张聪惠,田伟,李轩,田进.Co对铸态TiAl-Nb合金组织和高温氧化性能的影响[J].稀有金属材料与工程,2020,49(10):3597~3603.[Zhang conghui,Tianwei,Lixuan.Effects of Co on Microstructure and High Temperature Oxidation Properties of Cast TiAl-Nb Alloy[J].Rare Metal Materials and Engineering,2020,49(10):3597~3603.]
Co对铸态TiAl-Nb合金组织和高温氧化性能的影响
投稿时间:2019-11-11  修订日期:2019-12-05
中文关键词:  TiAl合金  Co合金化  合金组织  高温氧化
基金项目:国家自然科学基金 (51961003); 陕西省重点研发计划(2018GY-112);陕西省重点产业创新链(群)2019ZDLGY05-03
中文摘要:
      采用非自耗电弧熔炼方法经多次重熔制备了Ti45Al-6Nb-xCo合金(x=0, 0.5, 1, 2和4 at.%),研究了不同Co含量合金的组织结构和高温抗氧化性能。结果表明,增加合金中的Co含量能够细化α2+γ片层组织,促进合金中形成γ和B2相,并抑制α2相形成;合金中Co含量超过2 at.%会导致富Co相析出和组织粗化。1000℃空气中的恒温氧化结果表明,适量的Co合金化能够显著改善TiAl-Nb合金的高温抗氧化性能;Ti45Al-6Nb-1Co合金的氧化的抛物线速率常数约为1.36×10-2mg2/cm4h,较Ti45Al-Nb合金低约1个数量级;但Co含量超过2 at.%后,随Co含量增加,合金的氧化速率呈增加趋势。
Effects of Co on Microstructure and High Temperature Oxidation Properties of Cast TiAl-Nb Alloy
英文关键词:TiAl alloy  Co alloying  Microstructure  High temperature oxidation
英文摘要:
      Ti45Al-6Nb-xCo (x=0, 0.5, 1, 2 and4 at.%) alloys were prepared using non- consumable arc melting method by three times of remelts. The microstructure and high temperature oxidation behavior of the alloys with different Co concentrations were investigated. The results show that increase of Co concentration in the alloy can significantly refine the α2+γ lamellaer, promote the formation of γ and B2 phases while inhibit the formation of α2 phase. Co-rich precipitates and microstructure coarsening were observed when concentration of Co is higher than 2 at.% in the alloy. The static oxidation results at 1000 ℃ in air show that the oxidation resistance of TiAl-Nb alloy has been remarkably improved by appropriate Co alloying. The oxidation parabolic rate constant of the Ti45Al-6Nb-1Co alloy is about 1.36×10-2mg2/cm4h, lower than that of the Ti45Al-Nb alloy by about one order of magnitude. However, once the concentration of Co exceeds 2 at.%, increase of Co concentration in the alloy lead to an increase of the oxidation rate of the alloy.
作者单位邮编
张聪惠 西安建筑科技大学 710055
田伟 中联西北工程设计研究院有限公司 710082
李轩 四川轻化工大学 643000
田进 西安建筑科技大学冶金工程学院 
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