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
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 693-700
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s12598-017-0954-1

摘要

γ'+ β Binary-phase Ni-Al coatings were prepared on second-generation single-crystal superalloy René 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'-Ni3Al phases and needle-like precipitates growing along (100) <110> or (100) <1(1)0> direction.After 100-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.