Ti<sub>2</sub>AlNb基合金高温氧化初期热力学分析

Abstract
Figure/Table
References
Related Citation (4)

Download: PDF (120469 KB) HTML (0 KB)
Export: BibTeX | EndNote (RIS)

Abstract The initial oxidation products of Ti-22Al-xNb(x=0-30%, mole fraction) alloy at 1 000 ℃ were calculated by phase diagram calculation. The changes of mass fraction and phase composition of Ti-22Al-27Nb and Ti-22Al-15Nb alloys at the initial stage of oxidation at this temperature were predicted. The results show that, with the increase of oxygen partial pressure, Bcc_B2 phase in the matrix changes to Hcp_A3 phase to dissolve the increased O(oxygen). The oxidation order of the elements in the alloy is Al, Ti, Nb. Al₂O₃, Halite(TiO) and NbO appear at the oxygen partial pressures of 4.72×10^-32MPa, 4.11×10^-30 MPa and 5.53×10^-25MPa, respectively. With the increase of oxygen partial pressure, the oxidation products of Ti and Nb tend to higher oxygen content. Compared with Ti-22Al-27Nb, the mass fractions of NbO and NbO₂ in Ti-22Al-15Nb alloy decrease obviously, while the mass fraction of Al₂O₃ increases obviously.

Key words： Ti₂AlNb phase diagram calculation high temperature oxidation phase composition thermodynamic calculation

Received: 06 January 2020 Published: 19 June 2020

ZTFLH:

TG146.2⁺3

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	YANG Jiajun
	LIU Libin
	ZHAO Yun
	ZHANG Ligang

Cite this article:

YANG Jiajun,LIU Libin,ZHAO Yun, et al. Thermodynamic analysis of Ti₂AlNb-based alloy in the initial stage of high temperature oxidation[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(2): 98-103.

URL:

