材料科学技术(英文版)2024，Vol.186Issue(19) ：64-78.DOI:10.1016/j.jmst.2023.10.049

On the oxidation and interdiffusion behavior of an AlCoCrFeNiY high-entropy alloy bond coat on a directionally solidified Ni-based superalloy

Xuanzhen Liu Ying Chen Ling Li Aihui Huang Han Zhang Xiancheng Zhang Jie Lu Xiaofeng Zhao
材料科学技术(英文版)2024，Vol.186Issue(19) ：64-78.DOI:10.1016/j.jmst.2023.10.049
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On the oxidation and interdiffusion behavior of an AlCoCrFeNiY high-entropy alloy bond coat on a directionally solidified Ni-based superalloy

Xuanzhen Liu 1Ying Chen 2Ling Li 1Aihui Huang 1Han Zhang 1Xiancheng Zhang 3Jie Lu 1Xiaofeng Zhao1
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作者信息

  • 1. Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
  • 2. Department of Materials,The University of Manchester,Manchester M13 9PL,United Kingdom;The Henry Royce Institute,The University of Manchester,Manchester M13 9PL,United Kingdom
  • 3. Key Laboratory of Pressure Systems and Safety,Ministry of Education,School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China
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Abstract

The oxidation and interdiffusion behavior of a novel AlCoCrFeNiY bond coat deposited on a directionally solidified Ni-based superalloy were systematically studied at 1050,1100 and 1150 ℃,and compared with a conventional NiCoCrAlY coating deposited on the same substrate.The AlCoCrFeNiY bond coat exhibits lower oxide growth rates due to its large columnar grains and low Al activity at the oxide scale/bond coat interface.Meanwhile,AlCoCrFeNiY has higher resistance to oxide spallation than NiCoCrAlY,which is attributed to the formation of a clean and defect-free metal/oxide interface.Significant interdiffusion occurs across the AlCoCrFeNiY/superalloy substrate interface.Our experimental evidence and thermody-namic modelling suggest that Fe accelerates interdiffusion and destabilizes the γ'phase,thereby causing the formation of a thick and γ'-depleted interdiffusion zone.In addition,the AlCoCrFeNiY bond coat un-dergoes more Al depletion and subsequent β to γ transformation compared with NiCoCrAlY.Based on the findings in this work,a novel AlCoCrFeNiY/NiCoCrAlY double-layer bond coat was designed,tested and validated to achieve optimal balance between oxidation and interdiffusion.

Key words

AlCoCrFeNi bond coat/Directionally solidified Ni-based superalloy/Oxidation/Interdiffusion/High velocity air-fuel spraying

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基金项目

National Natural Science Foundation of China(52201082)

National Natural Science Foundation of China(51971139)

Science Center for Gas Turbine Project(P2022-A-I-002-001)

Shanghai Sailing Program(22YF1419200)

Chenguang Program supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(21CGA10)

出版年

2024
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

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影响因子：0.657
ISSN：1005-0302
参考文献量68
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