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Rare Metals

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05.09.2017

Microstructure stability of γ′ + β Ni–Al coated single-crystal superalloy N5 annealed at 1100 °C

verfasst von: Jing-Yong Sun, Liang-Liang Wei, Qiu-Shi Li, Sheng-Kai Gong, Hong-Bo Guo

Erschienen in: Rare Metals | Ausgabe 3/2021

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Abstract

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 °C 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) \(\left\langle {110} \right\rangle\) or (100) \(\left\langle { 1 {\bar{\text{1}}\text{0}}} \right\rangle\) 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.

Vorheriger Artikel Reduction behavior of tungsten oxide with and without scandia doping

Nächster Artikel Temperature-dependent structural, morphological and optical properties of chemical bath-deposited CdS films

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Titel: Microstructure stability of γ′ + β Ni–Al coated single-crystal superalloy N5 annealed at 1100 °C
verfasst von: Jing-Yong Sun
Liang-Liang Wei
Qiu-Shi Li
Sheng-Kai Gong
Hong-Bo Guo
Publikationsdatum: 05.09.2017
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 3/2021
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-017-0954-1

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