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Ti-45Al-8(Nb,Hf,Y)-0.2B合金高溫抗氧化性研究
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沈陽航空航天大學

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TG 146.4

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國家自然科學基金（青年基金項目）


Study on the High-temperature Oxidation Resistance of Ti-45Al-8(Nb,Hf,Y)-0.2B Alloys
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Shenyang Aerospace University

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    摘要:

    設計了鈮當量約為8的三種成分合金：Ti-45Al-8Nb-0.2B，Ti-45Al-4Nb-0.5Hf-0.1Y-0.2B，Ti-45Al-7Nb-0.1Hf-0.1Y-0.2B， (at.%)，研究了這三種合金在900℃靜止空氣中的斷續(xù)氧化行為。研究結果表明：Hf、Y聯(lián)合微合金化的合金氧化膜與基體粘附性明顯增強；低Nb/Hf比值的Ti-45Al-4Nb-0.4Hf-0.1Y-0.2B的合金氧化增重小、抗氧化性強，高Nb/Hf比值的Ti-45Al-7Nb-0.1Hf-0.1Y-0.2B合金氧化增重大，抗氧化性差。對氧化膜的掃描電鏡(SEM)、能譜分析(EDS)及X射線衍射（XRD）分析表明，Hf、Y的聯(lián)合加入促進了Al2O3膜的須狀生長形態(tài)，從而提高了氧化膜與基體粘附性，低Nb/Hf比值的合金中形成了較厚的連續(xù)致密的Al2O3膜,提高了合金的抗氧化性；高Nb/Hf比值的合金內存在明顯的外氧化現象，導致了該合金抗氧化性下降。

    Abstract:

    Three kinds of alloys were designed by making the niobium equivalent to eight approximately, compositions of alloys are Ti-45Al-8Nb-0.2B，Ti-45Al-7Nb-0.1Hf-0.1Y-0.2B，Ti-45Al-4Nb-0.5Hf-0.1Y-0.2B，(at.%). The interrupted oxidation behaviors of alloys at 900℃ in static air were studied. The results showed that combined addition of Hf and Y has been enhanced adherence between the oxide film and the substrate; Ti-45Al-4Nb-0.4Hf-0.1Y-0.2B alloy with the low Nb/Hf ratio has lower oxidation weighting and good oxidation resistance, Ti-45Al-7Nb-0.1Hf-0.1Y-0.2B alloy with the high Nb/Hf ratio has higher oxidation weighting and poor oxidation resistance. Oxidized samples were examined by scanning electron microscopy ( SEM ), energy dispersive x-ray analysis ( EDX ) and x-ray diffraction analysis( XRD), it was found that combined addition Hf and Y have been promoted the whisker growth formation of Al2O3 oxide scale, which improved adherence of the oxide film; a large number of continuous and compact Al2O3 oxide scale has found in the alloys with low Nb/Hf ratio, that has been improved oxidation resistance of alloy; in the alloy with high Nb/Hf ratio external oxidation resulted in higher oxidation weighting and poor oxidation resis-tance.

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王艷晶,李菲. Ti-45Al-8(Nb, Hf, Y)-0.2B合金高溫抗氧化性研究[J].稀有金屬材料與工程,2016,45(1):132~136.[Wang Yanjing, Li Fei. Study on the High-temperature Oxidation Resistance of Ti-45Al-8(Nb, Hf, Y)-0.2B Alloys[J]. Rare Metal Materials and Engineering,2016,45(1):132~136.]
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  • 收稿日期:2014-09-24
  • 最后修改日期:2014-11-06
  • 錄用日期:2014-12-25
  • 在線發(fā)布日期: 2019-01-04
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