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

作　　者：Xuanzhen Liu Ying Chen Ling Li Aihui Huang Han Zhang Xiancheng Zhang Jie Lu Xiaofeng Zhao 

机构地区：[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 M139PL,United Kingdom [3]The Henry Royce Institute,The University of Manchester,Manchester M139PL,United Kingdom [4]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

出　　处：《Journal of Materials Science & Technology》2024年第19期64-78,共15页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52201082 and 51971139);the Science Center for Gas Turbine Project(No.P2022-A-I-002-001);the Shanghai Sailing Program(No.22YF1419200);sponsored by the Chenguang Program supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(No.21CGA10).

摘　　要：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°C,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 theγ’phase,thereby causing the formation of a thick andγ’-depleted interdiffusion zone.In addition,the AlCoCrFeNiY bond coat un-dergoes more Al depletion and subsequentβtoγtransformation 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.

关 键 词：AlCoCrFeNi bond coat Directionally solidified Ni-based superalloy OXIDATION INTERDIFFUSION High velocity air-fuel spraying 

分 类 号：TG146.15[一般工业技术—材料科学与工程]