Impurity concentration effects on the structures, ductile and electronic properties of Zr-doped gamma-TiAl alloys

Song Qing-Gong; Qin Guo-Shun; Yang Bao-Bao; Jiang Qing-Jie; Hu Xue-Lan

doi:10.7498/aps.65.046102

Abstract

This investigation aims at the Zr-doping in -TiAl alloy systems in which Ti (or Al) atoms are partly replaced and the impurity concentrations are 1/54, 1/36, 1/24 and 1/16 (molar ratio), respectively. The structural, energy, plastic and electronic properties of the alloys are calculated and studied by using the first-principles method based on the density functional theory and other physical theory. From geometry optimization results it is shown that doping with Zr can change the structural symmetry of the -TiAl systems. These results also suggest that the cubic degree of Zr-doped -TiAl alloys can be increased due to the Zr-substitution. For instance, the cubic degrees of Ti12Al11Zr and Ti18Al17Zr systems are enhanced distinctly, which are positive for improving the mechanical properties of the alloys. The average formation energies obtained indicate that the Ti atom replaced by Zr can slightly decrease the formation energy of the system (0.003 eV/atom); while Zr substituting the Al atom can increase the formation energies of the systems (0.07 eV/atom). Accordingly, when Zr atoms are introduced in the -TiAl system, they tend to substitute Ti atoms, and can also substitute Al atoms with a certain possibility. Thus, various Zr-doped -TiAl regions can be produced in the system. The integral effects are of significance for improving the performance of the -TiAl based alloys by means of Zr-doping method. Comparing the axial ratios of Zr-doped -TiAl systems with that of pure -TiAl system, we find that Zr substituting Al atom can reduce the axial ratio of the Zr-doped alloys, which is responsible for the ductility of the materials. It should be mentioned that when the impurity concentration is in the range of 1.85 at%-6.25 at%, the doping effect will be most distinct and the axial ratio of the alloys is close to unity. It is expected that the Ti12Al11Zr system has a good ductility for its axial ratio equals to 1.007. The band structures of Zr-doped -TiAl systems show that they all have metallic conductivities. After Zr atom substitutes the Al atom in the -TiAl system, the intensity of covalent bond between Zr atom and its nearest neighbour Ti atoms in Ti12Al11Zr system reduces evidently and the bond length increases (0.032 ), which is indicated by the obtained overlap population (decrease by 0.21) and the densities of states in the Zr-doped and pure -TiAl systems. These results in the decrease of average intensity of Ti-Al(Zr) bonds and the increase of metallic bonds in Ti12Al11Zr system, which is an important factor for improving the ductility of -TiAl based alloys.

Keywords:

Authors and contacts

1.
Institute of Low Dimension Material and Technology, College of Science, Civil Aviation University of China, Tianjin 300300, China;
2.
Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China

Corresponding author: Song Qing-Gong, qgsong@cauc.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 51201181).

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[28]	Liu X K, Liu C, Zheng Z, Lan X H 2013 Chin. Phys. B 22 087102
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[32]	Kawabata T, Tamura T, Izumi O 1993 Metal. Trans. A 24 141
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Cited By

