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赵广迪,臧喜民,李万明,薛超超.B对一种高Al+Ti镍基高温合金氧化行为的影响[J].稀有金属材料与工程(英文),2020,49(6):2109~2117.[Zhao Guangdi,Zang Ximin,Li Wanming and Xue Chaochao.Effect of B on the high temperature oxidation behavior of a nickel-base superalloy with high Al and Ti contents[J].Rare Metal Materials and Engineering,2020,49(6):2109~2117.]
Effect of B on the high temperature oxidation behavior of a nickel-base superalloy with high Al and Ti contents
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Received:May 09, 2019  Revised:May 21, 2019
DOI:
Key words: Nickel-base superalloy  oxidation  boron
Foundation item:国家自然科学基金资助(项目号U1560203)
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Zhao Guangdi,Zang Ximin,Li Wanming and Xue Chaochao  
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Abstract:
      Three U720Li ingots with different B contents were produced by vacuum induction melting and afterwards they were fully homogenized. The effect of B on the isothermal oxidation behavior of as-homogenized U720Li alloy at 1100 ℃ was investigated by a discontinuous increasing weight method. After the homogenization treatment, extremely serious B depletion from the alloy matrix was found by ICP-AES, indicating that B could diffuse rapidly towards the oxide scale during high temperature air exposure (above 1100 ℃). The B addition decreased the oxidation rate and reduced the volume fraction of pores and the thickness of γ′ depleted layer. The scales formed on both low B and high B alloys consist of three layers, loose outer layer composed of (Ni/Co)O, TiO2 and complex spinel, compact intermediate layer is mainly Cr2O3 and discrete internal oxides are Al2O3+TiO2. It is deemed that B improves the oxidation resistance mainly by promoting the formation of a more continuous and protective Cr2O3 intermediate layer.