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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(英文),2020,49(10):3597~3603.[Zhang conghui,Tianwei,Lixuan and.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.]
Effects of Co on Microstructure and High Temperature Oxidation Properties of Cast TiAl-Nb Alloy
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Received:November 11, 2019  Revised:December 05, 2019
DOI:
Key words: TiAl alloy  Co alloying  Microstructure  High temperature oxidation
Foundation item: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
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Zhang conghui,Tianwei,Lixuan and  
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Abstract:
      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.