[1]	Kunal K, Ramachandran R, Norman M W 2012 Prog. Aerosp. Sci. 55 01
[2]	Helmut C, Svea M 2013 Adv. Eng. Mater. 15 191
[3]	Peng C Q, Huang B Y, He Y H 1998 Chin. J. Nonferr. Met. 8 11 (in Chinese) [彭超群, 黄伯云, 贺跃辉 1998 中国有色金属学报 8 11]
[4]	Lin J P, Zhang L Q, Song X P, Ye F, Chen G L 2010 Mater. China 29 1 (in Chinese) [林均品, 张来启, 宋西平, 叶丰, 陈国良 2010 中国材料进展 29 1]
[5]	Liu D, Zhang L J, Mi L, Guo K, Xue X Y 2014 Prog. Tita. 31 11 (in Chinese) [刘娣, 张利军, 米磊, 郭凯, 薛祥义 2014 钛工业进展 31 11]
[6]	Gilchrist A, Pollock T M 2001 Structural Intermetallics 2001 (Jackson Hole: TMS) p3
[7]	Liu C T, Kim Y W 1992 Scr. Metall. Mater. 27 599
[8]	Li J S, Zhang T B, Chang H, Kou H C, Zhou L 2010 Mater. China 29 1 (in Chinese) [李金山, 张铁邦, 常辉, 寇宏超, 周廉 2010 中国材料进展 29 1]
[9]	Shu S L, Qiu F, Tong C Z, Shan X N, Jiang Q C 2014 J. Alloys Compd. 617 302
[10]	Stroosmijder M F, Zheng N, Quadakkers W J, Hofman R, Gil A, Lanza A 1996 Oxid. Met. 46 19
[11]	Hao Y L, Yang R, Cui Y Y 2000 Acta Mater. 48 1313
[12]	Hu Q M, Vitos L, Yang R 2014 Phys. Rev. B 90 4109
[13]	Gouda M K, Nakamura K, Gepreel M A H 2015 J. Appl. Phys. 117 4905
[14]	Dang H L, Wang C Y, Yu T 2007 Acta Phys. Sin. 56 2838 (in Chinese) [党宏丽, 王崇愚, 于涛 2007 56 2838]
[15]	Chen L 2010 J. Xinyang Normal Univ. 23 57 (in Chinese) [陈律 2010 信阳师范学院学报 23 57]
[16]	Liu X K, Zheng Z, Liu C, Lan X H, Yin W 2012 Mater. Rev. 26 115 (in Chinese) [刘显坤, 郑洲, 刘聪, 兰晓华, 尹伟 2012 材料导报 26 115]
[17]	Song Q G, Yan H Y, Kang J H, Song L L, Guo F J 2014 Mater. Rev. 28 150 (in Chinese) [宋庆功, 闫洪洋, 康建海, 宋玲玲, 果福娟 2014 材料导报 28 150]
[18]	Song Q G, Yan H Y, Guo F J, Xu T Y, Kang J H, Hu X L 2014 J. Func. Mater. 19 149 (in Chinese) [宋庆功, 闫洪洋, 果福娟, 徐霆耀, 康建海, 胡雪兰 2014 功能材料 19 149]
[19]	Kastenhuber M, Rashkova B, Clemens H, Mayer S 2015 Intermetallics 63 19
[20]	Klein T, Schachermayer M, Mendez-Martin F, Schoberl T, Rashkova B, Clemens H, Mayer S 2015 Acta Mater. 94 205
[21]	Jiang M L 2014 M. S. Dissertation (Changsha: Zhongnan University) (in Chinese) [蒋孟玲 2014 硕士学位论文(长沙: 中南大学)]
[22]	Liu Z C, Lin J P, Li S J, Chen G L 2002 Intermetallics 10 653
[23]	Liu Y L, Li H, Wang S Q, Ye H Q 2009 J. Mater. Res. 24 3165
[24]	Qiu C Z, Liu Y, Huang L, Zhang W, Liu B, Lu B 2012 T. Nonferr. Metal Soc. 22 521
[25]	Hodge A M, Hsiung L M, Nieh T G 2004 Scripta Mater. 51 411
[26]	Li H, Wang S Q, Ye H Q 2009 Acta Phys. Sin. 58 S224 (in Chinese) [李虹, 王绍青, 叶恒强 2009 58 S224]
[27]	Huang Y Y, Wu W M, Deng W, Zhong X P, Xiong L Y, Cao M Z, Long Q W 2000 Chin. J. Nonferr. Met. 10 796 (in Chinese) [黄宇阳, 吴伟明, 邓文, 钟夏平, 熊良钺, 曹名洲, 龙期威 2000 中国有色金属学报 10 796]
[28]	Liu X K, Liu C, Zheng Z, Lan X H 2013 Chin. Phys. B 22 087102
[29]	Chen G L, Lin J P 1999 Physicalmetallurgy Basis of Ordered Intermetallic Compound Structure Materials (Beijing:Metallurgical Industry Press) p285 (in Chinese) [陈国良, 林均品 1999 有序金属间化合物结构材料物理金属学基础 (北京: 冶金工业出版社) 第285页]
[30]	Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865
[31]	Hao J M, Wen Y L, Zhang S M 1995 J. Appl. Sci. 04 400 (in Chinese) [郝建民, 温业礼, 张世敏 1995 应用科学学报 04 400]
[32]	Kawabata T, Tamura T, Izumi O 1993 Metal. Trans. A 24 141
[33]	Shang J X, Yu T B 2009 Acta Phys. Sin. 58 1179 (in Chinese) [尚家香, 于潭波 2009 58 1179]
[34]	Speight J G 2005 Lange's Handbook of Chemistry (16th Ed.) (Boston: McGraw-Hill Professional) Table 1.31
[35]	Xu J H, Freeman A J 1989 Phys. Rev. B 40 11927
[36]	Carlsson A E, Meschter P J 1989 J. Mater. Res. 4 1060

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Vol. 65, Issue 4 - 2016-02-20

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