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High-Temperature Oxidation Behavior of Ti-22Al-27(Nb, Zr) Alloys
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High-Temperature Oxidation Behavior of Ti-22Al-27(Nb, Zr) Alloys
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National Basic Research Program of China (2011CB605503)

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    摘要:

    研究了Ti2AlNb 基合金Ti-22Al-(27-x)Nb-xZr (x=0, 1, 6, at%)在650~800 ℃的氧化行為。采用XRD和SEM等測(cè)試技術(shù)對(duì)此溫度區(qū)間形成的氧化層特征進(jìn)行了分析。結(jié)果表明，相比Ti-22Al-27Nb，含鋯合金具有較好的抗氧化性能。Ti-22Al-(27-x)Nb-xZr合金在650 ℃氧化100 h，主要氧化產(chǎn)物為TiO2，而在800 ℃氧化100 h，TiO2, Al2O3 和AlNbO4為主要產(chǎn)物，但是在Ti-22Al-21Nb-6Zr合金中還有ZrO2生成。Ti-22Al-26Nb-1Zr合金具有優(yōu)異抗氧化性能，歸因于氧化產(chǎn)物細(xì)化形成了致密的氧化層，而Ti-22Al-21Nb-6Zr合金，雖然在800 ℃也形成了較多Al2O3，但是氧化層中的ZrO2為氧的快速擴(kuò)散提供通道，進(jìn)而導(dǎo)致該合金氧化增重明顯

    Abstract:

    The oxidation behavior of Ti-22Al-(27-x)Nb-xZr (x=0, 1, 6, at%) was evaluated over a temperature range of 650~800 oC in air. The phase composition and the morphology of the formed scales were investigated by X-ray diffraction and scanning electron microscopy. The results show that the alloys containing Zr exhibit better oxidation resistance than Ti-22Al-27Nb alloy. The main oxidation product is TiO2 for all the alloys oxidized at 650 oC for 100 h. A mixture of TiO2, Al2O3 and AlNbO4 is formed for Ti-22Al-27Nb and Ti-22Al-26Nb-1Zr oxidized at 800 oC for 100 h; however, ZrO2 is also traced in Ti-22Al-21Nb-6Zr. The improved oxidation resistance for Ti-22Al-26Nb-1Zr can be ascribed to the refinement of oxides. While in Ti-22Al-21Nb-6Zr alloy, although formation of Al2O3 is obvious at 800 oC, ZrO2 in the scale can provide sites for rapid oxygen transport, leading to the high mass gain

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黨 薇,李金山,張鐵邦,寇宏超. High-Temperature Oxidation Behavior of Ti-22Al-27(Nb, Zr) Alloys[J].稀有金屬材料與工程,2015,44(2):261~266.[Dang Wei, Li Jinshan, Zhang Tiebang, Kou Hongchao. High-Temperature Oxidation Behavior of Ti-22Al-27(Nb, Zr) Alloys[J]. Rare Metal Materials and Engineering,2015,44(2):261~266.]
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  • 收稿日期:2014-08-14
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  • 在線發(fā)布日期: 2015-05-29
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