王艳晶,李菲.Ti-45Al-8(Nb,Hf,Y)-0.2B合金高温抗氧化性研究[J].稀有金属材料与工程,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.]
Ti-45Al-8(Nb,Hf,Y)-0.2B合金高温抗氧化性研究
投稿时间:2014-09-24  修订日期:2014-11-06
中文关键词:  TiAl合金  高温氧化  Hf、Y微合金化
基金项目:国家自然科学基金(青年基金项目)
中文摘要:
      设计了铌当量约为8的三种成分合金:Ti-45Al-8Nb-0.2B,Ti-45Al-4Nb-0.5Hf-0.1Y-0.2B,Ti-45Al-7Nb-0.1Hf-0.1Y-0.2B, (at.%),研究了这三种合金在900℃静止空气中的断续氧化行为。研究结果表明:Hf、Y联合微合金化的合金氧化膜与基体粘附性明显增强;低Nb/Hf比值的Ti-45Al-4Nb-0.4Hf-0.1Y-0.2B的合金氧化增重小、抗氧化性强,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。对氧化膜的扫描电镜(SEM)、能谱分析(EDS)及X射线衍射(XRD)分析表明,Hf、Y的联合加入促进了Al2O3膜的须状生长形态,从而提高了氧化膜与基体粘附性,低Nb/Hf比值的合金中形成了较厚的连续致密的Al2O3膜,提高了合金的抗氧化性;高Nb/Hf比值的合金内存在明显的外氧化现象,导致了该合金抗氧化性下降。
Study on the High-temperature Oxidation Resistance of Ti-45Al-8(Nb,Hf,Y)-0.2B Alloys
英文关键词:TiAl intemetallic compound  high temperature oxidation  Hf,Y microalloying
英文摘要:
      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.
作者单位E-mail
王艳晶 沈阳航空航天大学 wangyj2006@163.com 
李菲 沈阳航空航天大学  
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