Abstract: Mg and its alloys show great advantages in lightweight, energy saving and emission reduction for their low density and high specific strength, and attract increasing attention in automobile, electronics, aerospace and other fields. However, the problems such as low strength, poor deformability, high chemical activity and poor corrosion resistance still limit the widespread applications of Mg and its alloys. Thus, the development of Mg alloys with high-performance is still the focus of recent studies. Various methods have been explored to improve the mechanical properties and deformability of Mg alloys, such as alloying, heat treatment and development of new Mg-based composites, but few researches are focused on the relationship between the solidification characteristics and the properties of Mg alloys. Exploration into the solidification characteristic and control of solidification path not only have scientific significance but also can provide a theoretical basis for alloy design and fabrication. Both are beneficial to the extensive application of Mg alloys. Designed microstructure can be obtained by directional solidification technology through adjusting the solidification parameters, which makes it convenient to obtain the relationships among composition, microstructure, processing parameter and performance. In recent years, lots of experimental and theoretical studies have been carried out and shed light on the knowledge of microstructural evolution, growth orientation and mechanical properties of directionally solidified Mg alloys. In this work, the development of directionally solidified Mg alloys, including the newest research progress and the existing problems are summarized, and their potential application is prospected.
1 Mordike B L, Ebert T. Materials Science & Engineering A, 2001, 302,37. 2 Mao L, Shen L, Chen J H, et al.Scientific Reports, 2017, 7 (1),1. 3 Zheng Y F, Gu X N, Witte F.Materials Science & Engineering R, 2014, 77,1. 4 Hu H Q. Principle of metal solidification (2nd edition), China Machine Press, China, 2000, pp.52 (in Chinese). 胡汉起. 金属凝固原理(第2版), 机械工业出版社, 2000, pp. 52. 5 Peng D L, Xing D W, An G Y. Journal of Harbin Institute of Technology, 1999, 31 (1),10 (in Chinese). 彭德林,邢大伟,安阁英.哈尔滨工业大学学报, 1999, 31 (1),10. 6 Chen X X, Li Q S, Fan Y Y. China Foundry Machinery & Technology, 2009(2),19 (in Chinese). 陈孝先,李秋书,范艳艳.中国铸造装备与技术, 2009(2),19. 7 Zhao Y M, Li Q S, Mo L J, et al. China Foundry Machinery & Technology, 2010 (4),12(in Chinese). 赵彦民,李秋书,莫漓江,等.中国铸造装备与技术, 2010 (4),12. 8 Zhao Y M, Zhang J Q, Xiang W, et al. Hot Working Technology, 2012, 41 (13),75 (in Chinese). 赵彦民,张家奇,向伟,等.热加工工艺, 2012, 41 (13),75. 9 Tang S Q, Zhou J X, Tian C W, et al. Shandong Science, 2011, 24 (4),18 (in Chinese). 唐守秋,周吉学,田长文,等.山东科技, 2011, 24 (4),18. 10 Mirković D, Schmid-Fetzer R.Metallurgical and Materials Transactions A, 2009, 40 (4),958. 11 Mirković D, Schmid-Fetzer R. Metallurgical and Materials Transactions A, 2009, 40 (4),974. 12 Paliwal M, Jung I H. Acta Materialia, 2013, 61 (13),4848. 13 Zhang C, Ma D, Wu K S, et al.Intermetallics, 2007, 15 (10),1395. 14 Zheng X, Luo A A, Zhang C, et al. Metallurgical and Materials Transactions A, 2012, 43 (9),3239. 15 Wang J A, Wang J H, Song Z X. Rare Metal Materials and Engineering, 2017, 46 (1),0012. 16 Luo S, Yang G, Liu S, et al. Materials Science & Engineering A, 2016, 662,241. 17 Yang G Y, Luo S F, Liu S J, et al. Journal of Alloys and Compounds, 2017, 725,145. 18 Hu Y K, Li Q S, Guo H L, et al. Journal of Taiyuan University of Science and Technology, 2018, 39 (1),48 (in Chinese). 胡延昆,李秋书,郭会玲,等. 太原科技大学学报, 2018, 39 (1),48. 19 Yang C B, Luo N, Zhang X L, et al. Rare Metal Materials and Enginee-ring, 2017, 46 (10),3028(in Chinese). 杨初斌,罗宁,张小联,等. 稀有金属材料与工程, 2017, 46 (10),3028. 