http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I2/98

[1] WANG W, ZENG W, XUE C, et al.Quantitative analysis of the effect of heat treatment on microstructural evolution and microhardness of an isothermally forged Ti-22Al-25Nb(at.%) orthorhombic alloy[J]. Intermetallics, 2014, 45: 29-37.
[2] 周伟, 姚泽坤, 秦春. 工艺参数对粗晶Ti₂AlNb合金超塑性行为的影响[J]. 稀有金属材料与工程, 2014, 43(1): 209-213.
ZHOU Wei, YAO Zekun, QIN Chun.Effects of process parameters on the superplastic behavior of coarse grain Ti₂AlNb alloy[J]. Rare Metal Materials and Engineering, 2014, 43(1): 209-213.
[3] KUMPFERT J.Intermetallic alloys based on orthorhombic titanium aluminide[J]. Adv Eng Mater, 2001, 3(11): 851-864.
[4] XUE C, ZENG W, XU B, et al.B2 grain growth and particle pinning effect of Ti-22Al-25Nb orthorhombic intermetallic alloy during heating process[J]. Intermetallics, 2012, 29: 41-47.
[5] WANG W, ZENG W, XUE C, et al.Microstructure control and mechanical properties from isothermal forging and heat treatment of Ti-22Al-25Nb(at.%) orthorhombic alloy[J]. Intermetallics, 2015, 56: 79-86.
[6] CHEN X, WEIDONG Z, WEI W, et al.The enhanced tensile property by introducing bimodal size distribution of lamellar O for O+B2 Ti₂AlNb based alloy[J]. Materials Science and Engineering A, 2013, 587: 54-60.
[7] COWEN C J, BOEHLERT C J.Microstructure, creep, and tensile behavior of a Ti-21Al-29Nb(at.%) orthorhombic+B2 alloy[J]. Intermetallics, 2006, 14(4): 412-422.
[8] HAGIWARA M, EMURA S, ARAOKA A, et al.Enhanced mechanical properties of orthorhombic Ti₂AlNb-based intermetallic alloy[J]. Metals and Materials International, 2003, 9(3): 265-272.
[9] SHEN Y, DING X, WANG F, et al.High temperature oxidation behavior of Ti-Al-Nb ternary alloys[J]. Journal of Materials Science, 2004, 39(21): 6583-6589.
[10] LEYENS C, GEDANITZ H.Long-term oxidation of orthorhombic alloy Ti-22Al-25Nb in air between 650 and 800 ℃[J]. Scripta Materialia, 1999, 41(8): 901-906.
[11] LEYENS C.Environmental effects on orthorhombic alloy Ti-22Al-25Nb in air between 650 and 1 000 ℃[J]. Oxidation of Metals, 1999, 52(5/6): 475-503.
[12] RALISON A, DETTENWANGER F, SCHÜTZE M. Oxidation of orthorhombic Ti₂AlNb alloys at 800 ℃ in air[J]. Materials and Corrosion, 2000, 51(5): 317-328.
[13] RALISON A, DETTENWANGER F, SCHÜTZE M. Oxidation of orthorhombic Ti₂AlNb alloys in the temperature range 550- 1 000 ℃ in air[J]. Materials at High Temperatures, 2014, 20(4): 607-629.
[14] MAŁECKA J. Investigation of the oxidation behavior of orthorhombic Ti₂AlNb alloy[J]. Journal of Materials Engineering and Performance, 2015, 24(5): 1834-1840.
[15] XIANG J M, MI G B, QU S J, et al.Thermodynamic and microstructural study of Ti₂AlNb oxides at 800 ℃[J]. Sci Rep, 2018, 8(1): 12761-12771.
[16] SHI J, LI H Q, WAN M Q, et al.High temperature oxidation and inter-diffusion behavior of electroplated Ni-Re diffusion barriers between NiCoCrAlY coating and orthorhombic-Ti₂AlNb alloy[J]. Corrosion Science, 2016, 102: 200-208.
[17] DANG W, LI J S, ZHANG T B, et al.Oxidation behavior of Zr-containing Ti₂AlNb-based alloy at 800 ℃[J]. Transactions of Nonferrous Metals Society of China, 2015, 25(3): 783-790.
[18] SAUNDERS N, MIODOWNIK A P.CALPHAD (Calculation of Phase Diagrams): A comprehensive Guide[M]. Elsevier, 1998.
[19] 戴占海, 卢锦堂, 孔纲. 相图计算的研究进展[J]. 材料导报, 2006(4): 94-97.
DAI Zhanhai, LU Jintang, KONG Gang.Progress in study on CALPHAD approach[J]. Materials Reports, 2006(4): 94-97.
[20] 鲁晓刚, 王卓, CUI Y W, 等. 计算热力学、计算动力学与材料设计[J]. 科学通报, 2013, 58(35): 3656-3664.
LU Xiaogang, WANG Zhuo, CUI Y W, et al.Computational thermodynamics, computational kinetics, and material design[J]. Chinese Science Bulletin, 2013, 58(35): 3656-3664.
[21] ILATOVSKAIA M, SAVINYKH G, FABRICHNAYA O.Thermodynamic description of the Ti-Al-O system based on experimental data[J]. Journal of Phase Equilibria and Diffusion, 2016, 38(3): 175-184.
[22] WITUSIEWICZ V T, BONDAR A A, HECHT U, et al.The Al-B-Nb-Ti system IV. experimental study and thermodynamic re-evaluation of the binary Al-Nb and ternary Al-Nb-Ti systems[J]. Journal of Alloys and Compounds, 2009, 472(1/2): 133-161.
[23] PÉREZ R J, MASSIH A R. Thermodynamic evaluation of the Nb-O-Zr system[J]. Journal of Nuclear Materials, 2007, 360(3): 242-254.
[24] LEYENS C.Oxidation of orthorhombic ritanium aluminide TI- 22AL-25NB in air between 650 and 1 000 ℃[J]. Journal of Materials Engineering and Performance, 2001, 10(2): 225-230.