Research on the Relationship Between the Strain Rate Sensitivity Exponent, Strain Hardening Exponent and Deformation Parameters, Grain Size of Ti2AlNb Titanium Alloy
1 School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China 2 Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China
Abstract: The effects of deformation parameters and microstructure on the strain rate sensitivity m and strain hardening exponent n were analyzed in depth based on isothermal compression experiments of Ti2AlNb alloy plates at the deformation temperatures of 1 273—1 423 K and the strain rates in the range of 0.001—10 s-1. The results showed that the flow stress of Ti2AlNb alloy decreases with the increasing deformation temperature and decreasing strain rate. The maximum m value of 0.61 occurred at 1 323 K and a strain rate of 0.001 s-1 during the isothermal compression of Ti2AlNb alloy. Moreover, the m value decreased with the increase of strain rate in the deformation temperature range of 1 273—1 323 K. On the contrary, the m value increased with the increase of strain rate in the deformation temperature range of 1 373—1 423 K. Furthermore, the n value decreased firstly and then increased with the increase of strain at the strain rate of 0.001 s-1, but at the strain rate of 0.01—10 s-1, the n value increased firstly and then decreased with the increase of strain. In addition. the strain hardening exponent and strain rate sensitivity of Ti2AlNb alloy both decreased with the increase of grain size. Finally, the better processing windows of Ti2AlNb alloy sheet were given as 1 273—1 323 K/0.001—0.01 s-1 and 1 373—1 423 K/0.1—1 s-1. This has important theoretical significance and engineering value for to improve the properties of Ti2AlNb alloy sheet by optimizing the microstructure through the process.
1 Jiang H T, Zhang G H, Guo W Q, et al. Advanced Engineering Materials, 2018, 20, 1800281. 2 Wang S B, Xu W C, Zong Y Y, et al. Metals-Open Access Metallurgy Journal, 2018, 8(6), 382. 3 Zhang H Y, Zhang Y R, Liang H Y, et al. Journal of Alloys and Compounds, 2020, 846, 156458. 4 Yang J L, Wang G F, Jiao X Y, et al. Journal of Alloys and Compounds, 2017, 695, 1038. 5 Zhang Q H, Chen M H, Wang H, et al. Transactions of Nonferrous Metals Society of China, 2016, 26(3), 722. 6 Kreitcberg A, Brailovski V, Prokoshkin S, et al. Materials Science & Engineering A, 2015, 622, 21. 7 Luo J, Li M Q. Materials Science and Engineering A, 2012, 538, 156. 8 Luo J, Li M Q, Yu W X, et al. Materials & Design, 2010, 31(2), 741. 9 Yue Z W, Zhu Y C, Fan J X, et al. Material Research Express, 2019, 6(11), 1165. 10 Romhanji E, Dudukovska M, Glišić D. Journal of Materials Processing Technology, 2002, 125-126, 193 11 Antonie P, Vandeputte S, Vogt J B. Materials Science and Engineering A, 2006, 433(1), 55. 12 Semiatin S L, Seetharaman V, Weiss I. Materials Science and Engineering A, 1999, 263(2), 257. 13 Cheng L, Chang H, Tang B, et al. Journal of Alloys and Compounds, 2013, 522(1), 363. 14 Wang G, Hui S X, Ye W J, et al. Transactions of Nonferrous Metals Society of China, 2012, 22(12), 2965. 15 Lee M, Kim S, Han H N, et al. International Journal of Mechanical Sciences, 2009, 51(11), 888. 16 Otsuka M, Tsurumaki K I, Niimura M, et al. Journal of the Japan Institute of Light Metals, 1986, 36(11), 752. 17 Guo H J. Research on the deformation behavior of magnesium alloy prepared by friction stir processing. Master's Thesis, Xi'an University of Architecture and Technology, China, 2016 (in Chinese). 郭洪举. 搅拌摩擦加工镁合金变形行为的研究. 硕士学位论文, 西安建筑科技大学, 2016. 18 Hu S H. Research on microstructure and mechanical properties and grain size effect of pure copper. Master's Thesis, Nanjing University of Science and Technology, China, 2016 (in Chinese). 胡师鹤. 纯铜的微观组织与力学性能的晶粒尺寸效应研究. 硕士学位论文, 南京理工大学, 2016. 19 Yue Z W. The research on prediction model for dynamic and static recrystallization of as-cast TC21 titanium alloy. Master's Thesis, Taiyuan University of Science and Technology, China, 2020 (in Chinese). 岳振伟. 铸态TC21钛合金动静态再结晶预测模型研究. 硕士学位论文, 太原科技大学, 2020. 20 Stüwe H P, Les P. Acta Mater, 1998, 46(18), 6375. 21 Aly E D. Journal of Materials Processing Technology, 1992, 32(1-2), 243.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2023, Vol. 37 
