Microstructure stability of γ’+β Ni-Al coated single-crystal superalloy N5 annealed at 1100℃  

作　　者：Jing-Yong Sun Liang-Liang Wei Qiu-Shi Li Sheng-Kai Gong Hong-Bo Guo 

机构地区：[1]School of Energy and Power Engineering,Beihang University,Beijing 100191,China [2]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [3]Key Laboratory of High-Temperature Structural Materials and Coatings Technology,Ministry of Industry and Information Technology,Beijing 100191,China

出　　处：《Rare Metals》2021年第3期693-700,共8页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51590894,51425102 and 51231001)。

摘　　要：γ’+β Binary-phase Ni-Al coatings were prepared on second-generation single-crystal superalloy Rene N5(N5) substrates by electron beam physical vapor deposition.Inter-diffusion behavior between coatings and substrates at 1100℃ and its effects on microstructure stability of the substrates were investigated.A 3-μm-thick substrate diffusion zone(SDZ) layer forms beneath the coating/substrate interface after 5-h heat treatment.The SDZ layer is composed of γ’-Ni_(3) Al phases and needle-like precipitates growing along(100)(110) or(100) <■> direction.After100-h annealing,the thickness of the SDZ layer increases to~17 μm,much lower than that of the single β-NiAl-coated substrate,while keeping single-crystal microstructure.

关 键 词：Ni-Al coating EB-PVD Single-crystal superalloy INTER-DIFFUSION Microstructure stability 

分 类 号：TG174.4[金属学及工艺—金属表面处理]