Effects of Annealing Treatment on Microstructures and Mechanical Properties of Extruded Mg-8Li-3Al-2Zn Plates
CHEN Lisong1,2,3, LIU Jinxue3,4, XIE Haitao1,3, LIU Zhipeng1,4, SONG Xinyu1,3, XIAO Yang1,2,3,4,*, GUAN Shaokang1,2, HE Jilin1,2
1 School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China 2 Zhongyuan Critical Metals Laboratory, Zhengzhou 450001, China 3 Zhengzhou Light Alloy Institute Co.,Ltd., Zhengzhou 450041, China 4 Henan Aerospace New Materials Research Institute Co.,Ltd., Zhengzhou 450100, China
Abstract: The microstructure and mechanical properties of as-extruded Mg-8Li-3Al-2Zn (LAZ832) alloy after annealing within the temperature range of 300—420 ℃ for 15 minutes were investigated by means of optical microscope (OM), X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). The results show that the α-Mg and β-Li phases of the Mg-Li alloy undergo dynamic recrystallization after extrusion, and a large amount of metastable phase MgLi2Al is dispersed. The secondary MgLi2Al phase disappeared after the extruded sheets were annealed at 300 ℃; after annealing at 340 ℃, the primary AlLi phase began to dissolve; after annealing at 380 ℃, the MgLi2Al and AlLi phases were basically redissolved, and at the same time, the alloy underwent static recrystallization with grain growth, and the texture type of α-Mg phase changed from {1120}〈0001〉 prismatic texture to {1120}〈0001〉 and {1120}〈1010〉 prismatic texture; further increasing the annealing temperature to 420 ℃, grain growth was obvious. The strength of the alloy increases and then decreases with increasing annealing temperature due to the combined effect of solid solution strengthening and recrystallization softening, as compared to the extruded alloy. The alloy achieves optimum performance after annealing at 380 ℃, with improved strength and plasticity. The yield strength increases by 18.8%, the tensile strength increases by 13.8%, and the elongation increases by 7.5%.
1 Zhang M L. Magnesium-lithium ultralight alloy, Science Press, China, 2010, pp. 5 (in Chinese). 张密林. 镁锂超轻合金, 科学出版社, 2010, pp. 5. 2 Wang J W, Liu X H, Wang F C, et al. Dual Use Technologies & Products, 2013(6), 21 (in Chinese). 王军武, 刘旭贺, 王飞超, 等. 军民两用技术与产品, 2013(6), 21. 3 Song W J, Dong H P, Liu J, et al. The Chinese Journal of Nonferrous Metals, 2021, 31(1), 1(in Chinese). 宋文杰, 董会萍, 刘洁, 等. 中国有色金属学报, 2021, 31(1), 1. 4 Li X Q, Ren L, Le Q C, et al. Journal of Magnesium and Alloys, 2021, 9(3), 937. 5 Liu Z, Nie J F, Zhao Y H. Transactions of Nonferrous Metals Society of China, 2024, 34(1), 1. 6 Liang X L, Peng X, Ji H, et al. Transactions of Nonferrous Metals Society of China, 2021, 31(4), 925. 7 Tang Y, Jia W T, Liu X, et al. Materials Science and Engineering A, 2016, 675, 55. 8 Ji H, Peng X, Zhang X L, et al. Journal of Alloys and Compounds, 2019, 791, 655. 9 Tang S, Xin T Z, Xu W Q, et al. Nature Communications, 2019, 10(1), 1003. 10 Liu Q Y, Zhou L, Rong X Y, et al. Materials Reports, 2022, 36(10), 150 (in Chinese). 刘沁钰, 周利, 戎校宇, 等. 材料导报, 2022, 36(10), 150. 11 Cai X, Qiao Y X, Xu D K, et al. Materials Reports, 2019, 33(S2), 374 (in Chinese). 蔡祥, 乔岩欣, 许道奎, 等. 材料导报, 2019, 33(S2), 374. 12 Ji D W, Bai M H, Xiao Y, et al. Hot Working Technology, 2020, 49(10), 139 (in Chinese) 纪大伟, 白明华, 肖阳, 等. 热加工工艺, 2020, 49(10), 139. 13 Chen Z H. Deformable magnesium alloy, Chemical Industry Press, Chian, 2005, pp. 353 (in Chinese). 陈振华. 变形镁合金, 化学工业出版社, 2005, pp. 353. 14 Sun Y H, Zhang F, Wang R H, et al. Journal of Alloys and Compounds, 2023, 964, 171. 15 Cao F R, Xia F, Hou H L, et al. Materials Science & Engineering A, 2015, 637(18), 89. 16 An S, Shang D L, Chen M, et al. Materials, 2022, 15(14), 5026. 17 Kumar V, Govind, Shekhar R, et al. Materials Science & Engineering A, 2012, 547, 38. 18 Humphreys F J, Hatherly M. Recrystallization and related annealing phenomena, Elsevier, Netherlands, 2012, pp. 363. 19 Tome C N, Yoo M H, Agnew S R. Acta Materialia, 2001, 49(20), 4277. 20 Steiner M A, Bhattacharyya J J, Agnew S R. Acta Materialia, 2015, 95(0), 443. 21 Perez-Prado M, Ruano O. Scripta Materialia, 2003, 48(1), 59. 22 Chen Z H, Xia W J, Cheng Y Q, et al. The Chinses Journal of Nonferrous Metals, 2005(1), 1(in Chinese). 陈振华, 夏伟军, 程永奇, 等. 中国有色金属学报, 2005(1), 1. 23 Meng L, Liu Z, Chen L. Transactions of Materials and Heat Treatment, 2015, 36(5), 144(in Chinese). 孟利, 刘璋, 陈冷. 材料热处理学报, 2015, 36(5), 144.
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2025, Vol. 39 