20 Liu S J. Researches on the solidification characteristic and mechanical properties of Mg-Zn-Gd based magnesium alloy. Ph.D. Thesis, Northwes-tern Polytechnical University, China, 2016 (in Chinese). 刘少军. Mg-Zn-Gd系镁合金的凝固特性及其力学性能研究. 博士学位论文, 西北工业大学, 2016. 21 Zhu J J, Liu L G. Chinese Journal of Vacuum Science and Technology, 2019, 39 (7),594 (in Chinese). 朱镜瑾,刘灵歌. 真空科学与技术学报, 2019, 39 (7),594. 22 Jia H M, Feng X H, Yang Y S. Materials Science Forum, 2015, 816 ,411. 23 Jia H M, Feng X H, Yang Y S. Journal of Materials Science & Technology, 2018, 7,229. 24 Jia H M, Feng X H, Yang Y S. Acta Metallugical Sinica (English Letters), 2017, 30 (12), 1185. 25 Katgerman L. Materials Today, 2011, 14 (10),502. 26 Pettersen K, Lohne O, Ryum N. Metallurgical Transactions A, 1990, 21 (1),221. 27 Pettersen K, Ryum N. Metallurgical Transactions A, 1989, 20 (5),847. 28 Shuai S S, Guo E Y, Wang M Y, et al. Metallurgical and Materials Transactions A, 2016, 47 (9),4368. 29 Wang M Y, Williams J J, Jiang L,et al. Scripta Materialia, 2011, 65 (10),855. 30 Wang M Y, Xu Y J, Jing T, et al. Scripta Materialia, 2012, 67,629. 31 Yang Y, Yang G Y, Luo S F, et al. Acta Metallurgica Sinica, 2019, 55 (2),34 (in Chinese). 杨燕, 杨光昱, 罗时峰, 等. 金属学报, 2019, 55 (2),34. 32 Hu Y K, Li Q S, Li J W, et al. Heavy Casting and Forging, 2017 (6),6(in Chinese). 胡延昆, 李秋书, 李建文, 等. 大型铸锻件, 2017 (6),6. 33 Mabuchi M, Kobata M, Chino Y, et al. Materials Transactions, 2003, 44 (4),436. 34 Wang J H, Yuan G Y, Liu S J, et al. Transactions of Nonferrous Metals Society of China, 2016, 26 (5),1294. 35 Tane M, Nagai Y, Kimizuka H, et al. Acta Materialia, 2013, 61,6338. 36 Xie H B, Lin X P, Yin C, et al. The Chinese Journal of Nonferrous Metals, 2017, 27 (9),1862 (in Chinese). 谢宏斌,林小娉,印策,等. 中国有色金属学报, 2017, 27 (9),1862. 37 Zhang X L, Li L. Hot Working Technology, 2016, 45 (3),77 (in Chinese). 张晓林,李凛. 热加工工艺, 2016, 45 (3),77. 38 Zou M Q, Huang C Q, Xia W J, et al. Casting, 2006, 55 (9),890 (in Chinese). 邹敏强,黄长清,夏伟军,等.铸造, 2006, 55 (9),890. 39 Xiao L. Hot Working Technology, 2017, 46(15),112 (in Chinese). 肖璐.热加工工艺, 2017, 46(15),112. 40 Lin X P, Zhao T B, Dong Y, et al. Materials Science & Engineering A, 2017, 700,681. 41 Sun H, Lin X P, Zhou B, et al. Acta Metallurgica Sinica, 2020, 56 (3),340(in Chinese). 孙衡, 林小娉, 周兵, 等. 金属学报, 2020, 56 (3),340. 42 Xiao L, Pan F S. Journal of Materials Science and Engineering, 2020, 38 (1),98 (in Chinese). 肖璐, 潘复生. 材料科学与工程学报, 2020, 38 (1),98. 43 Muto Y, Shiraiwa T, Enoki M. Materials Science & Engineering A, 2017, 689,157. 44 Jia H M, Feng X H, Yang Y S. Corrosion Science, 2017, 120,75. 45 Jia H M, Feng X H, Yang Y S. Materials Science & Engineering C, 2019, 106, 110013. 46 Yang H. Mechanical property and twinning behavior of Mg and Mg-Sn alloy single crystal in directional solidification. Master's Thesis,Chongqing University, China, 2016 (in Chinese). 杨鸿. 定向凝固下镁及镁锡合金单晶的力学性能和孪生行为研究. 硕士学位论文, 重庆大学, 2016. 47 Jia H M, Feng X H, Yang Y S. Materials Science & Engineering A, 2019, 762, 138104. 48 Hu Y K, Li Q S, Li J W, et al. Heavy Casting and Forging, 2017, 3 (12),41 (in Chinese). 胡延昆,李秋书,李建文,等. 大型铸锻件, 2017, 3 (12),41. 49 Xu Z C, Feng Z X, Shi Q N, et al. Materials Reports B: Research Papers, 2018, 32 (6),865 (in Chinese). 徐志超,冯中学,史庆南,等. 材料导报:研究篇, 2018, 32 (6),865. 50 Ma Y X, Li Q S, Wang J H, et al. Foundary Technology, 2018, 39 (3),558(in Chinese). 马雁翔,李秋书,王金红,等. 铸造技术, 2018, 39 (3),558. 51 Agarwal S, Curtin J, Duffy B, et al. Materials Science & Engineering C, 2016, 68,948. 52 Hyung-Seop H, Sergio L, Indong J, et al. Material Today, 2019, 23,57. 53 Zhou J, Feng Z Y, Zhang J L, et al. Journal of Chinese Soceity for Corrosion and Protection, 2014, 34 (2),185 (in Chinese). 周京,冯芝勇,张金玲,等.中国腐蚀与防护学报, 2014, 34 (2), 185. 54 Kaviani M, Ebrahimi G R, Ezatpour H R. Materials Chemistry and Physics, 2019, 234, 245. 55 Yan J F, Heckman N M, Velasco L, et al. Scientific Reports, 2016, 6, 26870.