Effects of Hf, Y, and Zr on Alumina Scale Growth on NiAlCr and NiAlPt Alloys

Dong Eung Kim, Shunli Shang, Zhuoqun Li, Brian Gleeson, Zi-kui Liu

Research output: Contribution to journalArticle

Abstract

The effects of Hf, Y, and Zr additions on the growth of a thermally grown alumina scale formed on NiAlCr and NiAlPt alloys were investigated. Isothermal and thermal cycling oxidation experiments were carried out at 1150 °C, and cross sections of the oxidized samples were characterized using scanning electron microscopy. It was observed that single doping as well as co-doping of Hf, Y, and Zr reduces the rate of alumina scale growth on NiAlCr and NiAlPt alloys, with Hf showing a more significant effect than Y or Zr. The following possible contributing factors to these observations were assessed: (1) the ionic size of the minor alloying elements and (2) the bond strength between the doping elements and oxygen in the oxide grain boundaries in terms of formation and melting enthalpies of oxides. It was concluded that the bond strength between the doping elements and oxygen within the oxide grain boundaries plays an important role in retarding the alumina scale growth.

Original languageEnglish (US)
Pages (from-to)303-313
Number of pages11
JournalOxidation of Metals
Volume92
Issue number3-4
DOIs
StatePublished - Oct 1 2019

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Aluminum Oxide
Alumina
Doping (additives)
Oxides
Chemical elements
Grain boundaries
Oxygen
Thermal cycling
Alloying elements
Enthalpy
Melting
Oxidation
Scanning electron microscopy
Experiments

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

Kim, Dong Eung ; Shang, Shunli ; Li, Zhuoqun ; Gleeson, Brian ; Liu, Zi-kui. / Effects of Hf, Y, and Zr on Alumina Scale Growth on NiAlCr and NiAlPt Alloys. In: Oxidation of Metals. 2019 ; Vol. 92, No. 3-4. pp. 303-313.
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abstract = "The effects of Hf, Y, and Zr additions on the growth of a thermally grown alumina scale formed on NiAlCr and NiAlPt alloys were investigated. Isothermal and thermal cycling oxidation experiments were carried out at 1150 °C, and cross sections of the oxidized samples were characterized using scanning electron microscopy. It was observed that single doping as well as co-doping of Hf, Y, and Zr reduces the rate of alumina scale growth on NiAlCr and NiAlPt alloys, with Hf showing a more significant effect than Y or Zr. The following possible contributing factors to these observations were assessed: (1) the ionic size of the minor alloying elements and (2) the bond strength between the doping elements and oxygen in the oxide grain boundaries in terms of formation and melting enthalpies of oxides. It was concluded that the bond strength between the doping elements and oxygen within the oxide grain boundaries plays an important role in retarding the alumina scale growth.",
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Effects of Hf, Y, and Zr on Alumina Scale Growth on NiAlCr and NiAlPt Alloys. / Kim, Dong Eung; Shang, Shunli; Li, Zhuoqun; Gleeson, Brian; Liu, Zi-kui.

In: Oxidation of Metals, Vol. 92, No. 3-4, 01.10.2019, p. 303-313.

Research output: Contribution to journalArticle

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T1 - Effects of Hf, Y, and Zr on Alumina Scale Growth on NiAlCr and NiAlPt Alloys

AU - Kim, Dong Eung

AU - Shang, Shunli

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AU - Gleeson, Brian

AU - Liu, Zi-kui

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