Effect of dysprosium addition on the cyclic oxidation behaviour of CoNiCrAlY alloy

Liu, Hao; Yang, Zhigang; Xia, Zhouhui; Zhang, Y.-D.; Zhang, C.

doi:10.1016/j.corsci.2011.01.023

Cited by 23 publications

(4 citation statements)

References 31 publications

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“…A lot of work has been focused on improving the cyclic oxidation behavior of β-NiAl at high temperatures. It has been shown that minor addition of reactive elements (REs), like Hf, Zr, Y and Dy, can both improve the oxide scale adhesion and reduce the scale growth rate [14][15][16][17][18][19][20][21]. The effects of various RE dopants in β-NiAl were investigated by Guo et al [22], indicating that the addition of Hf and Zr exhibited a better RE effect than Dy, Y and La.…”

Section: Introductionmentioning

confidence: 99%

Surface Rumpling Behavior of Hf/Zr Single-Doped and Co-Doped β-NiAl Coatings during High-Temperature Cyclic Oxidation

Wang

Song

et al. 2020

Coatings

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Reactive elements like Hf- and Zr-doped β-NiAl are considered to be promising candidate materials for protective coatings used at ultra-high temperatures. However, the role of reactive element co-doping on cyclic oxidation behavior and the surface rumpling of β-NiAl coatings remains unclear. Thus, in this paper, Hf and Zr single-doped and co-doped β-NiAl coatings were deposited on a single crystal superalloy by electron beam physical vapor deposition and the cyclic oxidation at 1150 °C was investigated. The coatings yielded a similar oxidation rate during cyclic oxidation. Obvious surface rumpling appeared in the single-doped coatings, whereas it was effectively alleviated in the co-doped coating. Related mechanisms were discussed, including thermal expansion mismatch, martensitic transformation and phase transformation from β-NiAl to γ′-Ni3Al. The non-uniform phase transformation from β to γ′ was finally believed to be responsible for the discrepancy in the rumpling extents between the single-doped and co-doped coatings.

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Section: Introductionmentioning

confidence: 99%

Surface Rumpling Behavior of Hf/Zr Single-Doped and Co-Doped β-NiAl Coatings during High-Temperature Cyclic Oxidation

Wang

Song

et al. 2020

Coatings

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“…Su et al [15] found that the addition of Ge and B promoted the growth of protective SiO 2 phase and thus improved the oxidation resistance of Nb-Si-based alloys. It has also been well established that small additions of rare earth elements, added in the form of elements or as oxide dispersions, can greatly improve the oxidation resistance of metals as well as coatings [16][17][18][19]. As one of the rare earth elements, Dy has been employed to improve the oxidation resistance of NiAl-based alloy [20] and coatings [18].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and High-Temperature Oxidation Behavior of Dy-Doped Nb–Si-Based Alloys

Guo

Zhang

Kong

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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Microstructures and oxidation behaviors of four Dy-doped Nb-Si-based alloys at 1250°C were investigated. The nominal compositions of the four alloys are Nb-15Si-24Ti-4Cr-2Al-2Hf-xDy (at.%), where x = 0, 0.05, 0.10 and 0.15, respectively. Results showed that the four alloys all consisted of Nbss, aNb 5 Si 3 and cNb 5 Si 3 , and the addition of Dy produced no obvious effect on the phase constitution and the microstructures of Nb-Si-based alloys. After oxidation at 1250°C for 58 h, it was found that the addition of Dy accelerated the oxidation rate of Nb-Si-based alloys and caused a larger weight gain, accompanied by the formation of a more porous and less protective oxide scale. The oxides of Nb 2 O 5 , Ti 2 Nb 10 O 29 , TiNb 2 O 7 , Ti 0.4 Cr 0.3 Nb 0.3 O 2 and glassy SiO 2 were formed on Dy-doped Nb-Si-based alloys. The hightemperature oxidation mechanism of Dy-doped Nb-Si-based alloys was discussed.

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“…Hence systematic knowledge on the formation mechanisms of the BCC metal/oxide interface is required for the design of radiation resistant alloys such as ODS steels. Related works indicate that irradiation induced defects in the BCC metal alloy/oxide system are very mobile and easily annihilated [19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Comparison of interface structure of BCC metallic (Fe, V and Nb) films on MgO (100) substrate

Zhang

et al. 2017

Applied Surface Science

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This study systematically investigates the interface structure of three body-centered-cubic (BCC) metallic (Fe, V and Nb) films grown on MgO(100) substrates through experiments and simulations. Orientation relationships of their interfaces with the different lattice mismatch exhibit cube-on-cube configurations. The misfit dislocations at these three interfaces exhibit different characteristics. High resolution TEM (HRTEM), combined with first principle calculations, demonstrates the O-atop match type between metal atoms and MgO substrates for the first time. The fundamental mechanism in determining the interface configuration is discussed in term of the work of separation and the delocalization of atomic charge density.

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Effect of dysprosium addition on the cyclic oxidation behaviour of CoNiCrAlY alloy

Cited by 23 publications

References 31 publications

Surface Rumpling Behavior of Hf/Zr Single-Doped and Co-Doped β-NiAl Coatings during High-Temperature Cyclic Oxidation

Surface Rumpling Behavior of Hf/Zr Single-Doped and Co-Doped β-NiAl Coatings during High-Temperature Cyclic Oxidation

Microstructure and High-Temperature Oxidation Behavior of Dy-Doped Nb–Si-Based Alloys

Comparison of interface structure of BCC metallic (Fe, V and Nb) films on MgO (100) substrate

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