On the Role of Yttrium in Alumina Formers: Comparative Oxidation Behavior of (Ni–Cr–Al)- and (Ni–Cr–Al–Y)-Based Alloys

H. M. Tawancy

doi:10.1007/s11085-016-9642-z

On the Role of Yttrium in Alumina Formers: Comparative Oxidation Behavior of (Ni–Cr–Al)- and (Ni–Cr–Al–Y)-Based Alloys

H. M. Tawancy^*

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

It is shown that the addition of Y to an alloy based upon the Ni–Cr–Al system slightly reduces the growth rate of Al₂O₃ scale during isothermal oxidation in air at temperatures in the range of 950–1150 °C. However, Y segregation at grain boundaries of the oxide is found to refine its grain structure down to the nanoscale with improved mechanical strength as compared to the Y-free alloy. It is concluded that Y can have the effect of decelerating the kinetics of diffusion processes leading to grain growth of the oxide.

Original language	English
Pages (from-to)	371-383
Number of pages	13
Journal	Oxidation of Metals
Volume	86
Issue number	3-4
DOIs	https://doi.org/10.1007/s11085-016-9642-z
State	Published - 1 Oct 2016

Bibliographical note

Publisher Copyright:
© 2016, Springer Science+Business Media New York.

Keywords

AlO
Electron microscopy
Ni–Cr–Al system
Segregation
Yttrium

ASJC Scopus subject areas

Metals and Alloys
Inorganic Chemistry
Materials Chemistry

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10.1007/s11085-016-9642-z

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title = "On the Role of Yttrium in Alumina Formers: Comparative Oxidation Behavior of (Ni–Cr–Al)- and (Ni–Cr–Al–Y)-Based Alloys",

abstract = "It is shown that the addition of Y to an alloy based upon the Ni–Cr–Al system slightly reduces the growth rate of Al2O3 scale during isothermal oxidation in air at temperatures in the range of 950–1150 °C. However, Y segregation at grain boundaries of the oxide is found to refine its grain structure down to the nanoscale with improved mechanical strength as compared to the Y-free alloy. It is concluded that Y can have the effect of decelerating the kinetics of diffusion processes leading to grain growth of the oxide.",

keywords = "AlO, Electron microscopy, Ni–Cr–Al system, Segregation, Yttrium",

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T2 - Comparative Oxidation Behavior of (Ni–Cr–Al)- and (Ni–Cr–Al–Y)-Based Alloys

AU - Tawancy, H. M.

PY - 2016/10/1

Y1 - 2016/10/1

N2 - It is shown that the addition of Y to an alloy based upon the Ni–Cr–Al system slightly reduces the growth rate of Al2O3 scale during isothermal oxidation in air at temperatures in the range of 950–1150 °C. However, Y segregation at grain boundaries of the oxide is found to refine its grain structure down to the nanoscale with improved mechanical strength as compared to the Y-free alloy. It is concluded that Y can have the effect of decelerating the kinetics of diffusion processes leading to grain growth of the oxide.

AB - It is shown that the addition of Y to an alloy based upon the Ni–Cr–Al system slightly reduces the growth rate of Al2O3 scale during isothermal oxidation in air at temperatures in the range of 950–1150 °C. However, Y segregation at grain boundaries of the oxide is found to refine its grain structure down to the nanoscale with improved mechanical strength as compared to the Y-free alloy. It is concluded that Y can have the effect of decelerating the kinetics of diffusion processes leading to grain growth of the oxide.

KW - AlO

KW - Electron microscopy

KW - Ni–Cr–Al system

KW - Segregation

KW - Yttrium

UR - https://www.scopus.com/pages/publications/84982166080

U2 - 10.1007/s11085-016-9642-z

DO - 10.1007/s11085-016-9642-z

M3 - Article

AN - SCOPUS:84982166080

SN - 0030-770X

VL - 86

SP - 371

EP - 383

JO - Oxidation of Metals

JF - Oxidation of Metals

IS - 3-4

ER -

On the Role of Yttrium in Alumina Formers: Comparative Oxidation Behavior of (Ni–Cr–Al)- and (Ni–Cr–Al–Y)-Based Alloys

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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