氧含量对TiAl合金等温氧化行为的影响（英文）
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摘要
研究不同氧含量Ti-45Al-2Fe-2Mo-1Cr合金在空气中950°C下热处理100h的等温氧化行为,并计算其氧化动力学参数。实验结果表明,随着氧含量的增加,该合金的高温抗氧化性能下降,氧化质量增加和氧化膜的厚度增加。随着基体氧含量的变化,近氧化膜表面的合金显微组织呈现不同的形貌:在低氧含量的合金中,可见Z相;在中高氧含量的的合金中,可见τ_2(Al_2FeTi)相。随着氧含量增加,TiAl合金的内氧化现象加剧,其抗氧化性能降低。控制TiAl合金中的氧含量是提高其抗氧化性能的可行方式。
Isothermal oxidation behaviors of Ti-45Al-2Fe-2Mo-1 Cr intermetallics with different oxygen contents were studied under the condition of 950 °C, 100 h in air, and the oxidation kinetic parameters were also evaluated. The results show that the oxidation resistance of the TiAl intermetallics is negatively related to the oxygen content, and both the mass gain and thickness of oxide scale increase with the oxygen content. The sub-surface microstructure of the oxide scales varies with the oxygen content. Z phase is observed in the sub-surface area of the low-oxygen-content alloy, while the τ_2(Al_2 FeTi) phase is found in the medium-oxygen-content and the high-oxygen-content alloys. The deterioration of oxidation resistance is due to the enhanced internal oxidation with the increase of oxygen content. It is possible to improve the oxidation resistance by controlling the oxygen content.
Isothermal oxidation behaviors of Ti-45Al-2Fe-2Mo-1 Cr intermetallics with different oxygen contents were studied under the condition of 950 °C, 100 h in air, and the oxidation kinetic parameters were also evaluated. The results show that the oxidation resistance of the TiAl intermetallics is negatively related to the oxygen content, and both the mass gain and thickness of oxide scale increase with the oxygen content. The sub-surface microstructure of the oxide scales varies with the oxygen content. Z phase is observed in the sub-surface area of the low-oxygen-content alloy, while the τ_2(Al_2 FeTi) phase is found in the medium-oxygen-content and the high-oxygen-content alloys. The deterioration of oxidation resistance is due to the enhanced internal oxidation with the increase of oxygen content. It is possible to improve the oxidation resistance by controlling the oxygen content.
引文
[1]XU Wen-chen,HUANG Kai,WU Shi-feng,ZONG Ying-ying,SHAN De-bin.Influence of Mo content on microstructure and mechanical properties ofβ-containing TiAl alloy[J].Transactions of Nonferrous Metals Society of China,2017,27:820-828.
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[14]BIRKS N,MEIER G H.Introduction to high temperature oxidation of metals[M].Cambridge:Cambridge University Press,2006.
[15]COPLAND E H,GLEESON B,YOUNG D J.Formation of Z-Ti50Al30O20 in the sub-oxide zones ofγ-TiAl based alloys during oxidation at 1000 oC[J].Acta Materialia,1999,47(10):2937-2949.
[16]RAGHAVAN V.Al-Fe-Ti(aluminum-iron-titanium)[J].Journal of Phase Equilibria,2002,23(4):367-374.
[17]PALM F,INDEN G,THOMAS M.The Fe-Al-Ti system[J].Journal of Phase Equilibria,1995,16(3):209-222.
[18]KAINUMA R,FUJITA Y,MITSUI H,OHNUMA I,ISHIDA K.Phase equilibria amongα(hcp),β(bcc)andγ(L10)phases in Ti-Al base ternary alloys[J].Intermetallics,2000,8:855-867.
[19]RAPP R A.Kinetics,Microstructures and mechanism of internal oxidation-its effect and prevention in high temperature alloy oxidation[J].Corrosion,1965,21(12):382-401.
[2]LIU Yong,LIANG Xiao-oeng,LIU Bin,HE Wei-wei,LI Jian-bo,GAN Ziyang,HE Yue-hui.Investigations on processing powder metallurgical high-Nb TiAl alloy sheets[J].Intermetallics,2014,55:80-89.
