TEM study of scale microstructures formed on Ni-10Cr and Ni-10Cr-5Al alloys with and without Y addition

A. Ul-Hamid

doi:10.1023/A:1016060423612

TEM study of scale microstructures formed on Ni-10Cr and Ni-10Cr-5Al alloys with and without Y addition

A. Ul-Hamid^*

^*Corresponding author for this work

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18 Scopus citations

Abstract

A study was conducted to investigate the effect of Y addition on the isothermal-oxidation behaviors of Ni-10Cr, Ni-10Cr-0.5Y, Ni-10Cr-5Al, and Ni-10Cr-5Al-0.5 Y alloys. The alloys were oxidized in air for 50 hr at 1000°C. The oxides formed on the alloys were characterized using primarily cross-sectional transmission-electron microscopy techniques along with light microscopy, scanning-electron microscopy, and X-ray diffraction. Although the Al-containing alloys showed comparatively better oxidation behavior, all alloys exhibited "nonprotective" scaling, as suggested by the thick oxides formed. The major component of the outer oxide was NiO. However, modified Y-containing alloys formed protective layers (i.e., α-Cr₂O₃for NiCrY and αAl₂O₃ for NiCrAlY) at the scale-alloy interface following the nonprotective scaling. The spoiling resistance of the modified Y-containing alloys was better than their counterpart unmodified Y-free alloys, while their overall oxidation mechanism remained unchanged after Y addition.

Original language	English
Pages (from-to)	41-56
Number of pages	16
Journal	Oxidation of Metals
Volume	58
Issue number	1-2
DOIs	https://doi.org/10.1023/A:1016060423612
State	Published - Aug 2002

Keywords

NiCr
Oxide
TEM
Yttrium
α-AlO
α-CrO

ASJC Scopus subject areas

Inorganic Chemistry
Metals and Alloys
Materials Chemistry

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title = "TEM study of scale microstructures formed on Ni-10Cr and Ni-10Cr-5Al alloys with and without Y addition",

abstract = "A study was conducted to investigate the effect of Y addition on the isothermal-oxidation behaviors of Ni-10Cr, Ni-10Cr-0.5Y, Ni-10Cr-5Al, and Ni-10Cr-5Al-0.5 Y alloys. The alloys were oxidized in air for 50 hr at 1000°C. The oxides formed on the alloys were characterized using primarily cross-sectional transmission-electron microscopy techniques along with light microscopy, scanning-electron microscopy, and X-ray diffraction. Although the Al-containing alloys showed comparatively better oxidation behavior, all alloys exhibited {"}nonprotective{"} scaling, as suggested by the thick oxides formed. The major component of the outer oxide was NiO. However, modified Y-containing alloys formed protective layers (i.e., α-Cr2O3for NiCrY and αAl2O3 for NiCrAlY) at the scale-alloy interface following the nonprotective scaling. The spoiling resistance of the modified Y-containing alloys was better than their counterpart unmodified Y-free alloys, while their overall oxidation mechanism remained unchanged after Y addition.",

keywords = "NiCr, Oxide, TEM, Yttrium, α-AlO, α-CrO",

author = "A. Ul-Hamid",

year = "2002",

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language = "English",

volume = "58",

pages = "41--56",

journal = "Oxidation of Metals",

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TY - JOUR

T1 - TEM study of scale microstructures formed on Ni-10Cr and Ni-10Cr-5Al alloys with and without Y addition

AU - Ul-Hamid, A.

PY - 2002/8

Y1 - 2002/8

N2 - A study was conducted to investigate the effect of Y addition on the isothermal-oxidation behaviors of Ni-10Cr, Ni-10Cr-0.5Y, Ni-10Cr-5Al, and Ni-10Cr-5Al-0.5 Y alloys. The alloys were oxidized in air for 50 hr at 1000°C. The oxides formed on the alloys were characterized using primarily cross-sectional transmission-electron microscopy techniques along with light microscopy, scanning-electron microscopy, and X-ray diffraction. Although the Al-containing alloys showed comparatively better oxidation behavior, all alloys exhibited "nonprotective" scaling, as suggested by the thick oxides formed. The major component of the outer oxide was NiO. However, modified Y-containing alloys formed protective layers (i.e., α-Cr2O3for NiCrY and αAl2O3 for NiCrAlY) at the scale-alloy interface following the nonprotective scaling. The spoiling resistance of the modified Y-containing alloys was better than their counterpart unmodified Y-free alloys, while their overall oxidation mechanism remained unchanged after Y addition.

AB - A study was conducted to investigate the effect of Y addition on the isothermal-oxidation behaviors of Ni-10Cr, Ni-10Cr-0.5Y, Ni-10Cr-5Al, and Ni-10Cr-5Al-0.5 Y alloys. The alloys were oxidized in air for 50 hr at 1000°C. The oxides formed on the alloys were characterized using primarily cross-sectional transmission-electron microscopy techniques along with light microscopy, scanning-electron microscopy, and X-ray diffraction. Although the Al-containing alloys showed comparatively better oxidation behavior, all alloys exhibited "nonprotective" scaling, as suggested by the thick oxides formed. The major component of the outer oxide was NiO. However, modified Y-containing alloys formed protective layers (i.e., α-Cr2O3for NiCrY and αAl2O3 for NiCrAlY) at the scale-alloy interface following the nonprotective scaling. The spoiling resistance of the modified Y-containing alloys was better than their counterpart unmodified Y-free alloys, while their overall oxidation mechanism remained unchanged after Y addition.

KW - NiCr

KW - Oxide

KW - TEM

KW - Yttrium

KW - α-AlO

KW - α-CrO

UR - http://www.scopus.com/inward/record.url?scp=0041703381&partnerID=8YFLogxK

U2 - 10.1023/A:1016060423612

DO - 10.1023/A:1016060423612

M3 - Article

AN - SCOPUS:0041703381

SN - 0030-770X

VL - 58

SP - 41

EP - 56

JO - Oxidation of Metals

JF - Oxidation of Metals

IS - 1-2

ER -

TEM study of scale microstructures formed on Ni-10Cr and Ni-10Cr-5Al alloys with and without Y addition

Abstract

Keywords

ASJC Scopus subject areas

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