engineering,2019,47(6),129(in Chinese). 刘文祎,徐聪,刘茂文,等.材料工程,2019,47(6),129. 4 Wang K Y, Wu X F, Gao X Y, et al. Special Casting & Nonferrous Alloys,2018,38(11),1244(in Chinese). 王克研,武晓峰,高欣宇,等.特种铸造及有色合金,2018,38(11),1244. 5 Wang W X, Zhang S, Liu J, et al. Special Casting & Nonferrous Alloys,2014,34(4),346(in Chinese). 王武孝,张莎,刘健,等.特种铸造及有色合金,2014,34(4),346. 6 Bai S M, Yao J P, Liao L L. Special Casting & Nonferrous Alloys,2016,36(12),1337(in Chinese). 柏世梅,尧军平,廖露亮.特种铸造及有色合金,2016,36(12),1337. 7 Zhang Z M, Ma Y, Jia S Z, et al. Materials for Mechanical Engineering,2011,35(3),28(in Chinese). 张忠明,马莹,贾树卓,等.机械工程材料,2011,35(3),28. 8 Wang J W. Study on composition design microstructure and properties of Mg-Al-Si-Sr heat-resistant magnesium alloy.Master’s Thesis, Shandong Jianzhu University,China,2015(in Chinese). 王金伟.Mg-Al-Si-Sr耐热镁合金成分设计与组织性能研究.硕士学位论文,山东建筑大学,2015. 9 Zheng R J. The structure and property of Mg-Al-Si alloy with reciprocation extrusion and modification. Master’s Thesis, Xi’an University of Techno-logy, China,2007(in Chinese). 郑荣军.Mg-Al-Si合金往复挤压及变质处理的组织与性能.硕士学位论文,西安理工大学,2007. 10 Homma T, Kunito N, Kamado S. Scripta Materialia.2009,61(6),644. 11 Lu L L, Yang P, Wang F Q, et al. The Chinese Journal of Nonferrous Metal,2006(6),1034(in Chinese). 路林林,杨平,王发奇,等.中国有色金属学报,2006(6),1034. 12 Huang Q Y. Theoretical and experimental investigations on grain refinement of Mg-Al alloys. Ph.D. Thesis, Chongqing University, China,2016(in Chinese). 黄秋燕.Mg-Al合金铸态晶粒细化理论和实验研究.博士学位论文,重庆大学,2016. 13 Chen B, Lin D L, Zeng X Q, et al. The Chinese Journal of Nonferrous Metal,2010,20(4),613(in Chinese). 陈彬,林栋樑,曾小勤,等.中国有色金属学报,2010,20(4),613. 14 Zhao T T. Effect of deformation and ageing process on the microstructure and properties of a 7N01 alloy. Master’s Thesis, Hunan University, China,2016(in Chinese). 赵甜甜.形变时效组合工艺对7N01铝合金力学性能及微观结构的影响.硕士学位论文,湖南大学,2016. 15 Gong J L. Study on microstructures and properties of Mg12Al-0.7Si alloys modified by Sr and Sb after equal channel angular pressing. Master’s Thesis, Taiyuan University of Technology, China,2012(in Chinese). 龚家林.ECAP挤压对Sr、Sb变质处理Mg12Al-0.7Si合金组织与性能的影响.硕士学位论文,太原理工大学,2012. 16 Xiang J, Han Y F, Le J W, et al.Rare Metal Materials and Engineering,2020,49(3),901(in Chinese). 项娟,韩远飞,乐建温,等.稀有金属材料与工程,2020,49(3),901. 17 Wang H X, Zhou K K, Liang W, et al. The Chinese Journal of Nonferrous Metals,2011,21(8),1794(in Chinese). 王红霞,周康康,梁伟,等.中国有色金属学报,2011,21(8),1794. 18 Zhang H, Wang T L, Liu W Y, et al. Journal of Plasticity Engineering,2017,24(1),36(in Chinese). 张会,王同乐,刘文义,等.塑性工程学报,2017,24(1),36. 19 Yu K, Li W X, Wang R C, et al. Rare Metal Materials and Engineering,2006(11),1748(in Chinese). 余琨,黎文献,王日初,等.稀有金属材料与工程,2006(11),1748. 20 Yang Z, Li J P, Gu Y C, et al. Materials Science and Engineering: A,2007,454-455,274. 21 Wang Q S. The study of electronic mechanism of Al-Mg-Si alloy. Master’s Thesis, Guangxi University,China,2006(in Chinese). 王庆松.Al-Mg-Si合金强化机理的电子理论研究.硕士学位论文,广西大学,2006. 22 Cheng W L, Tian Q W, Yu H, et al. Journal of Magnesium and Alloys,2014,2(4),299.
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2021, Vol. 35 