[3]ZHENG De-shuang,CHEN Rui-run,MA Teng-fei,DINGHong-sheng,SU Yan-qing,GUO Jing-jie,FU Heng-zhi.Microstructure modification and mechanical performances enhancement of Ti44Al6Nb1Cr alloy by ultrasound treatment[J].Journal of Alloys and Compounds,2017,710:409-417.
[4]ZHOU Can-xu,LIU Bin,LIU Yong,QIU Cong-zhang,LI Hui-zhong,HE Yue-hui.Effect of carbon on high temperature compressive and creep properties of beta-stablized Ti Al alloy[J].Transactions of Nonferrous Metals Society of China,2017,27:2400-2405.
[5]CHEN Guang,PENG Ying-bo,ZHENG Gong,QI Zhi-xiang,WANGMin-zhi,YU Hui-chen,DONG Cheng-li,LIU C T.Polysynthetic twinned TiAl single crystals for high-temperature applications[J].Nature Materials,2016,15(8):876-881.
[6]STOLOFF N S,LIU C T,DEEVI S C.Emerging applications of intermetallics[J].Intermetallics,2000,8:1313-1320.
[7]ZHANG Tie-bang,DING Hao,DENG Zhi-hai,ZHONG Hong,HURui,Xue Xiang-yi,LI Jin-shan.Synergistic effect of Nb and Mo on oxidation behavior of TiAl based alloys[J].Rare Metal Materials and Engineering,2012,41(1):33-37.(in Chinese).
[8]YOSHIHARA M,MIURA K.Effects of Nb addition on oxidation behavior of TiAl[J].Intermetallics,1995,3:351-363.
[9]KIM B G,KIM G M,KIM C J.Oxidation behavior of TiAl-X(X=Cr,V,Si,Mo or Nb)intermetallics at elevated temperature[J].Scripta Metallurgica et Materialia,1995,33(7):1117-1125.
[10]SHIDA Y,ANADA H.The effect of various ternary additives on the oxidation behavior of TiAl in high-temperature air[J].Oxidation of Metals,1996,45(1-2):197-219.
[11]WU Y,HWANG S K,HAGIHARA K,UMAKOSHI Y.Isothermal oxidation behavior of two-phase TiAl-Mn-Mo-C-Y alloys fabricated by different processes[J].Intermetallics,2006,14(1):9-23.
[12]SCHAAF P,QUADAKKERS W J,ZHENG N,WALLURA E,GILA.Beneficial and detrimental effects of nitrogen on the oxidation behaviour of TiAl-based intermetallics[J].Materials Corrosion,1997,48(1):28-34.
[13]KEKARE S A,ASWATH P B.Oxidation of TiAl based intermetallics[J].Journal of Materials Science,1997,32(9):2485-2499.
[14]BIRKS N,MEIER G H.Introduction to high temperature oxidation of metals[M].Cambridge:Cambridge University Press,2006.
[15]COPLAND E H,GLEESON B,YOUNG D J.Formation of Z-Ti50Al30O20 in the sub-oxide zones ofγ-TiAl based alloys during oxidation at 1000 oC[J].Acta Materialia,1999,47(10):2937-2949.
[16]RAGHAVAN V.Al-Fe-Ti(aluminum-iron-titanium)[J].Journal of Phase Equilibria,2002,23(4):367-374.
[17]PALM F,INDEN G,THOMAS M.The Fe-Al-Ti system[J].Journal of Phase Equilibria,1995,16(3):209-222.
[18]KAINUMA R,FUJITA Y,MITSUI H,OHNUMA I,ISHIDA K.Phase equilibria amongα(hcp),β(bcc)andγ(L10)phases in Ti-Al base ternary alloys[J].Intermetallics,2000,8:855-867.
[19]RAPP R A.Kinetics,Microstructures and mechanism of internal oxidation-its effect and prevention in high temperature alloy oxidation[J].Corrosion,1965,21(12):382-401.