A TEM study of the oxide scale development in Ni-Cr-Al alloys

Anwar Ul-Hamid

doi:10.1016/S0010-938X(03)00100-8

A TEM study of the oxide scale development in Ni-Cr-Al alloys

Anwar Ul-Hamid^*

^*Corresponding author for this work

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33 Scopus citations

Abstract

In the present study the isothermal oxidation behaviours of Ni-10Cr-5Al, Ni-20Cr-5Al and Ni-30Cr-5Al alloys were investigated. The alloys were oxidised in air for 50 h at 1000 °C. Analytical transmission electron microscopy was used to characterize the morphology, structure and composition of the oxide scale. The oxide formed adjacent to the alloy was α-Al₂O₃ such that the higher was the Cr content of the alloy the easier was its formation. The Ni-30Cr-5Al alloy formed a complete layer of α-Al₂O₃ in the initial stages of oxidation through 'oxygen gettering' by Cr. A decrease in scale thickness and an increase in scale adherence were observed with an increase in Cr content from 10 to 30 wt.%.

Original language	English
Pages (from-to)	27-36
Number of pages	10
Journal	Corrosion Science
Volume	46
Issue number	1
DOIs	https://doi.org/10.1016/S0010-938X(03)00100-8
State	Published - Jan 2004

Keywords

Microstructure
Ni-Cr-Al
Oxidation
TEM
α-AlO

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

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10.1016/S0010-938X(03)00100-8

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title = "A TEM study of the oxide scale development in Ni-Cr-Al alloys",

abstract = "In the present study the isothermal oxidation behaviours of Ni-10Cr-5Al, Ni-20Cr-5Al and Ni-30Cr-5Al alloys were investigated. The alloys were oxidised in air for 50 h at 1000 °C. Analytical transmission electron microscopy was used to characterize the morphology, structure and composition of the oxide scale. The oxide formed adjacent to the alloy was α-Al2O3 such that the higher was the Cr content of the alloy the easier was its formation. The Ni-30Cr-5Al alloy formed a complete layer of α-Al2O3 in the initial stages of oxidation through 'oxygen gettering' by Cr. A decrease in scale thickness and an increase in scale adherence were observed with an increase in Cr content from 10 to 30 wt.\%.",

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AU - Ul-Hamid, Anwar

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N2 - In the present study the isothermal oxidation behaviours of Ni-10Cr-5Al, Ni-20Cr-5Al and Ni-30Cr-5Al alloys were investigated. The alloys were oxidised in air for 50 h at 1000 °C. Analytical transmission electron microscopy was used to characterize the morphology, structure and composition of the oxide scale. The oxide formed adjacent to the alloy was α-Al2O3 such that the higher was the Cr content of the alloy the easier was its formation. The Ni-30Cr-5Al alloy formed a complete layer of α-Al2O3 in the initial stages of oxidation through 'oxygen gettering' by Cr. A decrease in scale thickness and an increase in scale adherence were observed with an increase in Cr content from 10 to 30 wt.%.

AB - In the present study the isothermal oxidation behaviours of Ni-10Cr-5Al, Ni-20Cr-5Al and Ni-30Cr-5Al alloys were investigated. The alloys were oxidised in air for 50 h at 1000 °C. Analytical transmission electron microscopy was used to characterize the morphology, structure and composition of the oxide scale. The oxide formed adjacent to the alloy was α-Al2O3 such that the higher was the Cr content of the alloy the easier was its formation. The Ni-30Cr-5Al alloy formed a complete layer of α-Al2O3 in the initial stages of oxidation through 'oxygen gettering' by Cr. A decrease in scale thickness and an increase in scale adherence were observed with an increase in Cr content from 10 to 30 wt.%.

KW - Microstructure

KW - Ni-Cr-Al

KW - Oxidation

KW - TEM

KW - α-AlO

UR - https://www.scopus.com/pages/publications/0242381139

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DO - 10.1016/S0010-938X(03)00100-8

M3 - Article

AN - SCOPUS:0242381139

SN - 0010-938X

VL - 46

SP - 27

EP - 36

JO - Corrosion Science

JF - Corrosion Science

IS - 1

ER -

A TEM study of the oxide scale development in Ni-Cr-Al alloys

Abstract

Keywords

ASJC Scopus subject areas

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