Characterization of thermally cycled alumina scales

B. A. Pint; K. L. More; I. G. Wright; R. F. Tortorelü

doi:10.1179/mht.2000.024

Characterization of thermally cycled alumina scales

B. A. Pint, K. L. More, I. G. Wright, R. F. Tortorelü

Oak Ridge National Laboratory

Research output: Contribution to journal › Conference article › peer-review

36 Scopus citations

Abstract

Cross-sectional transmission electron microscopy was used to characterize the alumina scales formed on several Ni-base alumina-formers. The alumina scale microstructure of Ni-20at%Cr-19Al-0.05Y after 100, l h cycles at 1,100°C was compared to an isothermally-grown scale. Despite being near the onset of mass loss in cyclic testing, very few defects were noted in either scale microstructure. The more adherent scales that form on Hf-doped NiAl and Ni-49at%Al-2Cr were also characterized. With the addition of Cr, the formation of a-Cr precipitates at the metal-oxide interface coincided with increased long-term scale spallation. No similar precipitation mechanism was observed to be associated with scale spallation on NiCrAlY.

Original language	English
Pages (from-to)	165-171
Number of pages	7
Journal	Materials at High Temperatures
Volume	17
Issue number	1
DOIs	https://doi.org/10.1179/mht.2000.024
State	Published - 2000
Event	4th International Conference on the Microscopy of Oxidation - Cambridge, United Kingdom Duration: Sep 20 1999 → Sep 22 1999

Keywords

Alumina scales
Chromium
Nickel

Access to Document

10.1179/mht.2000.024

Cite this

@article{dffd89e039f24d23aab36acde28d9da8,

title = "Characterization of thermally cycled alumina scales",

abstract = "Cross-sectional transmission electron microscopy was used to characterize the alumina scales formed on several Ni-base alumina-formers. The alumina scale microstructure of Ni-20at%Cr-19Al-0.05Y after 100, l h cycles at 1,100°C was compared to an isothermally-grown scale. Despite being near the onset of mass loss in cyclic testing, very few defects were noted in either scale microstructure. The more adherent scales that form on Hf-doped NiAl and Ni-49at%Al-2Cr were also characterized. With the addition of Cr, the formation of a-Cr precipitates at the metal-oxide interface coincided with increased long-term scale spallation. No similar precipitation mechanism was observed to be associated with scale spallation on NiCrAlY.",

keywords = "Alumina scales, Chromium, Nickel",

author = "Pint, {B. A.} and More, {K. L.} and Wright, {I. G.} and Tortorel{\"u}, {R. F.}",

year = "2000",

doi = "10.1179/mht.2000.024",

language = "English",

volume = "17",

pages = "165--171",

journal = "Materials at High Temperatures",

issn = "0960-3409",

publisher = "Taylor and Francis Group",

number = "1",

note = "4th International Conference on the Microscopy of Oxidation ; Conference date: 20-09-1999 Through 22-09-1999",

}

TY - JOUR

T1 - Characterization of thermally cycled alumina scales

AU - Pint, B. A.

AU - More, K. L.

AU - Wright, I. G.

AU - Tortorelü, R. F.

PY - 2000

Y1 - 2000

N2 - Cross-sectional transmission electron microscopy was used to characterize the alumina scales formed on several Ni-base alumina-formers. The alumina scale microstructure of Ni-20at%Cr-19Al-0.05Y after 100, l h cycles at 1,100°C was compared to an isothermally-grown scale. Despite being near the onset of mass loss in cyclic testing, very few defects were noted in either scale microstructure. The more adherent scales that form on Hf-doped NiAl and Ni-49at%Al-2Cr were also characterized. With the addition of Cr, the formation of a-Cr precipitates at the metal-oxide interface coincided with increased long-term scale spallation. No similar precipitation mechanism was observed to be associated with scale spallation on NiCrAlY.

AB - Cross-sectional transmission electron microscopy was used to characterize the alumina scales formed on several Ni-base alumina-formers. The alumina scale microstructure of Ni-20at%Cr-19Al-0.05Y after 100, l h cycles at 1,100°C was compared to an isothermally-grown scale. Despite being near the onset of mass loss in cyclic testing, very few defects were noted in either scale microstructure. The more adherent scales that form on Hf-doped NiAl and Ni-49at%Al-2Cr were also characterized. With the addition of Cr, the formation of a-Cr precipitates at the metal-oxide interface coincided with increased long-term scale spallation. No similar precipitation mechanism was observed to be associated with scale spallation on NiCrAlY.

KW - Alumina scales

KW - Chromium

KW - Nickel

UR - http://www.scopus.com/inward/record.url?scp=0001446846&partnerID=8YFLogxK

U2 - 10.1179/mht.2000.024

DO - 10.1179/mht.2000.024

M3 - Conference article

AN - SCOPUS:0001446846

SN - 0960-3409

VL - 17

SP - 165

EP - 171

JO - Materials at High Temperatures

JF - Materials at High Temperatures

IS - 1

T2 - 4th International Conference on the Microscopy of Oxidation

Y2 - 20 September 1999 through 22 September 1999

ER -

Characterization of thermally cycled alumina scales

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this