Microstructure stability of γ’+β Ni-Al coated single-crystal superalloy N5 annealed at 1100℃
来源期刊：Rare Metals2021年第3期
论文作者：Jing-Yong Sun Liang-Liang Wei Qiu-Shi Li Sheng-Kai Gong Hong-Bo Guo
文章页码：693 - 700
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’-Ni3 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.
Jing-Yong Sun1，Liang-Liang Wei2,3，Qiu-Shi Li1，Sheng-Kai Gong2,3，Hong-Bo Guo2,3
1. School of Energy and Power Engineering,Beihang University2. School of Materials Science and Engineering,Beihang University3. Key Laboratory of High-Temperature Structural Materials and Coatings Technology,Ministry of Industry and Information Technology
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’-Ni3 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：
